1997 Fiscal Year Final Research Report Summary
Study on the transport mechanism of chemical substances to the deep sea above the 5m of continental shelf slope at the Japan Trench
| Project/Area Number |
08554019
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
地球化学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
NORIKI Shinichiro Hokkaido Univ., Grad.School of Env.Earth Sci., Pro., 大学院地球環境科学研究科, 教授 (80109511)
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| Co-Investigator(Kenkyū-buntansha) |
NARITA Hisashi Hokkaido Univ., Grad.School of Env.Earth Sci., Inst., 大学院地球環境科学研究科, 助手 (50250501)
ISODA Yutaka Hokkaido Univ., Fac.of Fish., Asso.Pro., 水産学部, 助教授 (10193393)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Sediment trap / Horizontal transport / Rare earth elements / Aluminum / Japan Trench |
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| Research Abstract |
Five time-series sediment traps were moored at Hidaka Basin (41ﾟ28'N,142ﾟ29'E,Water Depth 1.4km ; June/96-June/97) and northern Japan Trench (40ﾟ29'N,144ﾟ31'E,Water Depth 7.3km ; June/96-July/97). Settling particles collected with sediment traps were analyzed for aluminum, opal, calcium carbonate, manganeses and rare earth elements, especially La and Yb.
Aluminum flux increased with depth at the station of Japan Trench. The particle collected at 1.2km depth in summer season was rich in Mn at the station of Hidaka Basin. The high Mn/Al particles were found at the deeper depth of the station of Japan Trench. The [Yb/La] of the particle at 1km depth of Japan Trench was similar to that of Asian continental dust, while the [Yb/La] of the particles at 6.7km depth was similar to that of Japan Island crust.
These results indicate that lithogenic aluminosilicate are vertically and horizontally transported from coastal region to the deep Japan Trench above the continental shelf slope.
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