| MARGINS-related
Sessions on
this page: |
|
The Contributions
of 20 Years of Scientific Ocean Drilling |
|
Beyond Hydrate Ridge: Studies
of Natural Gas Hydrate From Around the Globe |
|
Geological and Biogeochemical Processes
in a Wet Tropical Setting: New Guinea, Source to Sink |
|
Gas Hydrates in
Accretionary Complexes |
|
Identifying Submarine
Landslide Time of Failure |
|
Results from MARGINS-funded work in the Gulf of Papua |
|
Results from MARGINS-funded work in the Gulf of Papua (Posters) |
|
Mechanical Strength
of the Continental Lithosphere |
|
Izu-Bonin-Mariana
Arc Processes and Progress |
|
Structure and Evolution
of Nonvolcanic Rifted Margins |
|
At the Seismogenic
Front: Dynamic Processes at Convergent Margins |
|
The Structure and
Physical Properties of Grain Boundaries in Rocks |
|
Structure and Tectonics of the Western U.S. and the Gulf of California
I Posters |
|
Light Element Geochemistry:
Insights Into High-Temperature Processes |
|
The First Historical
Eruption of Anatahan Volcano, Mariana Islands |
|
Oceanographic Research and Marine
Mammals |
Please send suggestions for additional sessions
or other events to be included on this page to the
MARGINS Office.
U02: The Contributions of 20 Years
of
Scientific Ocean Drilling
Conveners:
Keir Becker, University
of Miami - RSMAS, USA
Nicklas Pisias,
COAS, Oregon State University, USA
Description:
The year 2003 marks 20 years of scientific ocean drilling through the Ocean
Drilling Program (ODP), which has been widely hailed as perhaps the most
successful example of international cooperation in all of geosciences and
has resulted in important scientific advances in nearly all subfields of
marine geology and geophysics. This year also heralds the formal beginning
of the Integrated Ocean Drilling Program (IODP), an even more ambitious
international program that will utilize a range of drilling platforms for
scientific ocean drilling throughout the world's ocean basins. This session
will celebrate the scientific contributions of scientific ocean drilling
through the full range of geoscience themes. We particularly solicit abstracts
that (1) synthesize interdisciplinary, thematic, or regional results over
multiple expeditions, or (2) present historical perspectives on contributions
of scientific ocean drilling from DSDP through ODP with an eye to the future
contributions of IODP. We also encourage submission of abstracts that relate
to the major findings of scientific ocean drilling, including (but not
limited to) the evidence for climate change, both abrupt and long-term;
the record of sea-level change; microbial presence and processes in the
ocean sediments and crust; the nature of oceanic crust; subduction processes;
and fluid flow in oceanic crust and sediments and in subduction settings.
Session
U02 web page
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of page
OS07: Beyond
Hydrate Ridge: Studies of Natural Gas Hydrate From Around
the Globe
Conveners:
Ginger Barth, U.S. Geological Survey, Menlo Park, USA
David Scholl, U.S. Geological Survey, Menlo Park, USA
Description:
Methane and related natural gases have been identified in marine, inland sea,
and permafrost settings around the globe, both as free gas and within natural
gas hydrates. From continental margin settings to the deepest ocean basins,
methane is evidenced by the presence of bottom simulating seismic reflectors,
velocity anomalies, thermal anomalies, geochemical signatures, and thriving
biological communities. This methane system is of direct societal significance,
as it plays a role in global climate change and geologic hazards and also
represents a potential energy resource. This broadly inclusive AGU session
solicits contributions that address the generation, detection, characterization,
quantification, and/or implications of natural gas hydrate deposits. Studies
of methane hydrate in deep water settings are particularly encouraged.
Modeling and laboratory studies aimed at the quantitative interpretation
of field observations are also particularly welcomed. The aim of this session
is to bring together the many disciplines involved in hydrate studies,
thereby providing a meeting focus for the natural gas and gas hydrates
research community. This session will be coordinated with the more site-focused
one on Gas Hydrates in Accretionary Complexes (convener: A. Trehu). Conveners
will be happy to guide relevant contributions to their most appropriate
session.
Session
OS07 web page
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page
OS08: Geological and
Biogeochemical Processes in a Wet Tropical Setting: New
Guinea, Source to Sink
Conveners:
Robert Aller, Stony Brook University, USA
Charles Nittrouer, University of Washington, USA
Description:
The dominant transfer of particulate and dissolved components on the Earth's
surface occurs in wet tropical settings. Among these settings, the islands
of the Indo-Pacific Archipelago are very important. Intense research has
started in association with the largest island, New Guinea. This session
represents an opportunity for international scientists working in both
the source areas on land and the sink areas of the ocean to present and
integrate their research. This will include studies of hydrology, geomorphology,
sedimentology, stratigraphy, and organic/inorganic geochemistry that define
the processes extending from fluvial environments to the continental margin.
Session
OS08 web page
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OS09: Gas Hydrates in Accretionary Complexes
Conveners:
Anne Trehu, Oregon State University, USA
Joel Johnson, Oregon State University, USA
Description:
The year 2002 was marked by several cruises focused on studying
gas hyrates in accretionary complexes, including ODP Leg 204
to Hydrate Ridge, offshore Oregon. In this session we seek
to bring together researchers from a broad range of disciplines
to further our understanding of the processes that control
formation and dissociation of gas hydrates in this environment.
We encourage presentations of new data and of modeling efforts
that incorporate constraints from the new data. This session
will be coordinated with a related session on the global occurrence
of gas hydrates to provide a forum for furthering research
on naturally occurring gas hydrates.
Session OS09 web page
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of page
OS11: Identifying Submarine Landslide
Time of Failure
Conveners:
David Tappin,
British Geological Survey, UK
Philip Watts,
Applied Fluids Engineering, Inc., USA
Description:
Submarine landslides are now recognized as significant mass movement and tsunami
hazards. While marine geology techniques for identifying submarine landslides
are well established, there remains considerable uncertainty with regard
to the time of failure. Given the general absence of submarine landslide
detection instruments, the only way to assess the involvement of a submarine
landslide in a given natural disaster is to identify the time of failure
with reasonable accuracy. We consider a wide range of interdisciplinary
techniques that can assist in determining the time of failure. These methods/approaches
include: morphological or depositional, biological, geothermal, radioisotope,
geotechnical, fluid expulsion, seismic and acoustic, and water wave observation.
We attempt to demonstrate the specific roles for different types of sampling,
instrumentation, and observation.
Session
OS11 web page
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of page
OS11A: Geological and Biogeochemical Processes in a Wet Tropical Setting: New Guinea, Source to Sink
0800 Monday, 8 Dec
Room MCC 3000
Holocene Evolution of the Middle Fly River, Papua New Guinea
· J Chappell, W E Dietrich
Morphodynamic Modeling of the Co-evolution of Channel and Floodplain in Large, Sand-bed Rivers
· J Lauer, G Parker
Evidence for Low Sea Level Incision of the Gulf Of Papua Shelf by the Fly River and by Tidal Currents During the Quaternary
· P T Harris, A Heap, V Passlow, M Hughes, J Daniell, O Anderson
Submarine Rivers of Mud and Sand: Channels Dispersing Sediment Across the Fly River Clinoform
· C A Nittrouer, J S Crockett, A S Ogston, R W Sternberg, B T Donahue, D F Naar, M A Goni, J Walsh, N Driscoll
Sediment Transport Under Monsoon Conditions on the Fly River Clinoform, Papua New Guinea
· A S Ogston, J S Crockett, R W Sternberg, C A Nittrouer
Relationships Between Early Diagenetic Processes, Carbon Remineralization, and Sedimentary Dynamics in the Gulf of Papua Deltaic Complex
· R C Aller, N E Blair, C Panzeca, A Hannides, C Heilbrun
Geochemical Budget for Barium on the Wet Tropical Continental Shelf \& Slope of the Gulf of Papua, Papua New Guinea.
· G J Brunskill, I Zagorskis, J Pfitzner, H Wu, G Shen, R Hamme
Benthic Communities as Indicators of Geological and Biogeochemical Processes in the Gulf of Papua
· J Y Aller, S Dhir, J Chummar, M M Dantzler, R C Aller
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OS12A: (Poster Session) Geological and Biogeochemical Processes in a Wet Tropical Setting: New Guinea, Source to Sink
1330 Monday, 8 Dec
MCC Level 1, Posters 183-193
Platinum Group Element Fractionations in Sediments in the Gulf of Papua, New Guinea
· C E Martin, B Peucker-Ehrenbrink, G Ravizza, G Brunskill
Biogeochemical and Sedimentary Processes in the Wet Tropics
· M A Goni, N Monacci, R Gisewhite
Carbon Cycling And Diagenetic Carbonate Formation in the Gulf of Papua, Papua New Guinea
· T Fang, R Aller, N Blair
Preliminary Characterization of Organic Geochemistry in the Fly-Strickland River System, Papua New Guinea
· S R Alin, R Aalto, S M Remington, J E Richey
Sediment Deposition and Accumulation in a Seasonal Repository of the Fly River Shelf Clinoform, Papua New Guinea
· J S Crockett, C A Nittrouer, A S Ogston, D F Naar
Controls on Subaqueous-Delta Clinoform Development
· J Walsh, N W Driscoll, C A Nittrouer
Characterization and Timing of Siliciclastic Sediment Fluxes to Continental Slopes of the Coral Sea During the Late Quaternary
· J M Francis, G R Dickens, M C Page
A Tropical View of Quaternary Sequence Stratigraphy and a Dynamic View of the Sink Along the Northeast Australian Margin: The Accumulation of Riverine Material on Slopes Since the Last Glacial Maximum
· M C Page, G R Dickens, G B Dunbar
Response of the Ganges dispersal system to climate change: a source-to-sink view since the last interstade
· S L Goodbred Jr.
The Role of Conjoining (Tie) Channels in Lowland Floodplain Development and Lake Infilling
· J C Rowland, W E Dietrich, G Day, K Lepper, C J Wilson
Mapping the Extent and Rate of Overbank Deposition Using Mine-Derived Sediment Tracers Along the Strickland River, Papua New Guinea
· S C Apte, W E Dietrich, G M Day, C Reibe, R Aalto, J Sanders, W Lauer, S L Simpson, A Marshall, M Bera
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S15: Mechanical Strength of the Continental
Lithosphere
Conveners:
Wang-Ping Chen, University
of Illinois, Urbana-Champaign, USA
Brian Evans, Massachusetts Institute of Technology,
USA
Description:
How mechanical strength of the continental lithosphere varies with depth is
an issue central to a wide range of interdisciplinary topics. For instance,
the concept that a weak, ductile lower crust overlies a strong lithospheric
mantle has led to diverse ideas such as linking climate changes to posttectonic
magmatism, hydration of the mantle during continental breakup, and mechanisms
for wholesale uplift of plateaus. Consequently, there are renewed interests
in examining the basic tenets of continental rheology, and this session will
provide a forum of wide perspective, bringing together latest findings such
as intracontinental earthquakes, rheological effects of volatiles and partial
melts, and geodynamic modeling of relevant data sets. We welcome abstracts
that constrain the mechanical strength of the deep lithosphere under continental
landmasses using in situ geophysical observations (such as surface deformation,
lithospheric bending, earthquakes and seismic imaging, gravity, and heat flow),
experimental rock mechanics, and petrographic and structural studies of naturally
deformed rocks. We are particularly interested in comparing results, implications,
and inferences drawn from different methods to identify key issues. Our goal
is to promote interdisciplinary integration of results that will lead to the
next generation of rheological models for the continental lithosphere.
Session
S15 web page
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of page
T05: Izu-Bonin-Mariana Arc Processes
and Progress
Conveners:
Jim Gill , UCSC,
USA
Simon Klemperer,
Stanford, USA
Yoshi Tamura,
IFREE/JAMSTEC, Japan
Description:
Much work has been conducted since the Izu-Bonin-Mariana (IBM) Workshop in
Hawaii, 2002 (see Eos volo 84, p. 3). This session is an opportunity to share
recent results and for newcomers to learn about this study site of the NSF
MARGINS and Japanese Subduction Factory programs. Contributions are encouraged
from anyone currently working on the geology, geophysics, or geochemistry of
the subducting plate, forearc, volcanic arc, or backarc of the entire IBM system,
the history of the Philippine Sea Plate as it affects IBM, or other forcing
functions applicable to the arc.
Session
T05 web page
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of page
T06: Structure and Evolution of Nonvolcanic
Rifted Margins
Conveners:
Brian Tucholke, Woods Hole Oceanographic Institution,
USA
Jean-Claude Sibuet, Ifremer Centre de Brest, France
Dale Sawyer, Rice University, USA
Description:
Continental rifting leading to seafloor spreading is a fundamental component
of the plate-tectonic cycle that still is poorly understood. The processes
that attend continental separation (crustal thinning, volcanism, faulting,
uplift, and eventual thermal subsidence) profoundly modify continental edges
and leave behind important geological records of their operation. To understand
these processes, we need detailed information on lithospheric structure and
the stratigraphic record, both from continental edges in submarine settings
and from fossil margins now exposed on land. In addition, data from conjugate
margins are important for determining the degree to which rifting processes
and development of the sedimentary record are symmetrical on opposing margins.
This session focuses on nonvolcanic rifted margins. Data acquired in recent
years show these margins to be structurally complex, manifesting such varied
features as differential thinning of continental crustal layers, multiple
generations of normal faulting, development of metamorphic core complexes,
extensive exhumation and serpentinization of mantle, association with early
ultraslow seafloor spreading, and contrasting thermal and subsidence histories
between margin conjugates. This session is intended to foster new insights
into the evolution of nonvolcanic margins from recently acquired geological,
geophysical, and drilling data, as well as from synthesis of existing data.
We particularly encourage abstracts that compare and contrast conjugate margins
and that provide new perspectives from subaerial as well as submarine environments.
Session
T06 web page
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of page
T11: At the Seismogenic Front: Dynamic
Processes at Convergent Margins
Conveners:
Harold Tobin, New Mexico Tech, USA
Kohtaro Ujiie, IFREE/JAMSTEC, Japan
Susan Bilek, New Mexico Tech, USA
Demian Saffer , University of Wyoming, USA
Description:
Current multidisciplinary research is rapidly changing our view of the shallow
subduction zone processes governing strain accumulation and release, fault
mechanics, fault hydrogeology, tsunamigenesis, and earthquake dynamics. This
session will provide a forum for new results in geophysical imaging, experimental
fault mechanics, seismic source processes, geodetics, structural geology, in
situ studies, and other topics related to the shallow subduction zone environment.
We welcome submissions on any topic related to forearc dynamics and the seismogenic
zone at any convergent margin, especially those highlighting the Nankai Trough
of southwestern Japan and the Middle America Trench, the two focus sites of
the MARGINS SEIZE program.
Session
T11 web page
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T17: The Structure and Physical Properties
of Grain Boundaries in Rocks
Conveners:
Georg Dresen, GeoForschungsZentrum, Germany
David Kohlstedt, University of Minnesota, USA
Wirth Richard, GeoForschungsZentrum, Germany
Description:
Grain boundaries and phase boundaries are important structural defects in rocks.
In polycrystalline, multiphase materials, grain interfaces are present in many
different configurations forming extended three-dimensional networks very much
like the networks of liquid films that constitute foams. Even though grain
boundary structures are measured on the nanometer scale, large-scale properties
of rocks such as elasticity, strength, electrical conductivity, and diffusive
mass transport depend on the physical and chemical properties of grain boundaries.
Consequently, geodynamic processes involving rock deformation, fluid transport,
metamorphic reactions, melting, and melt segregation all depend critically
on the properties of grain boundaries. Our conceptual view of the grain boundary
structure stems largely from observations on metals and ceramics. However,
since the mineralogical properties and chemical composition of rocks are significantly
more complex, we simply do not know to what extent existing grain boundary
models are representative for rocks. We need to understand the structure and
transport properties of grain and phase boundaries present in Earth materials
on the atomic scale. Recent implementation of new analytical techniques and
significant advances in high-resolution microstructure analysis are about to
fundamentally change our view of structure and physical properties of grain
boundaries. With enhanced computational power and new software development,
sophisticated atomic-scale models can now be tested against experimental observations.
The session will cover four thematic topics from experimental, analytical,
and modeling perspectives of grain boundaries: (1) high-resolution microstructure
investigation of natural and synthetic grain and phase boundaries; (2) modeling
of grain boundary structures and processes; (3) physical properties of grain
boundaries such as conductivity and diffusivity; (4) strain localization in
crust and mantle; and (5) interface diffusion controlled creep of crustal and
mantle rocks.
Session
T17 web page
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of page
T31: Structure and Tectonics of the Western U.S. and the Gulf of California I Posters
Abstracts:
H. Brown et al, Seismic Imaging of the continent-ocean transition in the southern Gulf of California
W.R. Drake et al, San José Island Accommodation Zone, Baja California Sur, Mexico: A Key to Onshore-Offshore Fault Relationships along the Western Margin of the Southern Gulf of California
J. Fletcher et al, Palinspastic Reconstructions of the Gulf of California Based on Airy Isostatic Profiles: Evidence for One Kinematic Phase of Neogene Shearing
R. Givler et al, Timing, Style, and Magnitude of Upper Crustal Extension, Sierra San Felipe, NE Baja California, Mexico: Constraints on Rift Processes in the NW Gulf of California Extensional Province
A. González-Fernández et al, Seismic images of faulting and fossil subduction of the southern Baja California margins
Lizarralde et al, Crustal structure and rift evolution across the Guaymas Basin, Gulf of California
F. Sutherland, et al, Continent-Ocean Transition Across the Alarcon Basin, Gulf of California from Seismic Reflection and Refraction Data
Umhoefer et al, A possible widespread Upper Miocene to Lower Pliocene rift-related sequence under the marine shelf from Mazatlan to the Tres Marias islands, southeastern Gulf of California, Gulf of California MARGINS project
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V08: Light Element Geochemistry: Insights
Into High-Temperature Processes
Conveners:
Bill McDonough,
University of Maryland, USA
Craig Lundstrom, Univ. of Illinois-Urbana Champaign,
USA
Adam Kent, Oregon State University, USA
Description:
New insights into high-temperature processes are being realized because of
recent analytical advances in the analyses of trace light elements and their
isotopes. Several nontraditional light isotope systems are beginning to mature
(e.g., Li, B, Mg, Cl), providing novel data and information about processes
as diverse as magmatism, high-T metamorphism, and crust-mantle recycling. In
addition, new data for light element partitioning and diffusion provide experimental
constraints on the mechanisms and rates of processes affecting the geochemistry
of these elements. This symposium will bring together scientists from diverse
backgrounds who are examining high-temperature processes using constraints
provided by light element studies. We welcome a range of experimental, petrological,
chemical, and isotopic investigations of these elements related to high-temperature
Earth processes. We also welcome contributions detailing technical advances
in isotopic and abundance measurement of light elements in geological materials.
Session V08 web page
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of page
V15: The First Historical Eruption of
Anatahan Volcano, Mariana Islands
Conveners:
Doug Wiens, Washington University, St. Louis, USA
Tobias Fischer, University of New Mexico, USA
David Hilton, Scripps Institution of Oceanography, USA
Juan Camacho, Emergency Management Office, Saipan, UMI
Description:
The first historical eruption of Anatahan volcano in the Mariana Islands began
on 10 May 2003. The eruption has been well documented by satellite observations,
several sampling trips, and seismological instrumentation fortuitously installed
4 days prior to the eruption. We encourage the submission of abstracts that
discuss the geophysical and volcanological observations of the eruption as
well as the geochemistry and petrology of the recently erupted materials. In
addition, we welcome abstracts that discuss the implications of these observations
for our understanding of geochemical and geodynamical processes associated
with Mariana arc volcanism.
Session
V15 web page
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of page
PA01: Oceanographic Research and Marine
Mammals
Conveners:
John Orcutt,
Scripps Inst. of Oceanography, La Jolla, USA
G. Michael Purdy,
Lamont-Doherty Earth Observatory, USA
Darlene Ketten,
Woods Hole Oceanographic Inst., USA
Description:
The first historical eruption of Anatahan volcano in the Mariana Islands began
on 10 May 2003. The eruption has been well documented by satellite observations,
several sampling trips, and seismological instrumentation fortuitously installed
4 days prior to the eruption. We encourage the submission of abstracts that
discuss the geophysical and volcanological observations of the eruption as
well as the geochemistry and petrology of the recently erupted materials. In
addition, we welcome abstracts that discuss the implications of these observations
for our understanding of geochemical and geodynamical processes associated
with Mariana arc volcanism.
Session
PA01 web
page
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