| Project/Area Number |
25400492
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Fukada Geological Institute |
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Principal Investigator |
Ishii Teruaki 公益財団法人深田地質研究所, その他部局等, 研究員 (80111582)
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| Co-Investigator(Kenkyū-buntansha) |
Ohara Yasuhiko 国立研究開発法人海洋研究開発機構, 深海地殻内生物圏研究分野, 招聘主任研究員 (10470121)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 南部マリアナ海溝 / 海底地質断面 / 蛇紋岩冷湧水系 / 南東マリアナ前弧リフト / しんかい湧水域 / 深海生物群集 / 橄欖岩海嶺 / ブルーサイトチムニー / 冷湧水性チムニー / シロウリガイ / チューブワーム / マントル橄欖岩 / マントルかんらん岩 / 海溝陸側斜面 / 炭酸塩チムニー / シロウリガイコロニー / Shinnkai Seep Field / Shinkai Seep Field |
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| Outline of Final Research Achievements |
The 3000 km long Izu-Bonin-Mariana (IBM) arc system is an outstanding example of a nonaccretionary intraoceanic convergent plate margin. The trench inner wall (forearc) exposes so similar lithologies found in many land ophiolites, the igneous rocks exposed in the IBM forearc represents an in situ supra-subduction zone ophiolite. Along the southern Mariana trench inner wall (forearc), we have been investigating using the DSV Shinkai 6500. The discovery includes (A) a very young volcanic region of forearc rifting unusually close to the trench axis in SSW of Guam; the Southeast Mariana Forearc Rift (SEMFR), (B) a serpentinite-hosted deep sea ecosystem near the Challenger Deep; the Shinkai Seep Field (SSF), (C) a very shallow peridotite ridge consists of fresh mantle rocks, near trench axis in west of the Challenger Deep, of which ridge may be induced by colliding Caroline Ridge.
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