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(1) MESSAGE
FROM PRESIDENT
The Joint Assembly in Acapulco (May 22-25) was deemed to be a success in terms of increased participation and numbers of sessions and it is likely that the Joint Assembly will be held in Central and South America fairly frequently in the future.
AGU Council has spent a
considerable
amount of time
recently discussing the kinds of sponsorship which are acceptable and
the
extent to which AGU should acknowledge sponsorship. The specific case
in point
has been Exxon-Mobil¹s sponsorship of a student breakfast at Fall
AGU. Several
Council members wish to reject Exxon-Mobil sponsorship because of the
latter's
support of organisations which could be characterised as ‘anti-climate
change’.
If you have a view on this or any other AGU-related topic, I would be
very
pleased to hear from you. In the meantime, have a good summer.
Bernie Wood, VGP President, bwood@els.mq.edu.au
(i) Bowen
Award
Both awardees will
receive their Awards at the VGP reception
at Fall AGU. As last year, there will
also be a short “Bowen Session” on
the morning of the reception at which the awardees will present some of
the
highlights of their research.
(ii) Short Course at the Geological Society of America Meeting:
A short course on
Geochemical and
Thermodynamic methods of
inferring Paleoelevations, with applications to tectonics, will be held
just
before this year's GSA annual meeting. It's sponsored by the
Mineralogical
Society of America and the Geochemical Society. Information is at:
The short course is
convenient for anyone
attending the
GSA meeting because it will be held the Friday afternoon and Saturday
before
GSA (i.e., October 26 and 27), at one of the GSA hotels in downtown
Abstract submission is
now open.
Deadline: Sept.6,
2007, 2359 UT.
The 2007 Fall Meeting
in
Craig
Manning and Terry Plank, VGP Secretaries
SESSION TITLES: VGP and Union sessions (link to details below)
B16 Geomicrobiology and Environmental Biogeochemistry of Iron and Manganese
B27 Frontiers in Biomineralization Research: Processes, Geochemical Signatures and Responses to Global Change
B35 Environmental, Ecological and Biogeochemical Impacts of Natural and Synthetic Nanomaterials
B42 Isotope Metrology
DI02 Volatiles and Melts in the Earth’s Interior
DI03 The Dynamic Deep Earth: Lower Mantle Heterogeneity, Chemistry, and Flow
DI06 Mantle Phase Transitions and Seismic Discontinuities
DI07 Mechanisms of Deep Earthquakes
DI08 The Equation of State: Theories and Experiments
G02 From microns to meters and milliseconds to days: Towards integration of high-rate GPS measurements and real-time seismic data
GC26 Environmental Monitoring – Luxury or Necessity?
H05 Advances in Sensor Development and Deep Subsurface Monitoring Strategies for Repository Performance Confirmation of Hydrologic Processes and Parameters
HGR13 Interactions Between Fluids and Fractures
IN12 Building Community and Governance within Earth and Space Science Content Models
MR04 Structure and Properties of Silicate Melts
MR06 Frontiers In The Chemistry And Physics Of The Earth’s Mantle
MR07 Multidisciplinary approaches in the study of planetary ices
MR08 Melts in the Deep Interior of the Earth
MR09 Diffusion, defects and transport properties in geomaterials
MR10 Quantification of Rock Fabrics
MR11 Advances in Computational Studies of Earth Materials
MR12 Structures and Properties of Earth’s Interior Probed using Advanced Radiation, Laboratory Tools and Seismic Waves
NS04 Development and Applications of Airborne Methods
OS09 Mountains to ocean deep: Tracking material fluxes and processes during climatic change with new and better proxies
P02 Lava Flows: A solar system perspective
PP03 Deep Time Perspectives on Climate Change: Integrating the Signal from Models and Biological Proxies
PP12 Evolution of Ocean Chemistry: From The Rise of Oxygen to Contemporary Weathering Processes
T02 Batholiths on the Leading Edge of the Cordillera: Crustal Growth, Recycling and Focused Deformation in Continental Arcs
T04 Behavior of Mid-Ocean Ridge Axis Offsets: Tectonic and Magmatic Segmentation Along Spreading Ridges
T05 Inner Workings of Centam and IBM Subduction Factories
T06 Tectonic, Magmatic and Surface Processes in Arc-Continent Collisions
T08 Tectonic Erosion, Sediment Accretion and Mass Recycling in Subduction Zones
T10 Mantle Exhumation at Rifted Continental Margins: Magmatic and Tectonic Processes
T13
From the Trench to the Arc:
Subduction along
T14 Bringing together observations and models at rifted margins and extensional basins
T16 The Mesozoic Pacific: Plate Tectonics, Volcanism, Paleoceanography, and the Geomagnetic Field
T19 The Generation Of Oceanic Lithospheric In Areas Of Low Effusive Magmatism – Where Has All The Crust Gone?
T20 Surface Processes, Crustal Rheology, or Regional Geology: What Controls the Structural Architecture of Convergent Continental Orogens?
T21 Understanding the Earth’s Deep Lithosphere
T26 Continental Collision – the Lithospheric Scale
T27 The Effect of Lithospheric Elements on Mantle Processes
T29 Caribbean Subduction Zones – Past and Present
T31
Foundering lithosphere:
Observations and implications, with a focus on the
T35 New Perspectives On Crustal Heat Generation And Lithospheric Thickness In Precambrian Terrains
T41 Circum-Arctic Tectonic Evolution
DETAILS of VGP and Union sessions:
V01
Volcanology General Contributions
This session provides the opportunity for contributions that fall
within the
broad spectrum of Volcanology, but are not directly appropriate to any
of the
other Special Sessions proposed for the Volcanology, Geochemistry, and
Petrology Section.
Conveners:
Terry Plank, Dept. of
Earth Sciences, Boston University, 685 Commonwealth Avenue, Boston, MA
02215
USA, Tel: 1 617 353 4213, Fax: 1 617 353 3290, email: tplank@bu.edu,
and
Craig
Manning, Dept. of Earth and Space Sciences, UCLA, , Los Angeles,
CA
90095 USA,
Tel: 1 310 206 3290, Fax: 1 310 825 2779, email: manning@ess.ucla.edu,
and
Katherine A. Kelley, Graduate School of Oceanography, University
of
Rhode
Island, Narragansett Bay Campus, Narragansett, RI 02882 USA, Tel: 1 401
874
6838, email: kelley@gso.uri.edu
(back)
V02
Geochemistry and
Petrology General Contributions
This session provides the opportunity for contributions that fall
within the
broad spectrum of Geochemistry and Petrology, but are not directly
appropriate
to any of the other Special Sessions proposed for the Volcanology,
Geochemistry, and Petrology Section.
Conveners:
Terry Plank, Boston
University, 685 Commonwealth Avenue, Boston, MA 02215 USA, Tel: 617 353
4213,
Fax: 617 353 3290, email: tplank@bu.edu, and
Craig Manning, University
of
California, Los Angeles, , Los Angeles, CA 90095-1567 USA, Tel: 310 206
3290,
Fax: 310 825 2779, email: manning@ess.ucla.edu, and
Katherine A.
Kelley,
University of Rhode Island, Narragansett Bay Campus, Narragansett, RI
02882
USA, Tel: 401 874 6838, email: kelley@gso.uri.edu
(back)
V03
Subduction
Volcanism at Continental Margins
This session focuses on volcanism at the edge of continents, as
exemplified
(but not exclusively) by the Mexican volcanic belt. Mass flow in
subduction
environments from the mantle to the surface is influenced by
differentiation
processes, crustal contamination, degassing, magma ascent rates and
eruption
type. Presentations are invited on volcanic products ranging from
volcanic
rocks, melt inclusions in crystals, and gases to xenoliths that provide
insight
into the origin, evolution and transport processes of such continental
arc
magmas. Fundamental topics to be addressed include the role of
subduction
volcanism in the formation of the continents, estimates on the amount
of
crustal contamination in a volcanic suite, the composition of the
mantle wedge
at continental margins, the volatile budget in specific subduction
zones, and
the application of the stratigraphic and petrologic history of a
volcano to
better predict future eruptions. We invite contributions thematically
linked
and/or inspired by the lasting and fundamental work of James F. Luhr.
Conveners:
Anne Helene Peslier,
University of Houston, Texas Center for Superconductivity (TcSUH) 202
HSC
Building, Houston, TX 77204 USA, Tel: 713-743-8283, Fax: 713-743-4004,
email:
apeslier@mail.uh.edu, and
Johan (Joop) C Varekamp, Wesleyan University,
Earth
& Environmental Sciences 265 Church Street, Middletown, CT 06459
USA, Tel:
860-685-2248, email: jvarekamp@wesleyan.edu, and
Lee Siebert,
Smithsonian
Institution, Global Volcanism Program National Museum of Natural
History,
Washington, DC 20560 USA, Tel: 202-633-1818, email:
siebertl@si.edu
(back)
V04 Linking
Precise
Dates to Accurate Ages in Continental Tectonics
Our understanding of continental tectonics is fundamentally linked to
our
ability to precisely and accurately date geologic events and processes.
As
geochronological methods become more precise, it is increasingly
important to
ask: “What are we dating?” A geochronometer or thermochronometer
“dates” only
part of an event or cycle, particularly in regions of continental crust
that
record protracted or multiple episodes of deposition, burial, pluton
emplacement, metamorphism, deformation, fluid flow, and/or exhumation.
Although
improved precision allows tectonic histories to be unravelled with
unprecedented resolution, it requires a comprehensive understanding of
the
reactions and processes responsible for growth, dissolution,
reprecipitation,
and alteration of minerals, such as zircon, monazite, xenotime,
titanite,
rutile, apatite, hornblende, and muscovite. We invite contributions
that seek
to establish direct links between specific reactions/processes and the
ages of
high- to low-T geochronometers and thermochronometers. We especially
encourage
contributions from studies of natural or experimental systems that use
emerging
techniques to constrain temporal aspects of continental tectonics, or
present
innovative approaches and interpretations of accessory mineral
chronology.
Conveners:
Gregory Dumond,
University of Massachusetts-Amherst, Department of Geosciences
University of
Massachusetts-Amherst 611 North Pleasant Street, Amherst, MA 01003 USA,
Tel:
413-545-0175, Fax: 413-545-1200, email: gdumond@geo.umass.edu, and
Rebecca M.
Flowers, University of Colorado at Boulder, Dept. of Geological
Sciences
University of Colorado at Boulder, Boulder, CO 80309 USA, email:
rflowers@gps.caltech.edu,
and
Kevin H. Mahan, University of Colorado at Boulder, Dept. of
Geological
Sciences University of Colorado at Boulder, Boulder, CO 80309 USA,
email:
kmahan@gps.caltech.edu
(back)
V05
Experiments and
Fluids: From the
Our understanding of the key role played by the chemistry of fluids and
volatile-bearing solid phases in hydrothermal, metamorphic and magmatic
processes can be improved significantly by novel and careful laboratory
experimentation. Such experiments of the type developed and applied
broadly by
John Holloway provide critical (and supercritical) insights into phase
and
molecular stabilities, fluid compositions and thermodynamic properties,
volatile solubilities, elemental partitioning and petrogenesis over a
wide
range of physical conditions from ocean-floor hydrothermal systems to
planetary
mantles. This session invites diverse contributions thematically linked
to the
role of fluids and volatile components in Earth processes, including
the
synthetic organic geochemistry of submarine hydrothermal systems,
magmatic
volatile solubility and behavior including volcanic degassing, the
interplay
between volatile element chemistry and planetary redox state,
dehydration
reactions and volatile cycling in subduction zones and crustal melting,
high
pressure materials geochemistry, and mantle petrogenesis involving
volatiles.
Also invited are novel experimental approaches to understanding
volatile-bearing systems at elevated temperature or pressure.
Conveners:
Gordon Moore,
David Bell, Arizona State University, Dept.
of
Chemistry and Biochemistry,
V06 A
Retrospective
and Prospective Look at the Geology, Petrology, Geochemistry and
Tectonics of
Ultrahigh Pressure Metamorphic Rocks
The session will focus on progress in the field of ultrahigh-pressure
metamorphism (UHPM) in the last 20 years, and where it is projected to
be 20
years from now. We welcome presentations related to multidisciplinary
studies
of natural UHPM rocks using innovative instruments and technologies,
experiments related to UHP mineral/rock synthesis and numerical
modeling, which
together will provide better insights into deep subduction of
continental
materials and their interactions with mantle constituents. Observations
on
mantle xenoliths and inclusions in kimberlitic diamonds are also
welcome.
Conveners:
Larissa Dobrzhintskaya,
University of California at Riverside, Riverside, CA 92521 USA, Tel:
951-827-2028, email: Larissa@ucr.edu, and
Hans-Peter Schertl, Institute
of
Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Bochum,
44780 DEU,
Tel: 49(0)234/32-23520, email: hans-peter.schertl@rub.de, and
Jingsui
Yang,
Institute of Geology, Chinese Academy of Geological Sciences, 26
Baiwanzhuang
Road, Beijing, 100037 CHN, Tel: 86-10-68994782, email:
yangjsui@ccsd.org.cn
(back)
V07 Magma
Fracture in
Lava Domes and Conduits
The fracture of silicic magma plays a key role in controlling conduit
dynamics,
eruption styles and the growth, deformation and stability of lava
domes. In
this session, we hope to draw together field observations and
measurements,
laboratory experiments, and modeling studies to improve understanding
of how
fracturing influences conduit processes and lava dome emplacement.
Submissions
may include models of conduit dynamics and lava dome growth that
consider the
effects of strain localisation and fracturing. Studies linking
geophysical data
such as seismicity and edifice deformation to magma fracture are also
welcome,
as are analyses of the geological signature of fracturing in silicic
magma,
such as gouge zones and tuffisite veins. We also encourage presentation
of
experimental work that addresses the fracture mechanics and
fragmentation of
magma, particularly at temperatures close to the brittle ductile
transition.
Conveners:
Rosanna Smith, UCL,
Department of Earth Sciences, UCL, Gower Street, London, WC1E 6BT GBR,
Tel:
+44(0)2076792400, Fax: +44(0)2076792390, email:
rosanna.smith@ucl.ac.uk, and
John S. Pallister, CVO, USGS, Cascades Volcano Observatory 1300
SE
Cardinal
Court, Suite 100, Vancouver, WA 98683-9589 USA, Tel: 360-993-8964,
email:
jpallist@usgs.gov, and
Peter R Sammonds, UCL, Department of Earth
Sciences,
UCL, Gower Street, London, WC1E 6BT GBR, Tel: +44(0)2076792422, email:
p.sammonds@ucl.ac.uk
(back)
V08
Experiments in
Geoscience: Challenges and Future Directions
Experimental studies are fundamental to advancing our understanding of
geologic
processes. For example, the construction of PTt paths, modeling
volcanic
discharge, predicting ore metal anomalies, element and isotope
fractionation
during melting and degassing, the fate of subducted slabs and the
storage of
nuclear waste in analogs of geologic materials are examples of research
initiatives which could not be pursued in the absence of experimental
data.
While experimental data now facilitate a wealth of geochemical
interpretation,
there are significant challenges that face the experimental community.
Among
them: the interpretation of metal solubility data in light of the
melt-nugget
issue, the ability to equilibrate and trap complex multi-phase fluids,
constraining gas fugacities in diamond anvil experiments and scaling
issues.
This session aims to bring together experimentalists working on the
partitioning of elements in melt – crystal systems, the role of
immiscible
silicate – sulfide melts, diffusion in magmatic systems, element
speciation in
melts and fluids, and other relevant issues all of which aim to improve
our
understanding of natural systems. We also encourage contributions
involving
novel analytical techniques which are routinely fundamental to
experimental
advances.
Conveners:
John Mavrogenes,
Adam
Simon,
V09
Frontiers in
Isotope Fractionation in Geomaterials: Theory and Experiments
Recent advances in mass spectrometry allow study of a wider range of
isotopic
systems on ever smaller samples with increasing accuracy. These
technical
improvements lead to new isotopic insights into the Earth and the Solar
system.
Contributions of high temperature processes, diffusion and
mass-independent
isotope fractionation cannot be neglected any longer. Because smaller
samples
can be analyzed with remarkable accuracy, it is also now possible to
experimentally study isotopic fractionation at extreme conditions, such
as at
high pressure or in mineral nanocrystals. In addition, improvements in
empirical and ab initio atomistic modeling allow us to decipher subtle
effects
of mass differences on the dynamic and thermodynamic properties of
solid and
fluid materials. This session aims to bring together a wide range of
scientists
with interests in the study of isotopes in geomaterials. Geoscientists
from,
but not restricted to, experimental and theoretical mineral physics and
geochemistry, field geology and computational physics, geochronology,
volcanology and cosmochemistry, environmental sciences and planetology
are
invited to participate. The session will address the latest issues
related but
not limited to stable and radiogenic isotopes, to pressure and
temperature
effects, diffusion, mass-independent fractionation and electronic
effects.
Conveners:
Mathieu Roskosz, LSPES
Université de Lille1, Bâtiment C6 USTL, villeneuve d'Ascq,
59655 FRA, Tel: +33
(0)3 20 33 64 16, Fax: +33 (0)3 20 43 65 91, email:
mathieu.roskosz@univ-lille1.fr, and
Razvan Caracas, Bayerisches
Geoinstitut,
University of Bayreuth, Universitaetstrasse 30, Bayreuth, D-95447 DEU,
Tel: ++49-(0)921-553739,
Fax: ++49-(0)921-553769, email:
razvan.caracas@uni-bayreuth.de
(back)
V10 From
the Arc to
the Back-Arc: Linking Geochemical and Geophysical Observations with
Geodynamic
Models of the Mantle Wedge
Back-arc basins (BABs) are complex tectonic environments in which
oceanic crust
is created at a spreading center (back-arc spreading center, BASC) in
close
proximity to a subduction zone. This juxtaposition results in strong
spatial
gradients in both geochemical and geophysical observables, providing a
unique
window on geodynamic and petrogenetic processes in the upper mantle.
This
session seeks to highlight progress in our understanding of mantle flow
and
melting in the mantle wedge by considering differences between arcs and
BASCs,
as well as between BASCs and normal mid-ocean ridges. Questions of
interest
include: What is the nature of the slab-derived component that
contributes to
arc and BASC magmatism (e.g., hydrous fluids, melts)? What is the
distribution
of this component within the wedge, and by what mechanism is it
transported?
What constraints do seismic attenuation and velocity studies provide
regarding
the presence of water, melt and fine-scale structure in the mantle
wedge
beneath BABs? How does plate kinematics (e.g., subduction angle,
subduction
rate, arc-back-arc separation, back-arc spreading rate) affect mantle
flow and
melting in arcs and BASCs? Contributions from geochemistry, petrology,
seismology, geophysics, geodynamics and mineral physics are encouraged,
as are
contributions from researchers working in relevant Ridge and Margins
focus
sites (e.g.,
Conveners:
Paul Hall, Boston
University, 675 Commonwealth Ave, Boston, MA 02215 USA, Tel:
617.353.9678, Fax:
617.353.3290, email: phall@bu.edu, and
Stephane Escrig, Harvard
University, 20
Oxford Street, Cambridge, MA 02138 USA, Tel: 617.496.6983, Fax:
617.496.6958,
email: escrig@eps.harvard.edu
(back)
V11
Recycling of Deep
Continental Lithosphere: Consequences for the Mantle and Crust
Recycling of eclogite/pyroxenite of oceanic crust and lower continental
crust
origins, together with the underlying lithospheric mantle (deep
lithosphere),
has been proposed to play a key role in plate tectonics, plume
magmatism,
crustal evolution and formation of chemical heterogeneities within the
mantle.
Although lithospheric recycling has been extensively studied in the
oceanic
case, direct evidence for recycling of the deep continental lithosphere
into
the mantle is scarce. Recent geochemical and geophysical evidence
suggests that
this process may occur via foundering of dense, eclogitic material
produced
during continental orogenesis and/or delamination of the base of the
crust and
during deep continental crust subduction. Important questions in this
context
are: What are the chemical and physical consequences of this process?
What are
the geological, geochemical and geophysical responses of it? How do the
density, thermal and rheologic and other factors control the space and
time
scales of this process? Was this process also important in the Archean
era?
These will be among the issues to be discussed in this symposium. In
addition,
we invite a broad range of contributions on the subject of continent
subduction
and the interaction of the continental crust with the mantle.
Conveners:
Roberta L Rudnick,
University of Maryland, Geochemistry Laboratory Dept. Geology, College
Park, MD
20742 USA, Tel: 301 405 1311, email: rudnick@geol.umd.edu, and Shan
Gao,
Chinese University of Geosciences, Department of Geochemistry, Wuhan,
430074
CHN, Tel: 86 27 87482737, Fax: 86 27 87436107, email:
sgao1962@vip.sina.com,
and
Adrian Lenardic, Rice University, Dept. Earth Sciences, Houston,
TX
77005
USA, Tel: (713) 348-4883, email: ajns@rice.edu, and
Rixiang Zhu,
Chinese
Academy of Sciences, Institute of Geology and Geophysics, Beijing,
100029 CHN,
Tel: 86-10-62007912, email: rxzhu@mail.igcas.ac.cn
(back)
V12
Spreading Ridge
Interactions with Hotspots, Subduction Zones, and Transforms
This session will focus on the magmatic, geochemical, and tectonic
phenomena
that occur where active spreading ridges (mid-ocean ridges, back-arc
spreading
centers) interact with hotspots, subduction zones, and transform
faults.
Spreading ridges influence and are influenced by interactions with
other plate
boundaries or hotspots. The complex and dynamic interactions include
unusual
volumes, locations, and styles of magmatism, mixing of magmas and
sources
between the different regimes, and complex tectonic effects.
Geochemical
tracers and enhanced magmatic volumes typical of hotspots can be found
along
ridges tens or hundreds of kilometers from the interacting hotspot.
Subduction
of an active ridge can create slab windows beneath the overriding plate
leading
to forearc volcanism near the triple junction, and arc-affinity lavas
have been
found along near-trench mid-ocean ridges. The proximity of a ridge to a
major
transform can dramatically alter the volume and geochemical
characteristics of
ridge magmas including the generation of silicic lavas or enriched MORB
at
ridge-transform intersections. We invite contributions from all areas
of
research aimed at a better understanding of the effects of interactions
between
spreading ridge systems and other major tectonic features.
Conveners:
John Chadwick, University
of North Carolina, Charlotte, Charlotte, NC 28223 USA, Tel:
704-687-5947,
email: djchadwi@uncc.edu, and
Mike Perfit, University of Florida,
Gainesville,
FL 32601 USA, Tel: 352-392-2128, email: perfit@geology.ufl.edu, and
Randy
Keller, Oregon State University, Corvallis, OR 97331 USA, Tel:
541-737-7648,
email: kellerr@geo.oregonstate.edu
(back)
V13
Changing Views on
the Earth's Mantle
Through multi-disciplinary, collaborative research, the last decades
have seen
major advances in observations and knowledge of the Earth's mantle.
This
session aims at bringing together the mantle scientific community of
geochemists, geodynamicists, seismologists and mineral physicists to
highlight
recent insights and discoveries about the volumes of various mantle
reservoirs
(upper mantle, lower mantle, D", etc.), the extent of their
interactions,
the scale of mantle convection and the role of compositional and
mineralogical
variations. The session will provide a platform for integrating recent
results
into a process-oriented and observation-based model of the mantle.
Conveners:
Dominique Weis,
University of British Columbia, Earth and Ocean Sciences 6339 Stores
Road,
Vancouver, BC V6T1Z4 CAN, Tel: 16048221697, Fax: 16048226088, email:
dweis@eos.ubc.ca, and
Rob D van der Hilst, Massachusetts Institution of
Technology, Earth, Atmospheric and Planetary Sciences 77 Massachusetts
Avenue,
Room 54-522, Cambridge, MA 02139 USA, Tel: 16172536977, Fax:
16172589697,
email: hilst@MIT.EDU, and
William M White, Cornell University, Earth
&
Atmospheric Sciences Snee Hall, Ithaca, NY 14853 USA, Tel: 16072557466,
email:
white@geology.cornell.edu
(back)
V14
Saucer-Shaped
Sills, Injected Sands and Related Structures: Formation Mechanisms,
Examples,
and Extra-Terrestrial Analogues
Magma and fluidized sand can develop bowl- or saucer-shaped structures
that are
increasingly recognized by field observations and by detailed seismic
imaging
in petroleum provinces (
Conveners:
Stephane Polteau, Physics
of Geological Processes, Faculty of Mathematics and Natural Sciences,
University
of Oslo, PO BOX1048, Blindern, Oslo, N-01316 NOR, Tel: +47 22856446,
Fax: +47
22855101, email: polteau@fys.uio.no, and
Joe A. Cartwright, 3DLab,
School of
Earth, Ocean and Planetary Sciences, Cardiff University, Main Building,
Park
Place, Cardiff CF10 3YE, Wales, UK., Cardiff, CF310 3YE GBR, email:
joe@ocean.cf.ac.uk, and
Richard E. Ernst, Ernst Geosciences, 43
Margrave
Avenue, Ottawa, ON, Canada K1T 3Y2, and Dept. of Earth Sciences,
Carleton
University, Ottawa, ON, Canada K1S 5B6, ON CAN, Tel: 1 613 733 0887,
email: Richard.Ernst@ErnstGeosciences.com
(back)
V15
Volcano-Pluton
Connections
The recognition that some upper crustal plutons are assembled
incrementally
over timescales that are comparable to the lifetimes of individual
volcanic
centers has reignited debate about connections between the volcanic and
plutonic records. Are plutons being assembled under active volcanoes?
Or is
there a disconnect in space and time between plutonism and volcanism?
Do some
plutonic rocks represent the unerupted crystal residue of magmas that
fed
successive volcanic eruptions, and thus are complementary to coeval
volcanic
deposits? Do other plutons provide samples of the magmas that feed
volcanoes,
and thus, are texturally modified equivalents of coeval volcanic rocks?
Do shallow
plutons at crustal levels of volcanic deposits record briefer and
simpler
assembly and consolidation histories than deeper larger intrusions that
may be
the composite homogenized products of multiple successive eruptive
events? In
this session, we will explore the similarities and differences in the
temporal,
petrologic, and chemical records of magmatism preserved in volcanic and
plutonic rocks.
Conveners:
Drew S Coleman,
University of North Carolina, Department of Geological Sciences
CB#3315, Chapel
Hill, NC 27599-3315 USA, Tel: 919 962-0705, Fax: 919 966-4519, email:
dcoleman@unc.edu, and
Peter W Lipman, US Geological Survey, MS910 345
Middlefield Rd, Menlo Park, CA 94025 USA, Tel: 650-854-9199, email:
plipman@usgs.gov
(back)
V16
Geoscience
Research For Geothermal Energy Utilization: Case Studies From Coso And
Other
Geothermal Fields
Geothermal exploration and development is by necessity a
multidisciplinary
effort. At the Coso geothermal field in eastern
Conveners:
Allen Glazner,
Jeffrey Unruh, William Lettis & Associates,
Inc.,
Egill Hauksson, California Institute of
Technology, Seismological Laboratory MS 252-21,
V17
Weathering
Processes Across Natural Landscape Gradients: New Isotopic and
Geochemical
Approaches
Natural environmental gradients can provide critical insights regarding
physical and chemical weathering processes. These processes are often
revealed
by examining isotopic and geochemical trends at related sites that vary
in
climate, landform age, erosion rates, atmospheric deposition, or
hydrologic
regime (e.g. permafrost thaw or clay accumulation). We invite
contributions
that focus on new categories of environmental gradients, and
contributions that
highlight new isotopic approaches (stable, cosmogenic or radiogenic) to
advance
our understanding of the physical, geochemical and biogeochemical
evolution of
landscapes across different types of natural gradients.
Conveners:
Kate Maher, US Geological
Survey, 345 Middlefield Rd MS 73, Menlo Park, CA 94301 USA, Tel:
(650)329-4978,
email: kmaher@usgs.gov, and
Stephanie Ewing, U.C. Berkeley, Center for
Isotope
Geochemistry, Department of Earth & Planetary Science 301 McCone
Hall,
Berkeley, CA 94704 USA, Tel: (510)643-5063, email:
saewing@nature.berkeley.edu
(back)
V18
Mineral-Water
Interface Geochemistry and Applications to the Reactivity and Transport
of
Environmental Nanoparticles
Decades of intensive spectroscopic and microscopic investigation
combined with
chemical modeling of the solid-water interface have provided a wealth
of detailed
information about the rates and mechanisms of reactions between solutes
and
mineral surfaces. Recent scientific interest in the reactivity and
environmental behavior of both natural and synthetic nanoparticles has
provided
a new focus area for fundamental studies of the solid-water interface.
This
session occupies an interdisciplinary realm spanning geochemistry,
hydrology,
mineralogy, spectroscopy, environmental chemistry, and nanoscience. We
seek
contributions from investigators presenting (i) studies of the
structure and
reactivity of the solid-water interface, especially relating to the
emerging
interest in nanoparticle reactivity and mobility, (ii) results from the
application of spectroscopic and microscopic tools to particle-water
and single
crystal surface-water interfaces, and (iii) investigations with
implications
for the potential use of ‘engineered’ nanoparticles for environmental
remediation.
Conveners:
Bruce A. Manning, San
Francisco State University, Department of Chemistry & Biochemistry
1600
Holloway Ave., San Francisco, CA 94132 USA, Tel: 415-338-1292, email:
bmanning@sfsu.edu, and
William H. Casey, University of California,
Davis,
Department of Chemistry One Shields Avenue, Davis, CA 95616 USA, Tel:
530-752-3211, email: whcasey@ucdavis.edu
(back)
V19
Dynamics of Gas
Transport in Magma
Emission of juvenile gases is a feature of
active
volcanoes both during eruption, and during periods of quiescence. Gas
transport
is driven by buoyancy and may be facilitated by the rise, growth, and
coalescence of bubbles, by the flow of gas through bubble and/or
fracture
pathways which permeate the magma, or by some dynamic combination of
the two.
The nature of the journey that the gas takes, from exsolution to
emission,
exerts a fundamental control on the observed eruptive behaviour.
Submissions
are sought which consider any aspect of the transport of gas through
magma and
the volcanic system in general. Experimental, numerical, or theoretical
treatments of the development of permeability in magma are particularly
welcome
as are studies which link the mechanism of gas transport to eruptive
style.
Priority will also be given to research which exploits field
observations and
measurements of surface gas emissions to elucidate subsurface gas
transport
processes
Conveners:
Edward W Llewellin,
University of Durham, Department of Earth Sciences, Durham University,
Science
Labs, Durham, DH1 3LE GBR, Tel: +44 (0) 191 33 42336, email:
ed.llewellin@durham.ac.uk, and
Martin O Saar, University of Minnesota,
Department of Geology and Geophysics 310 Pillsbury Drive SE,
Minneapolis, MN
55455 USA, Tel: 612-625-7332, Fax: 612-625-3819, email: saar@umn.edu,
and
Oliver Spieler, University of Munich, DEU, email:
ospieler@web.de, and
Helge
Gonnermann, University of Hawaii, Honolulu, HI 96822 USA, Tel:
808 956
5036,
email: helge@hawaii.edu
(back)
V20 Hotspot
Anomalies
and Upper Mantle Processes: Insights from Observations and Modeling
Anomalies found in hotspot regions offer clues to the dynamic evolution
of the
upper mantle and lithosphere in these areas. Many processes are
important to
creating these anomalies, such as mantle melting, melt transport,
upwelling of
mantle material, and physical and thermal interactions with the
lithosphere.
Observations include seismic velocity anomalies, excess volcanism both
on and
off-axis, changes in mid-ocean ridge axis morphology and location,
gravity
anomalies and a range of anomalous geochemical data. Studies ranging
from
petrologic experimentation to fluid dynamical computation have often
invoked
the mantle-plume hypothesis, but the details of how plume-lithosphere
dynamics
and plume chemistry are manifest in hotspot anomalies are still being
explored.
This session strives to bring together evidence from observations of
hotspot
anomalies and modeling to provide a clearer picture of the dynamics of
hotspot
affected regions, and to help illustrate the strengths and weaknesses
in
hotspot theories across a variety of disciplines.
Conveners:
Todd Anthony Bianco,
SOEST,
Eric Mittelstaedt, SOEST,
Peter Van Keken,
V21 The
Origin and
Evolution of Continents: Lithospheric and Asthenospheric Perspectives
Whereas there has been much debate over the origin of the continental
crust,
constraining the formation and evolution of the underlying continental
lithospheric mantle is also important, as it is the link between
surface
observations and deep mantle processes, both in the present and in the
past.
This session will focus on the lithospheric mantle beneath continents:
how it
forms and evolves, how it relates to crust formation, how it interacts
with the
asthenosphere and how it is affected by plumes. Key questions include:
what can
petrology, geochemistry, and geodynamic models tell us about
lithosphere
formation and stabilization in the present and in the deep past? What
hypotheses
can now be ruled out by existing data? What are the geologic, dynamic
and
geochemical consequences of lithosphere-asthenosphere interaction? What
are the
influences of melting, melt transport, and melt-rock reaction on the
thermal
state and rheology of the deep lithosphere? In what novel ways can we
use
petrogenetic processes to determine continental dynamics, past and
present? We
invite contributions in the areas of (but not limited to) petrology and
geochemistry of xenoliths and mantle-derived magmas, geodynamic
modeling,
gravity and heat flow studies, rheology of the lithospheric mantle, and
seismic
studies of the lithosphere, asthenosphere, and even the uppermost part
of the
transition zone. Case studies in cratons or tectonically active areas
are also
welcome.
Conveners:
Madalyn Blondes,
Catherine Cooper, Carnegie
Institute of
Jessica
Warren, Woods Hole Oceanographic Institution,
Cin-Ty Lee,
V22
Yellowstone
Volcano Dynamics: Contemporary Measurements and Studies Of Active
Magmatic and
Tectonic Sources
Recent observations of the
Conveners:
Jacob B Lowenstern, U.S.
Geological Survey, VHZ, MS 910 345 Middlefield Road, Menlo Park, CA
94025 USA,
Tel: 650-329-5238, Fax: 650-329-5203, email: jlwnstrn@usgs.gov, and
Robert B
Smith, University of Utah, Department of Geology and Geophysics
135
South 1460
East Room 702, Salt Lake City, UT 84112 USA, Tel: 801-581-7129, email:
rbsmith@mines.utah.edu, and
Henry Heasler, Yellowstone National Park,
Yellowstone Center for Resources P.O. Box 168, Bldg. 27, Mammoth, WY
82190 USA,
Tel: 307-344-2441, email: Henry_Heasler@nps.gov
(back)
V23
Physical and
Chemical Processes in Mafic Layered Intrusions
Mafic layered intrusions are a keystone in our understanding of many
magmatic
systems. Their geodynamic significance is considerable because they
represent
one fundamental mode of magma transfer from the upper mantle to the
crust. They
have occurred through geologic times from the Archean (e.g., Stillwater
Complex) to the Tertiary (e.g., Skaergaard Complex) on all five
continents.
Some of them are related to Large Igneous Provinces and many are host
to
sizeable economic deposits (PGE, chromium, vanadium, nickel). This
session will
gather recent advances in the geochemistry, petrology and physics of
mafic
layered intrusions. We encourage presentations of multidisciplinary and
innovative approaches from specialists in all disciplines.
Conveners:
Eric C. Ferré, Southern
Illinois University, Carbondale, Department of Geology Southern
Illinois
University, Carbondale, IL 62901 USA, Tel: 618-453-7368, Fax:
618-453-7393,
email: eferre@geo.siu.edu, and
Bruce D. Marsh, Johns Hopkins
University,
Department of Earth & Planetary Sciences Johns Hopkins University,
Baltimore, MD 21218 USA, Tel: 410-516-4652, email:
bmarsh@jhu.edu
(back)
V24
Magmatic
Processes in Arcs and Metallogeny
This session will focus on the interaction of physical and chemical
processes
during magmatic evolution in island and continental arcs, and how these
affect
the genesis of ore deposits related to felsic magmas. The session aims
to address
formation of the massive metal and sulfur anomalies that characterize
these
deposits by taking a broad view of the magmatic system, including
processes in
the magma sources and the deeper part of the system. We welcome
contributions
from igneous petrologists, economic geologists, numerical modelers,
geochemists
and geophysicists describing any aspect of these magmatic systems.
Studies
based on field, experiments or theoretical approaches are invited.
Conveners:
Roberto F Weinberg,
School of Geosciences, Monash University, Clayton, VIC VIC 3800 AUS,
Tel: 61 3
99054902, Fax: 61 3 99054903, email:
Roberto.Weinberg@sci.monash.edu.au, and
Andy Tomkins, School of Geosciences, Monash University, Clayton,
VIC
VIC 3800
AUS, Tel: 61 99054901, Fax: 61 99054903, email:
Andy.Tomkins@sci.monash.edu.au
(back)
V25
High-Pressure
Metamorphism in Southeastern Europe
New age determinations on metamorphic rocks of the Balkan region and
the
Carpathian arc show that the crystalline fragments outcropping in SE
Europe can
be significantly different in age, such that they record orogenic
processes
ranging from Pan-African to Alpine times. Associated high-pressure
rocks
indicate that it is likely that the last 600 million years has seen
multiple
continent-continent collision events. Existing data indicate a complex
evolution involving various plate-margin interactions,
subduction-collision
episodes and terrane amalgamations. The information can be fully
utilized only
by combining results from metamorphic petrology, geochronology,
paleomagnetic
and other investigations. This session will bring together
contributions from
all these disciplines to give new insight into this complex collage of
crystalline complexes in
Conveners:
Gavril Sabau, Geological
Institute of
Hans-Joachim Massonne, Institut
fuer
Mineralogie und Kristallchemie, Universitaet Stuttgart, Azenbergstr.
18,
V26 Mud
Volcanoes and
Their Eruption Dynamics
It is commonly agreed that the main engine driving mud volcanism is the
overpressure from methane-rich fluids linked with hydrocarbon formation
at
greater depth. However, recent models focus on alternative mechanisms
such as
dewatering of thick clay-rich sedimentary units, high temperature
gradients
triggering geochemical reactions at shallow depth, and rise of
supercritical
fluids from great depths. Offshore mud volcanoes are frequently
associated with
the presence of gas hydrates. Gas hydrate dissociation may be coupled
with the
mud volcano eruptions or feed seepage sites associated with
precipitation of
methanogenic carbonate. The search for mud volcanoes on other planets
(e.g.
Mars) represents a new approach to identify the presence of water and
hydrocarbons and thus the exploration for extraterrestrial life. This
session
aims to bridge the gap between studies of onshore and offshore mud
volcanoes.
We welcome contributions on eruption dynamics, long-term monitoring,
numerical
modeling, fluid geochemistry and plumbing systems.
Conveners:
Adriano Mazzini, PGP,
University of Oslo, Department of Physiscs, Sem Saelandsvei 24,
Blindern, Oslo,
0316 NOR, Tel: +47 228 56108, Fax: +47 228 55101, email:
adriano.mazzini@fys.uio.no, and
Sverre Planke, Volcanic Basin Petroleum
Research, Oslo Innovation Park, Oslo, 0349 NOR, email: planke@vbpr.no,
and
Grigorii Akhmanov, Moscow State University, Department of
Petroleum
Geology
Vorobjevy Gory, Moscow, 119991 RUS, email: akhmanov@geol.msu.ru, and
Christian
Berndt, Southampton Oceanography Centre, University Road,
Southampton,
SO17 1BJ
GBR, email: cbe@soc.soton.ac.uk
(back)
V27
Tracking Magma
Movement and Storage in Basaltic Edifices: From Models to Field
Observations
Recent data indicate that large volumes of magma in basaltic systems
may be
injected into an edifice from a shallow reservoir without being easily
detected
by any geophysical sensors. A fraction of the magma does not erupt, but
has
large effects on fluid pressures and local stresses inside the edifice.
Lack of
knowledge of the stored magma volume and movement limits our ability to
develop
realistic numerical models that can be applied to real basaltic
systems. The
finding of geophysically invisible intrusions suggests the need for an
interdisciplinary approach, using geophysical, geochemical, and
geological
models and datasets collected on active volcanoes worldwide, to address
the
problems of magma storage and movement within large edifices. The main
goals of
this session are 1) to test the ideas suggesting large magma injections
in
edifices using field data and modeling 2) to help define a new strategy
for
upgrading monitoring networks on active edifices. Presentations from
geological, geophysical and geological modelers as well as field
observers will
be welcome.
Conveners:
Nicolas Houlie, Berkeley
Seismological Laboratory - UC Berkeley, 205, Mc Cone Hall, Berkeley, CA
94720-4760 USA, Tel: +15106422601, Fax: +15106435811, email:
houlie@seismo.berkeley.edu, and
Seth Moran, USGS Cascades Volcano
Observatory,
1300 SE Cardinal Ct, Vancouver, WA 98683 USA, Tel: (360) 993-8934,
email:
smoran@usgs.gov, and
Agust Gudmundsson, Geoscience Centre, University
of
Gottingen, Goldschmidtstr. 3,
V28
Observations and
Techniques to Improve Prediction and Tracking of Volcanic Ash Clouds
Volcanic ash can cause severe damage to jet aircraft engines in
landing,
takeoff, or during high altitude transport. Volcanic ash can also
damage fuel
lines, abrade internal and external surfaces, and shut down major
airports.
Tracking and predicting the movement of these ash clouds is an
important factor
in mitigating the hazards posed to thousands of passengers who fly
daily in close
proximity of potentially active and currently active volcanoes. Recent
effort
has grown out of findings by the International Civil Aviation
Organization’s
(ICAO) International Airways Volcano Watch Operations Group (IAVWOPSG)
that
ash-cloud trajectories could be more accurately modeled and their
hazards
anticipated if parameters on volcanic ash release rates, height
distributions
in the atmosphere, ash properties, and other factors, were better
characterized. We invite contributions on the techniques and
observations that
are used for detecting, monitoring, tracking, predicting, and
characterizing
the properties of volcanic ash clouds.
Conveners:
Larry Garver Mastin, U.S.
Geological Survey, 1300 SE Cardinal Court Bldg. 10, Suite 100,
Vancouver, WA
98683 USA, Tel: 360-993-8925, Fax: 360-993-8980, email:
lgmastin@usgs.gov, and
Peter William Webley, ARSC, University of Alaska, Fairbanks,
Arctic
Region
Supercomputing Center Alaska Volcano Observatory 909 Koyukuk Drive,
Fairbanks,
AK 99775-6020 USA, Tel: 907-474-1542, Fax: 907-450-8603, email:
pwebley@gi.alaska.edu
(back)
V29
Explosive
Eruption Dynamics: Recent Advances and Future Directions
Explosive volcanic eruptions are an agent of rapid landscape evolution,
a
source of gases and aerosols that have regional and global climate
impact, and
a hazard to numerous population centers. The behavior of these
eruptions is
dependent on the flow dynamics of the entire volcanic system, from the
magmatic
plumbing system to atmospheric dispersal. Until recently, many of these
dynamics
have been obscured by the inherent difficulty of direct observation and
the
time-dependent, spatially heterogeneous nature of explosive eruptions.
This
session focuses on recent synergistic advances in field observation
techniques,
detailed deposit assays, numerical simulations, and experimental
approaches
that have begun to reveal the internal dynamics of explosive eruptions.
We
invite presentations on conduit and near-vent dynamics and the
particle-laden
plumes and pyroclastic density currents they generate. We particularly
encourage presentations that make connections between subfields and
highlight
the crucial observation required to constrain theoretical descriptions
of
eruptive behavior.
Conveners:
Josef Dufek,
Darcy Ogden,
V30
Fluid-Rock
Interaction in the Crust and the Upper Mantle
The presence of fluids in the crust and the upper mantle has
fundamental
consequences for many petrologic processes, such as the genesis of
magmatic
rocks, mineral reactions, rates and mechanisms of nucleation and growth
of
minerals, mineral solubility, isotope transport, mass transfer and
partial
melting. We invite contributions in the field of metamorphic and
igneous
petrology which address the questions and problems of fluid-rock
interactions
in different geological settings, and on different scales, in order to
advance
our understanding of the fundamental processes controlling fluid-rock
interactions in earth's crust and mantle. Field, experimental and
theoretical
studies ranging from shallow crustal regimes to subduction zones and
the upper
mantle are welcome.
Conveners:
Thomas Müller, Rensselaer
Polytechnic Institute,
Anke Wohlers,
V31 Lava
Flow
Dynamics and Morphology: Integrating Field, Laboratory and Theoretical
Studies
Understanding the dynamics and morphology of active lava flows, lakes
and domes
requires field study, laboratory-based measurements and theoretical
treatment.
Field studies allow us to define, describe and parameterize
characteristic
phenomena, such as emplacement styles, velocities, and heat/mass
fluxes, as
well as associated flow regimes, morphologies and their characteristic
dimensions and time scales. Our ability to achieve such field
parameterization
has recently been advanced by availability of high-quality digital
camera data,
ground-based laser and LiDAR measurements, and hand-held thermal
imagers.
Laboratory studies allow definition of characteristic crystallization
rates and
vesicularities, as well as compositional, temperature, vesicle and
crystal
dependent rheology. These can be used in one-, two- and three-phase
treatments
of the erupted lava to determine flow viscosity and yield strength, and
the
role these play on the subsequent emplacement dynamics. Finally,
theoretical
treatments allow the physics and dynamics of flow emplacement to be
defined.
Emplacement properties and styles can be modeled and explained, and the
influence of the pre-existing topography can be determined. Emplacement
models
ultimately allow flow modeling for emplacement prediction; the results
of which
can be tested against field data. This session seeks to review our
current
understanding of active lava emplacement through integration of field
study, laboratory-based
measurements and theoretical modeling.
Conveners:
Andrew Harris, University
of Hawaii, HIGP/SOEST, 1680 East-West Road, Honolulu, HI 96822 USA,
Tel:
808-956-3157, Fax: 808-956-6322, email: harris@higp.hawaii.edu, and
Alan
Whittington, University of Missouri-Columbia, Department of
Geological
Sciences, 101 Geology Building, Columbia, MO 65211 USA, Tel: (573)
884-7625,
Fax: (573) 882-5458, email: whittingtona@missouri.edu
(back)
V32
Halogens in
Volcanic Systems and their Environmental Impacts
Halogens play a significant role in volcanic systems and can have
pronounced
impacts on Earth's atmosphere and environment. This session will focus
on
results of experiments, measurements on active volcanoes and their
rocks,
atmospheric measurements, and theoretical models that investigate the
role of
halogens in volcanic systems and how they affect the Earth system.
Conveners:
Don R Baker, McGill
University, 3450 rue University Earth and Planetary Sciences, Montreal,
QC H3A
2A7 CAN, Tel: 1-514-398-7485, Fax: 1-514-398-4680, email:
donb@eps.mcgill.ca,
and Alessandro Aiuppa,
University of Palermo, ITA, email:
aiuppa@unipa.it, and
James Webster, American Museum
of Natural History, USA, email:
jdw@amnh.org
(back)
V33
Integrating
Petrological, Experimental, and Field Studies of Pyroclastic Deposits:
From
Macro-Scale Observations to Microscopic Quantification
Explosive volcanic eruptions involve magma fragmentation and
emplacement of air
fall and pyroclastic density currents. Examination of the deposits
allows
assessment of the style and dynamics of eruption and deposition,
whereas
experimental and petrological studies focus on the roles of
crystallization,
vesiculation, and magma chemistry in determining eruption and
emplacement
style. Taken together, constraints from experiments, natural pumice
samples,
and physical volcanology lead to a better understanding of the system
conditions and magma properties that determine eruptive style. This
session
will focus on the role of petrologic experimentation, analyses and
modeling in
linking magma ascent dynamics, fragmentation and the character of the
resulting
deposit. We invite presentations focusing on explosive volcanism at all
scales
and across a broad spectrum of volcanoes and magma types.
Conveners:
Lucia Gurioli, University
of Hawaii, G&G/SOEST, 1680 East-West Road, Honolulu, HI 96822 USA,
Tel:
808-956-9819, email: gurioli@hawaii.edu, and
Jessica Larsen, University
of
Alaska Fairbanks, Geophysical Institute Alaska Volcano Observatory
University
of Alaska Fairbanks, Fairbanks, AK 99775 USA, Tel: (907) 474-7992, Fax:
(907)
474-5163, email: faust@gi.alaska.edu
(back)
V34
Innovations in
Isotope Mass Spectrometry in Geochemistry
Isotope mass spectrometry is essential to geochemical research, and
recent
advances in technologies and methodologies have spawned new
applications. We
invite contributions that emphasize new developments in isotope mass
spectrometry, including advances in instrumentation, establishment of
isotope
reference materials, techniques for high-precision ratio
determinations, and
methods for measuring radiogenic, cosmogenic, and stable isotopes,
among
others.
Conveners:
Stephan Richter,
Institute for Reference Materials and Measurements (IRMM-JRC-EU),
Retieseweg
111, Geel, 2440 BEL, Tel: +32-14-571-701 (-652), Fax: +32-14-571-863,
email:
stephan.richter@ec.europa.eu, and
John N. Christensen, Lawrence
Berkeley
National Laboratory, MS70A4418 1 Cyclotron Rd., Berkeley, CA 94720 USA,
Tel:
510-486-6735, Fax: 510-486-5496, email: jnchristensen@lbl.gov, and
Kenneth WW
Sims, Woods Hole Oceanographic Institution, USA, email: ksims@whoi.edu,
and
Chuan-Chou SHEN, Department of Geosciences, National Taiwan
University,
No. 1,
Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Tapei, 10617 TWN, Tel:
886-2-3366-5878, Fax: 886-2-3365-1917, email: river@ntu.edu.tw, and
Rebecca
Thomas, New Brunswick Laboratory, DOE, 9800 S. Cass Ave., Bldg.
350,
Argonne,
IL 60517 USA, Tel: 630-252-3892, Fax: 630-252-6256, email:
rebecca.thomas@ch.doe.gov, and
Adolfo Alonso-Munoz, Institute for
Reference
Materials and Measurements (IRMM-JRC-EU), Retieseweg 111, Geel, 2440
BEL, Tel:
003214571841, Fax: 003214571863, email:
Adolfo.Alonso-Munoz@ec.europa.eu
(back)
V35
Seafloor
Hydrothermal Systems Related to Volcanic Arcs
Hydrothermal venting at back-arc spreading centers and at submerged
island-arc
volcanoes display both similarities and differences when compared to
systems
found on mid-ocean ridges, with differences attributed to a range of
factors
including the composition of the substrate (basalt, andesite, rhyolite,
dacite), contributions of magmatic volatiles to the hydrothermal
system, and
the depth and structure of the substrate. For example, recent studies
in the
southwest Pacific (
Conveners:
David Butterfield,
Wolfgang Bach,
V36 New
Developments
in Geochronology
Geochronology provides constraints on many events and processes in
Earth and
planetary sciences. This session will take stock of recent developments
in
instrumentation, techniques, theory and data analysis which lead to
more
accurate constraints for rates and time scales of geologic processes.
We will
emphasize research that exemplifies the union of petrology and other
disciplines with geochronology (including thermochronology). Examples
include
studies that address the significance of ages of nominally igneous
minerals
(e.g., coupled geochemical and geochronological characterization of
erupted
and/or intrusive crystal populations); successes in radio-isotopic
dating of
previously stigmatized (e.g., Ar/Ar dating of glasses) or novel
materials that
facilitate new areas of investigation; insights into the controls on
diffusion
parameters (e.g., radiation damage, melt inclusions, etc.); advances
leading to
better intercalibration where multiple geochronometers are used; and
technical
advances (e.g., multicollector Ar/Ar; U-series by LA-MC-ICPMS).
Conveners:
Justin Simon, University
of California at Berkeley/ Berkeley Geochronology Center, 483 McCone
Hall
Department of Earth and Planetary Science University of California at
Berkeley,
Berkeley, CA 94720-4767 USA, Tel: 510 642-9524, Fax: 510 642-9520,
email:
simon@eps.berkeley.edu, and
Roland Mundil, Berkeley Geochronology
Center, USA,
email: rmundil@bgc.org, and
Paul Renne, University of California at
Berkeley/
Berkeley Geochronology Center, USA, email: prenne@bgc.org, and
David
Shuster,
Berkeley Geochronology Center, USA, email: dshuster@bgc.org
(back)
V37 The
Dynamics and
Longevity of Silicic Magma Systems: Volcanic and Plutonic Perspectives
New studies of plutonic and modern and ancient volcanic sequences are
shedding
light on the evolution of silicic magma systems. Evidence for magma
chamber
longevity and the nature and rates of processes is preserved on a wide
range of
scales, from those of field relations to zoning of and inclusions
within single
crystals. These lines of evidence, together with theoretical studies
and
geophysics of active systems, provide insights into the dynamic
processes that
shape the evolution of magmatic systems (e.g. magma storage;
segregation of
melt and crystals; replenishment, interaction of magmas, and
rejuvenation of
stagnant magma; eruption). Our understanding of the magmatic history of
a
system relies on the preservation and exposure of the rocks that are
its
products and is amplified when both volcanic and plutonic segments can
be studied.
This session focuses on new evidence for and views on the dynamic
histories of
dominantly felsic magmatic systems, bringing together modern and
ancient,
plutonic and volcanic, and empirical and theoretical perspectives and
approaches.
Conveners:
Denise Kelly Honn,
University of Nevada, Las Vegas, 4505 Maryland Pkwy, Las Vegas, NV
89154 USA,
Tel: 702-895-4301, email: dkhonn@gmail.com, and
Calvin F. Miller,
Vanderbilt
University, Earth & Environmental Sciences 2301 Vanderbilt Place
Station B
35-1805, Nashville, TN 37235 USA, Tel: 615-322-2232, email:
calvin.f.miller@vanderbilt.edu, and
Jonathan S. Miller, San Jose State
University, San Jose, CA 95192-0102 USA, Tel: 408-924-5015, email:
Jonathan.Miller@sjsu.edu, and
Guilherme Gualda, Vanderbilt University,
Earth
& Environmental Sciences 2301 Vanderbilt Place Station B35-1805,
Nashville,
TN 37235 USA, Tel: 615-322-2976, email: ggualda@uchicago.edu
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V38
Challenges to
Electron Microprobe Analysis in Geology
2008 will be the 50th anniversary of the first commercial electron
microprobe
(MS85). A lot has changed, and a lot hasn't. In electron microprobe
microanalysis (EPMA), we still struggle to produce "good results"
with highly automated machines and fast computers. This session will
address
some of the continuing challenges of EPMA: evaluating standards,
recognizing
peak shifts in Al, Mg and Si, correcting for secondary fluorescence
(e.g. for
trace-element EPMA), dealing with element volatility, problems with
conductivity and particularly problems with EPMA of ____ (feldspar,
garnet,
carbonate, ilmenite, glass -- fill in your favorite material here).
Conveners:
John Fournelle,
University of Wisconsin-Madison, Dept of Geology & Geophysics 1215
West
Dayton St., Madison, WI 53711 USA, Tel: 608-262-7964, Fax:
608-262-0693, email:
johnf@geology.wisc.edu, and
John Donovan, CAMCOR/University of Oregon,
Dept of
Geological Sciences 1272 University of Oregon, Eugene, OR 97403 USA,
Tel: (541)
346-4632, email: donovan@uoregon.edu, and
Paul Carpenter, Washington
University, Dept of Earth & Planetary Sciences Campus Box 1169 1
Brookings
Drive St. Louis, MO, MO 63130 USA, Tel: (314) 935-4685, email:
paulc@levee.wustl.edu
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V39
Mechanisms and
Consequences of the Father's Day Intrusion at Kilauea Volcano,
On the morning of June 17, 2007, seismicity and deformation monitoring
indicated that a dike had begun to intrude the upper East Rift Zone of
Kilauea
volcano,
Conveners:
Mike Poland, U.S.
Geological Survey, Hawaiian Volcano Observatory P.O. Box 51,
Tim Orr,
U.S. Geological Survey, Hawaiian Volcano Observatory P.O. Box 51,
There are at least three Union sessions of interest to VGP membership:
U01 Whole
or Layered Mantle
Convection?
The scale of mantle convection has been one of the most debated issues
in earth
sciences since the plate tectonics revolution. Various geochemical,
seismological and geodynamical arguments have been used at different
times in
favor or against whole mantle convection. Recently, seismic images of
slabs
penetrating into the lower mantle have been offset by evidence for slab
stagnation in the transition zone. Thermo-chemical models of whole
mantle
convection are revealing possible compositional layering. Isotopic
evidence for
distinct geochemical reservoirs has not been definitively dismissed.
This
session will provide the forum for a multi-disciplinary review of the
arguments
of proponents on both sides of the issue, with emphasis on specific
experiments
that could help to resolve it.
Conveners:
Barbara A. Romanowicz,
Univ. of California at Berkeley, Seismological Laboratory, 215 McCone
Hall,
Berkeley, CA 94720 USA, Tel: 510 643 5690, Fax: 510 643 5811, email:
barbara@seismo.berkeley.edu, and
Louise H. Kellogg, University of
California at
Davis, Department of Geology, One Shields Avenue, Davis, CA 95616 USA,
Tel: 530
752 3690, email: kellogg@geology.ucdavis.edu, and
Donald DePaolo,
University of
California at Berkeley, Department of Earth and Planetary Science, 301
McCone
Hall, Berkeley, CA 94720 USA, Tel: 510 643 5064, email:
depaolo@eps.berkeley.edu
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U02 Hadean
Times:
From Magma Ocean Mode to Modern Geodynamic Regimes
This session is devoted to the understanding of the petrological,
geochemical,
and geodynamical processes that took place in the Hadean Earth, at all
depths
and at all scales, leading from the magma ocean to a modern geodynamic
regime.
From the segregation of the core, to the formation of the continental
crust,
through the various stages of crystallization of the magma ocean,
extraction of
melts with ensuing depletion of the mantle, and onset of convection and
plate
tectonics. We seek contributions from petrology, trace element and
isotope
geochemistry, and geodynamics. More specifically, we welcome
contributions
related to: [1] core formation; [2] formation of the Hadean crust and
lithosphere; [3] crystallisation and melting processes in the magma
ocean and
evolution of the mantle; [4] the earliest stages of plate tectonics;
[5]
thermal evolution, mantle convection and crustal recycling; [6] inner
core
crystallization initiation of the magnetic field.
Conveners:
Janne Blichert-Toft,
Ecole normale superieure de Lyon,FRA, email: jblicher@ens-lyon.fr, and
James
Badro, Institut de physique du globe de Paris, FRA, email:
badro@ipgp.fr, and
Frederick J. Ryerson, Lawrence Livermore National Laboratory,
Stephane Labrosse, Ecole Normale Superieure de
Lyon, 46
Allee d''Italie, Lyon, 69364 FRA, email:
stephane.labrosse@ens-lyon.fr
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U06
Chemical
Geodynamics: The Road Ahead
It has now been 25 years since the term “Chemical Geodynamics” was
coined. It
embraces multiple disciplines that together attempt to unlock the
secrets of
the evolution, composition, dynamics and linkages between the surface
and the
deep interior of the Earth. Mafic crust is formed at spreading ridges,
chemically interacts with the ocean and is veneered with sediment
during plate
aging. Continental erosion and weathering provides the material for the
sediment veneer. Subduction subjects the sediment/ocean crust/mantle
lithosphere package to a bewildering array of chemical and physical
processes
at a wide range of pressures and temperatures. One outcome is the
extraction of
components, via arc magmatism, that build new continental crust. The
lithospheric
residues of this subduction process are recycled into shallow and/or
deep
mantle, and subjected to a myriad of mixing, stirring and aging
processes
during mantle convection on all scale lengths. Some may be hidden from
sight
for eternity, some are recycled to the surface via upwelling plumes or
via
general circulation, transiting back through the upper mantle and
eventually
back into the ridge factory. Thus, on this Silver Anniversary, it is
time to
take stock and look forward. While geochemistry is the major discipline
equipped to reveal the timing, evolutionary and compositional aspects
of the
geodynamic cycle, the geophysical disciplines contribute understanding
of the
present state of the planet and its internal dynamics. Progress has
come and
will come from the interfacing of these disciplines. This session
intends to
ask an assembly of scientists from diverse disciplines to look ahead,
from a
synoptic view of where we stand and where the roadblocks are. We will
be
targeting especially interdisciplinary presentations, to show how
synergetic
research amongst their fields can energize progress, and provide a view
of
where Chemical Geodynamics is headed.
Conveners:
Stanley
Albrecht W. Hofmann, Max Planck Institute for Chemistry,
Postfach
3060,
Nobumichi Shimizu, Woods Hole Oceanographic Institution, Woods
Hole, MA
02543
