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

Mon. May 21, 2018 9:00 AM - 10:30 AM 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:Teagle Damon(Ocean & Earth Science, National Oceanography Centre Southampton, University of Southampton), Takazawa Eiichi(Niigata 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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9:00 AM - 9:15 AM

[SCG54-01] X-ray CT core imaging of Oman Drilling Project on D/V CHIKYU

*Katsuyoshi Michibayashi^1,14, Keishi Okazaki², James Andrew Monton Leong³, Peter B Kelemen⁴, Kevin Johnson⁵, Rebecca N Greenberger⁶, Craig E Manning⁷, Michelle Harris⁸, Juan Carlos de Obeso⁴, Natsue Abe², Kohei Hatakeyama⁹, Benoit Ildefonse¹⁰, Eiichi TAKAZAWA¹¹, Damon A H Teagle¹², Jude Ann Jude¹², The Oman Drilling Project Phase I Science Party¹³ (1.Shizuoka University, 2.JAMSTEC, 3.Arizona State University, 4.Columbia University, 5.University of Hawaii at Manoa, 6.California Institute of Technology, 7.University of California at Los Angeles, 8.Plymouth University, 9.Hiroshima University, 10.Universite de Montpellier, 11.Niigata University, 12.University of Southampton, 13.D/V Chikyu (JAMSTEC), 14.Nagoya University)

9:15 AM - 9:30 AM

[SCG54-02] Mantle Wedge Metasomatic Hydration; Evidence from the Khantaishir Ophiolite, Western Mongolia

*OTGONBAYAR DANDAR¹, Atsushi Okamoto¹, Masaoki Uno¹, Noriyoshi Tsuchiya¹ (1.Graduate School of Environmental Studies, Tohoku University)

9:30 AM - 9:45 AM

[SCG54-03] Ordovician mantle dynamics in NE-Japan constraints from layered structures of Cumulate Member in the Hayachine-Miyamori Ophiolite

*Takafumi Kimura¹, Kazuhito Ozawa¹, Tsuyoshi Iizuka¹ (1.Department of Earth and Planetary Science, The University of Tokyo)

9:45 AM - 10:00 AM

[SCG54-04] Feasibility of IODP drilling at the Godzilla Megamullion

*Yasuhiko Ohara^1,2, Katsuyoshi Michibayashi³, Henry JB Dick⁴, Jonathan E Snow⁵, Yumiko Harigane⁶, Shigeaki Ono² (1.Hydrographic and Oceanographic Department of Japan, 2.Japan Agency for Marine-Earth Science and Technology, 3.Shizuoka University, 4.Woods Hole Oceanographic Institution, 5.University of Houston, 6.Geological Survey of Japan)

10:00 AM - 10:15 AM

[SCG54-05] Crustal and upper mantle structure deduced from seismic refraction and reflection data on the Northeast Hawaiian arch

*Akane Ohira^1,2, Shuichi Kodaira^1,2, Gregory F Moore³, Mikiya Yamashita², Kiyoshi Suyehiro², Kyaw Moe², Toshiya Fujiwara², Yuka Kaiho², Seiichi Miura², Gou Fujie², Yasuyuki Nakamura², Susumu Umino⁴, Americus dC Perez⁴, Yuki Kusano⁵ (1.Yokohama National University, 2.JAMSTEC, 3.University of Hawaii, 4.Kanazawa University, 5.AIST)

10:15 AM - 10:30 AM

[SCG54-06] Structural characteristics of oceanic plate in the east off Hawaiian islands, central Pacific obtained by the site survey for uppermost mantle drilling

★Invited Papers

*Mikiya Yamashita¹, KYAW MOE¹, Kiyoshi Suyehiro¹, Shuichi Kodaira¹, Akane Ohira¹, Seiichi Miura¹, Gregory F Moore² (1.Japan Agency for Marine-Earth Science and Technology, 2.University of Hawaii)

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