R7: Petrology, Mineralogy and Economic geology (Joint session with SRG)

[R7-02] Petrological and geophysical implications for Mado Megamullion, Philippine Sea

*Norikatsu Akizawa¹, Kyoko Okino¹, Osamu Ishizuka², Hiroyuki Yamashita³, Shiki Machida⁴, Ohara Yasuhiko^5,6 (1. AORI, The Univ. Tokyo, 2. GSJ, 3. Kanagawa Prefectural Museum of Natural History, 4. Chiba Institute of Technology, 5. Japan Coadt Guard, 6. JAMSTEC)

Keywords:Peridotite, Gabbro, Whole-rock chemistry, Gravity data, Oceanic Core Complex

The oceanic core complex is one of the best sampling locality, where we can collect peridotite samples to reveal mantle process. However, we cannot eveluate the mantle process unless we disclose the history that the mantle peridotite had passed through. We aim at reporting how the mantle peirdotites exhumed to the seafloor, and how large they expose on the seafloor, using petrological and geophysical approaches. Here, we present petrological characteritics and whole-rock compositions of the peridotitic samples (17) and gabbroic-dolelitic samples (13) as well as gravity data set.