T32C:
Oceanic and Arc Lithospheres: Clues from Modern Examples and Ophiolites I


Session ID#: 8985

Session Description:
Much of what has been learned from Alpine-Himalayan ophiolite studies in the last ~50 years, despite lingering debate as to their exact genetic setting, has been widely used to interpret the structure of the oceanic lithosphere flooring modern oceans. In contrast, most Pacific ophiolitic complexes have been interpreted as newly created supra-subduction lithosphere formed in Arc to Forearc settings.

Intriguingly, the comparatively abundant studies of crustal and lithospheric structures formed at modern Mid Ocean Ridge, Back-arc, Arc, and Forearc settings have rarely been used to elucidate the nature of ophiolites and constrain where and how most ophiolites formed.

In an attempt to reconcile these contrasting views and approaches, we incite an across-communities discussion (with contributions from marine geology and geophysics, petrology-geochemistry, tectonics, ophiolite studies) to reexamine the link between modern oceans and arcs and their past ophiolitic analogues, and better assess what ophiolites tell us.

Primary Convener:  Cesar R Ranero, ICM-CSIC, Barcelona Center for Subsurface Imaging, ICREA at CSIC, Instituto de Ciencias del Mar, Barcelona, Spain, Barcelona, Spain
Conveners:  Philippe Agard, Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP, Paris, France, Mathilde Cannat, Institut de Physique du Globe de Paris, Paris, France and Robert J Stern, University of Texas at Dallas, Geosciences, Richardson, United States
Chairs:  Cesar R Ranero, Institució Catalana de Recerca i Estudis Avançats, ICREA, Barcelona, Spain, Barcelona, Spain and Robert J Stern, University of Texas at Dallas, Richardson, TX, United States
OSPA Liaison:  Cesar R Ranero, ICM-CSIC, Barcelona Center for Subsurface Imaging, ICREA at CSIC, Instituto de Ciencias del Mar, Barcelona, Spain, Barcelona, Spain
Co-Organized with:
Tectonophysics, and Volcanology, Geochemistry and Petrology

Cross-Listed:
  • OS - Ocean Sciences
  • S - Seismology
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

3001 Back-arc basin processes [MARINE GEOLOGY AND GEOPHYSICS]
3035 Midocean ridge processes [MARINE GEOLOGY AND GEOPHYSICS]
3042 Ophiolites [MARINE GEOLOGY AND GEOPHYSICS]
8185 Volcanic arcs [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Upper Crustal Structure of Oceanic Lithosphere Formed at Intermediate to Fast Rates: A Basis for Comparison of MOR vs SSZ Ophiolites (Invited) (64501)
Jeffrey Karson, Syracuse University, Earth Sciences, Syracuse, NY, United States
A New Compilation of Seismic Structure in the Pacific & NW Atlantic (70016)
Richard L Carlson, Texas A&M University, Geology & Geophysics, College Station, TX, United States
Physical Properties and Seismic Structure of Izu-Bonin-Mariana Fore Arc crust: Results From IODP Expedition 352 and Comparison with Oceanic Crust (80726)
Gail Lynn Christeson, UTIG, Austin, United States, Sally Morgan, University of Leicester, Department of Geology, Leicester, United Kingdom, Shuichi Kodaira, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, Mikiya Yamashita, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan and IODP Expedition 352 Scientists
Seismic structure of ultra-slow spreading crust formed at the Mid-Cayman Spreading Centre, Caribbean Sea (77834)
Ingo Grevemeyer1, Michaela Merz1, Anke Dannowski1, Cord A Papenberg1, Nicholas W Hayman2, Harm J Van Avendonk3 and Christine Peirce4, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)Institute for Geophysics, Austin, TX, United States, (3)University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, (4)University of Durham, Durham, United Kingdom
Comparing Residual Mantle Peridotites from Ophiolites and Mid-Ocean Ridges (Invited) (79894)
Peter B Kelemen, Lamont -Doherty Earth Observatory, Palisades, NY, United States
High-silica Rocks from Oceans, Arcs and Ophiolites: What Can They Tell Us About Ophiolite Origins? (Invited) (83961)
Michael R Perfit, University of Florida, Department of Geological Sciences, Gainesville, United States, Craig Lundstrom, University of Illinois at Urbana Champaign, Department of Geology, Urbana, IL, United States and V. Dorsey Wanless, Boise State University, Geosciences, Boise, United States
Tectonic evolution of the outer Izu-Bonin-Mariana fore arc system: initial results from IODP Expedition 352 (72891)
Walter Kurz, University of Graz, Department of Earth Sciences, NAWI Graz Geocenter, Graz, Austria, Eric C. Ferre, Southern Illinois University at Carbondale, Department of Geology, Carbondale, United States, Alastair Harry Forbes Robertson, University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom, Aaron J Avery, Florida State University, Earth, Ocean and Atmospheric Sciences, Tallahassee, FL, United States, Steffen Kutterolf, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and IODP Expedition 352 Scientists
Extensive young dacite lava flows between boninite and BABB in a backarc setting: NE Lau Basin (76002)
Robert W Embley, Oregon State University, CIMRS, Corvallis, OR, United States and Kenna Harmony Rubin, University of Hawaii at Manoa, Earth Sciences, Honolulu, HI, United States

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