Deciphering surface environment in the late Proterozoic using Re-Os measurement.
| Project/Area Number |
24840021
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Geology
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
SAWAKI Yusuke 東京工業大学, 理工学研究科, 助教 (00635063)
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| Project Period (FY) |
2012-08-31 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 後期原生代 / レニウム・オスミウム / Sulfidic / 南中国三峡地域 / 南中国 / ReOsアイソクロン / 黒色頁岩 |
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| Research Abstract |
Global correlation of Precambrian stratigraphic successions can be conducted by the coarse resolution off biostratigraphic and chemostratigraphic records, because of the scarcity of precise U-Pb zircon dating. Re-Os isotope systems of organic matter-rich black shales became one of the reliable indicators of the depositional age, due to the recent developments in Re-Os analysis.
Rock powders were prepared from drill-core collected at Three Gorge, South China. Re and Os isotopic compositions were measured by TIMS at JAMSTEC. The 187Re/188Os and 187Os/188Os ratios of the black shales show linearity in the isochron plot. The model 3 isochron ages were 578 Ma (error is 12 Ma) for the black shale at the lower Member 4 of the Doushantuo Fm, with initial 187Os/188Os ratios of 1.02 (2SD=0.09). The Re-Os isochron plot for all analyses yields an age of 512 (error is 12 Ma) for the black shale at the bottom of the Shuijingtuo Fm, with initial 187Os/188Os ratios of 1.15 (2SD=0.19).
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Report
(3 results)
Research Products
(40 results)
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[Journal Article] New chronological constraints for Cryogenian to Cambrian rocks in the Three Gorges, Weng’an and Chengjiang areas, South China2014
Author(s)
Okada, Y., Sawaki, Y., Komiya, T., Hirata, T., Takahata, N., Sano, Y., Han, J., Maruyama, S.
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Journal Title
Gondwana Research
Volume: 25
Issue: 3
Pages: 1027-1044
DOI
Related Report
Peer Reviewed
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[Journal Article] In-situ analyses of phosphorus contents of carbonate minerals: Reconstruction of phosphorus contents of seawater from the Ediacaran to early Cambrian2014
Author(s)
Shimura, T., Kon, Y., Sawaki, Y., Hirata, T., Han, J., Shu, D., Komiya, K.
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Journal Title
Gondwana Research
Volume: 25
Issue: 3
Pages: 1090-1107
DOI
Related Report
Peer Reviewed
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[Journal Article] Zircon U-Pb dating from the mafic enclaves in the Tanzawa Tonalitic Pluton, Japan: Implications for arc history and formation age of the lower-crust2014
Author(s)
Suzuki, K., Yamamoto, S., Sawaki, Y., Aoki, K., Omori, S., Kon, Y., Hirata, T., Li, Y., Takaya, Y., Fujinaga, K., Kato, Y., Maruyama, S.
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Journal Title
Lithos
Volume: 196-197
Pages: 301-320
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Accreted Kula plate fragment at 94 Ma in the Yokonami-melange, Shimanto-belt, Shikoku, Japan2014
Author(s)
Saito, T., Okada, Y., Fujisaki, W., Sawaki, Y., Sakata, S., Dohm, J., Maruyama, S., Hirata, T.
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Journal Title
Tectonophysics
Volume: 623
Pages: 136-146
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Initiation of leaking Earth: An ultimate trigger of the Cambrian explosion2013
Author(s)
Maruyama, S., Sawaki, Y., Ebisuzaki, T., Ikoma, M., Omori, S., Komabayashi, T.
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Journal Title
Gondwana Research
Volume: 25
Issue: 3
Pages: 910-944
DOI
Related Report
Peer Reviewed
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