2015 Fiscal Year Annual Research Report
海洋の生物地球化学循環を駆動する有機金属化合物の分子・原子レベル動態解析
| Project/Area Number |
26610187
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| Research Institution | The University of Tokyo |
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Principal Investigator |
吉村 寿紘 東京大学, 大気海洋研究所, 助教 (90710070)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 有機金属化合物 |
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| Outline of Annual Research Achievements |
海洋や海底堆積物中に存在する微量金属は海洋生物によって利用され生化学プロセスを駆動している。生物がもつ金属化合物を直接定量することができれば、海洋の生物地球化学サイクルを解析する新しい手法となることが期待される。陸域からの砕屑物の供給量が少ない西赤道太平洋で採取された堆積物試料について金属（鉄・亜鉛・銅・マンガン・モリブデン）濃度測定とSr放射性同位体比（87Sr/86Sr）による年代を決定した。また、湿式分離によって抽出した脂質、タンパク質、色素などの画分について誘導結合プラズマ質量分析装置での金属濃度の測定を行った。また、有機物濃度が非常に高い海水の濃縮塩田に発達した微生物マットおよび、その関連堆積物について金属の化学形態分析を実施し、化学形態のその場分析を行い試料の堆積環境に関する知見を得た。
The amount of bioessential trace metals play a key role in marine biogeochemical processes as a limiting factor for vital reactions. Quantitative analysis of metal-bearing compounds may be able to indicate in situ proxy for biological activity. I measured down-core data of bioessential metals (Fe, An, Cu, Mn, Mo), and radiogenic Sr isotope ratios in a Quaternary sediment core recovered from the West Caroline Basin in the western equatorial Pacific. Following chromatographic separation of lipid, protein, and pigment fractions, metal concentrations were measured with ICP-MS. I also measured dense benthic microbial mat of solar salterns which harbor surprisingly diverse microorganisms. The in situ geochemical signatures of salt deposits allows proposing a past depositional environment with marked impact on the benthic biota of the depositional basin.
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Research Products
(7 results)
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[Journal Article] An X-ray spectroscopic perspective on Messinian evaporite from Sicily: sedimentary fabrics, element distributions, and chemical environments of S and Mg2016
Author(s)
Toshihiro Yoshimura, Junichiro Kuroda, Stefano Lugli, Yusuke Tamenori, Nanako O. Ogawa, Francisco J. Jiménez-Espejo, Yuta Isaji, Marco Roveri, Vinicio Manzi, Hodaka Kawahata, Naohiko Ohkouchi
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Journal Title
Geochemistry Geophysics Geosystems
Volume: 17
Pages: 1-18
DOI
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Effect s of increasing salinity on the biogeochemical cycle of the hypersaline bio mat: Insights from the isotop ic composition of pigments2016
Author(s)
Yuta Isaji, Hodaka Kawahata, Junichiro Kuroda, Toshihiro Yoshimura, Nanako O. Ogawa, Atsushi Suzuki, Takazo Shibuya, Stefano Lugli, Yusuke Tamenori, Nanako O. Ogawa, Francisco J. Jimenez-Espejo, Stefano Lugli, Vinicio Manzi, Marco Roveri, Naohiko Ohkouchi
Organizer
26th Goldschmidt Conference
Place of Presentation
パシフィコ横浜、横浜市
Year and Date
2016-06-26 – 2016-07-01
Int'l Joint Research
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[Presentation] Carbon and nitrogen stable isotope measurements and X-ray photoabsorption spectroscopy of microbial-mat-containing gypsum crust in modern saline pan2015
Author(s)
Yuta Isaji, Hodaka Kawahata, Toshihiro Yoshimura, Junichiro Kuroda, Nanako O. Ogawa, Atsushi Suzuki, Takazo Shibuya, Stefano Lugli, Yusuke Tamenori, Nanako O. Ogawa, Francisco J. Jimenez-Espejo, Stefano Lugli, Vinicio Manzi, Marco Roveri, Yusuke Tamenori, Naohiko Ohkouchi
Organizer
European Geosciences Union General Assembly 2015
Place of Presentation
ウィーン、オーストリア
Year and Date
2015-04-12 – 2015-04-17
Int'l Joint Research
