| Project/Area Number |
23740387
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
KURODA Junichiro 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 主任研究員 (10435836)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 古海洋 / クロム同位体 / 酸化還元変動 / 白亜紀 / 海洋無酸素事変 / 酸化還元電位 |
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| Research Abstract |
During the two years, I have established a new method to separate Cr from sedimentary rocks deposited in the geological past to measure Cr isotopes which could be a new indicator of oxic-anoxic condition of seawater in the deep time. I measured major, trace and rare earth element concentrations as well as Cr isotopic compositions of carbonate rocks of Lower Cretaceous sediments from Mid-Pacific Mountains. I compared chemical compositions of carbonate between deep pelagic chalk from DSDP Site 463, and shallow water limestone from ODP Site 866 on Resolution Guyot. My data track a stratigraphic interval representing Oceanic Anoxic Event (OAE)-1a of early Aptian time, characterised by an almost synchronous global deposition of organic carbon-rich black shale. The data suggest that seawater chemistry have changed a few hundred of thousand years before OAE-1a.
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