[S-CG54] Hard-Rock Drilling: Oman to Oceanic Lithosphere to Island Arc Formation and Beyond

Mon. May 21, 2018 1:45 PM - 3:15 PM A09 (Tokyo Bay Makuhari Hall)

convener:Eiichi TAKAZAWA(Department of Geology, Faculty of Science, Niigata University), Katsuyoshi Michibayashi(Department of Earth and Planetary Sciences, Nagoya University), Peter B Kelemen (共同), Damon A H Teagle (Ocean & Earth Science, National Oceanography Centre Southampton, University of Southampton, SO14-3ZH, Southampton, UK), Chairperson:Kelemen Peter(Columbia University), Morishita Tomoaki(Kanazawa University)

The on-going Oman Drilling Project (OmDP) has drilled numerous hard-rock cores of ancient oceanic lithosphere and the underlying subduction zone of the Samail ophiolite in Oman, with support from ICDP, IODP, the Sloan Foundation's Deep Carbon Observatory, and Japanese, US, and European research agencies. Moreover, a number of IODP expeditions have focused on hard-rock drilling over the last 5 years including Expedition 352 in 2014, which drilled the volcanic sequence associated with subduction initiation in the Bonin fore-arc, Expedition 357, which drilled the Lost City hydrothermal field, Expedition 360, which drilled the lithosphere associated with ultraslow-spreading at the Southwest Indian Ridge in 2016, and Expedition 366, which drilled the serpentinite seamounts in the Mariana fore-arc. In this session, we invite presentations on the scientific results of hard-rock drilling at these and other sites. We also invite related presentations on oceanic lithosphere, island arc formation, and any other significant issue that could be addressed by future hard-rock drilling. This includes marine studies of oceanic lithosphere and on-land geological investigations of ophiolites, accreted arcs, and subduction complexes. The session is intended to be interdisciplinary, including the fields of geophysics, geochemistry, petrology, engineering, and biology.

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1:45 PM - 2:15 PM

[SCG54-07] Tethyan anhydrite preserved in the lower crust of the Samail ophiolite? Evidence from Oman Drilling Project Holes GT1A and 2A.

★Invited Papers

*Damon A H Teagle¹, Michelle Harris², Laura Crispini³, Jeremy Deans, Wayne Pat Shanks III⁴, Peter Kelemen⁵, Oman Drilling Project Phase 1 Science Party (1.Ocean & Earth Science, National Oceanography Centre Southampton, University of Southampton, SO14-3ZH, Southampton, UK, 2.Plymouth University, Plymouth, PL4, United Kingdom, 3.University of Genoa, Genoa, Italy, 4.U.S. Geological Survey, Denver, CO, United States, 5.Columbia University, Palisades, NY, United States)

2:15 PM - 2:30 PM

[SCG54-08] Fine-grained gabbroic layers in the lower and middle crustal sections of the Oman Ophiolite (Holes GT1A and GT2A), ICDP Oman Drilling Project

*Takashi Hoshide¹, Susumu Umino², Yuki Kusano³, Peter B Kelemen⁴, Damon A H Teagle⁵, Eiichi TAKAZAWA⁶, Jude Ann Coggon⁵, Katsuyoshi Michibayashi⁷, The Oman Drilling Project Phase1 Science Party⁸ (1.Faculty of International Resource Sciences, Akita University, 2.Kanazawa University, 3.Geological Survey of Japan, 4.Lamont-Doherty Earth Observatory, 5.Southampton University, 6.Niigata University, 7.Shizuoka University, 8.D/V CHIKYU)

2:30 PM - 2:45 PM

[SCG54-09] The PGE abundances and Os isotope ratios in gabbros from ICDP Oman drilling cores

*Ryoko Senda^1,2, Katsuhiko Suzuki², The Oman Drilling Project Phase I Science Party (1.Faculty of Social and Cultural Studies, Kyushu University, 2.JAMSTEC)

2:45 PM - 3:00 PM

[SCG54-10] Initial studies of the petrophysics in the dike and upper gabbro from ICDP Hole GT3A, the Oman Drilling Project Phase I

*Natsue Abe¹, Kohei Hatakeyama², Keishi Okazaki³, James Andrew Leong⁴, Yamato Tateishi⁵, Benoit Ildefonse⁶, Michelle Harris⁷, Katsuyoshi Michibayashi⁸, Juan Carlos de Obeso⁹, Damon A H Teagle¹⁰, Eiichi TAKAZAWA¹¹, Peter B Kelemen¹², Phase I Science Party The Oman Drilling Project¹³ (1.R&D Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology, 2.Hiroshima University, 3.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 4.Arizona State University, 5.Okayama University, 6.Université de Montpellier, 7.Plymouth University, 8.Shizuoka University, 9.Lamont -Doherty Earth Observatory, Columbia University, 10.University of Southampton, Ocean & Earth Science, National Oceanography Centre Southampton, 11.Niigata University, 12.Columbia University, 13.University of Southampton, Oman Drilling Project Office)

3:00 PM - 3:15 PM

[SCG54-11] Pressure dependence of elastic wave velocity in mafic rock cores collected from Oman Drilling Project Phase I

*Kohei Hatakeyama¹, Natsue Abe², Keishi Okazaki², Benoit Ildefonse³, Ikuo Katayama¹, The Oman Drilling Project Phase I Science Party (1.Hiroshima University , 2.JAMSTEC, 3.CNRS & Montpellier University)

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