Establishing a new method for Cr isotopes to understand redox change of seawater in the geological pasts
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 |
Research Field |
Stratigraphy/Paleontology
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Research Institution | Japan Agency for Marine-Earth Science and Technology |
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 |
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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Report
(4 results)
Research Products
(32 results)
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[Journal Article] Data report: Volcanic glass shards from Eocene-Oligocene transition interval at Site U1333, In Palike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists2013
Author(s)
Junichiro Kuroda and Thomas Westerhold, Data report : Volcanic glass shards from Eocene-Oligocene transition interval at Site U1333, In Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists
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Journal Title
Proceedings of the Integrated Ocean Drilling Program, Tokyo (Integrated Ocean Drilling Program Management International, Inc.)
Volume: vol. 320/321
Related Report
Peer Reviewed
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[Journal Article] Lead isotopic record of Barremian -Aptian marine sediments: Implications for large igneous provinces and the Aptian climatic crisis2011
Author(s)
Kuroda, J., Tanimizu, M., Hori, R.S., Suzuki, K., Ogawa, N.O., Tejada, M.L.G., Coffin, M.F., Coccioni, R., Erba, E., and Ohkouchi, N.
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Journal Title
Earth and Planetary Science Letters
Volume: 307
Issue: 1-2
Pages: 126-134
DOI
Related Report
Peer Reviewed
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[Presentation] Sedimentary osmium isotopic records of Mediterranean basins2013
Author(s)
Junichiro Kuroda, Francisco J. Jimenez-Espejo, Tatsuo Nozaki, Katsuhiko Suzuki
Organizer
2013 Goldschmidt Conference
Place of Presentation
Firenze Fiera Congress and Exhibition Centre, Florence, Italy ((Abstract in : Mineralogical Magazine, vol. 77, no. 5, p. 1526))(doi:10.1180/minmag.2013.077.5.11)
Year and Date
2013-08-28
Related Report
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[Presentation] Meteorite impact, volcanism, and radiolarian faunal turnover recorded in the Upper Triassic of Japan2013
Author(s)
Tetsuji Onoue, Honami Sato, Tatsuo Nozaki, Junichiro Kuroda, Katsuhiko Suzuki
Organizer
2013 Goldschmidt Conference
Place of Presentation
Firenze Fiera Congress and Exhibition Centre, Florence, Italy ((Abstract in : Mineralogical Magazine, vol. 77, no. 5, p. 1893))(doi:10.1180/minmag.2013.077.5.15)
Year and Date
2013-08-27
Related Report
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