| Project/Area Number |
26800278
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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 |
Geochemistry/Cosmochemistry
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| Research Institution | University of Tsukuba |
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Principal Investigator |
SAKAGUCHI Aya 筑波大学, 数理物質系, 准教授 (00526254)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | HFS元素 / 鉄マンガンクラスト / Zr / Hf / 放射性トレーサー / ジルコニウム / ハフニウム / DFO / XAFS |
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| Outline of Final Research Achievements |
In this study, we have attempted to clarify the accumulation/fractionation mechanisms of “geochemical twin” Zr and Hf in ferromanganese crusts (FMCs) by performing sequential extraction and DFO complexed radio-Zr and radio Hf adsorption experiments, wchich includes XAFS analysis for synthesised and natural samples.The their KDs between natural FMCs and seawater were around 10^8, and their ratios were fractionated compared to that of seawater. The observed Zr chemical states in FMCs resembled that for coprecipitation with ferrihydrite, coprecipitation with d-MnO2 and a basalt-like composition, although the results of sequential extraction showed that Zr and Hf existed predominantly in the Fe fraction. In the case of the adsorption experiments for DFO-Zr and DFO-Hf to ferrihydrite and d-MnO, it was found that the Hf-DFO underwent more adsorption on both minerals than Zr-DFO. The observed bond length of Hf-O was slightly shorter than that of Zr-O in the synthesised minerals.
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