T23F:
NW Pacific Marginal Basins: Geodynamics and Hazard II

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Session ID#: 16637

Session Description:
The boundary between easternmost Eurasia and and NW North America with the NW Pacific Ocean is marked by a series of marginal basins such as the Aleutian Basin, the Komandorsky Basin, the Kurile Basin, and the marginal basin complex that lies between Japan, Korea, and mainland Asia. These all formed as backarc basins during Cenozoic time, but it is unknown whether they formed by similar or different mechanisms (backarc basins vs. trapped Pacific seafloor; continental rifting vs. seafloor spreading).  Understanding how these basins formed is further complicated because none are now actively opening and all contain thick sediments. They pose important geodynamic problems but because some of these basins lie near regions with rapidly developing economies and present increasingly significant natural hazards such as earthquakes and tsunamis. This session will foster broad discussion and stimulate joint efforts to study and better understand these marginal basins and the risks these pose.
Primary Convener:  Robert J Stern, University of Texas at Dallas, Geosciences, Richardson, TX, United States
Conveners:  Jun-Ichi Kimura, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics (IMG), Kanagawa, Japan, Boris Baranov, Russian Academy of Sciences, Institute of Oceanology, Moscow, Russia and Sang-Mook Lee, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan; Seoul National University, School of Earth and Environmental Sciences, Seoul, Korea, Republic of (South)
Chairs:  Boris Baranov, Russian Academy of Sciences, Institute of Oceanology, Moscow, Russia and Robert J Stern, University of Texas at Dallas, Geosciences, Richardson, TX, United States
OSPA Liaison:  Robert J Stern, University of Texas at Dallas, Geosciences, Richardson, TX, United States

Cross-Listed:
  • NH - Natural Hazards
  • OS - Ocean Sciences
  • SI - Societal Impacts and Policy Sciences
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

1031 Subduction zone processes [GEOCHEMISTRY]
3001 Back-arc basin processes [MARINE GEOLOGY AND GEOPHYSICS]
8104 Continental margins: convergent [TECTONOPHYSICS]
9355 Pacific Ocean [GEOGRAPHIC LOCATION]

Abstracts Submitted to this Session:

Plate tectonic reconstruction of the northeast Eurasian margin and Alaska since ~50 Ma using subducted slab constraints (193450)
Jonny Wu1, John Suppe2 and Yi-Wei Chen1, (1)University of Houston, Department of Earth and Atmospheric Sciences, Houston, TX, United States, (2)University of Houston, Department of Earth and Atmospheric Sciences, Houston, United States
Geophysical Evidence for the Origin of the Aleutian Basin (141524)
Daniel S Scheirer, US Geological Survey, Menlo Park, CA, United States, Ginger A Barth, USGS Pacific Coastal and Marine Science Center, Moffett Field, United States, David William Scholl, University of Alaska Fairbanks, Emeritus, Geology and Geophysics, Fairbanks, AK, United States and Robert J Stern, University of Texas at Dallas, Geosciences, Richardson, TX, United States
The Argument that the Oceanic Crust of the Backarc Aleutian Basin (Bering Sea) Is a Terrane of Pacific Oceanic Crust, Possibly the Kula Plate, Accreted to the North American Plate at ~50-55 Ma (123257)
David William Scholl, USGS Geological Survey, Emeritus, Earthquake Science Center, Moffett Field, CA, United States
New Insights into the Origin of the Bering Sea from SO201 and SO249 cruises (Invited) (136173)
Kaj Hoernle1, Reinhard Werner1, Maxim Portnyagin1, Gene M Yogodzinski2, Folkmar Hauff1, Boris Baranov3 and Sergei Silantyev4, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)University of South Carolina, School of Earth-Ocean-Environment, Columbia, United States, (3)Shirshov Institute of Oceanology, Moscow, Russia, (4)Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Moscow, Russia
Kurile Backarc Basin: Trapped Pacific Floor or Extension/Spreading Structure? (144166)
Boris Baranov1, Reinhard Werner2, Kaj Hoernle2, Paul van den Bogaard2, Folkmar Hauff2 and Karina Dozorova1, (1)Shirshov Institute of Oceanology, Moscow, Russia, (2)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Geodynamical simulation of the evolution of Kuril Basin (127109)
Yanan Shi1, Dongping Wei1, Zhonghai LI1, Mengxue Liu1 and Shaopo Wang2, (1)UCAS University of Chinese Academy of Sciences, Beijing, China, (2)Key Laboratory of Computational Geodynamics, College of Earth and planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
Crustal formation and deformation processes in the eastern margin of the Japan Sea back-arc basin deduced from active-source seismic data (Invited) (143726)
Shuichi Kodaira1, Takeshi Sato1, Tetsuo No2 and Seiichi Miura1, (1)Japan Agency for Marine-Earth Science and Technology, R&D Center for Earthquake and Tsunami, Yokohama, Japan, (2)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Research Institute for Marine Geodynamics, Yokohama, Japan
Differing Styles of Magmatic Emplacement and the Formation of Different Crustal Types during the Opening of Back-Arc Basins, a Case in Point from the East Sea/Sea of Japan (196451)
Sang-Mook Lee, Seoul National University, School of Earth and Environmental Sciences, Seoul, Korea, Republic of (South)

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