Study on the mechanisms of biogenic basalt alteration by synchrotron-based X-ray microscopy
| Project/Area Number |
15H05330
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Ehime University |
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Principal Investigator |
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| Research Collaborator |
Makita Hiroko
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2016: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2015: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
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| Keywords | 海洋地殻 / 生物的風化 / XAFS / 鉄酸化反応 / バクテリア / 風化 / 微生物 / X線顕微鏡 / STXM / スペシエーション / 走査型透過X線顕微鏡 / バイオミネラル / 物質循環 / 鉄 / 玄武岩 / パイライト |
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| Outline of Final Research Achievements |
The weathering of oceanic basalt has a significant impact on Earth's climate on a geological timescale by providing a sink for atmospheric CO2 through carbonization of oceanic basalts. The fresh basalt rock contains abundant Fe and its major species is Fe(II). Recent previous studies have reported that oceanic microorganisms would play a significant role to the oxidation of Fe(II) in the basalt. In this study, we investigated the mechanisms of the biogenic Fe(II) oxidation in basalt weathering by synchrotron X-ray spectrocopic techniques. We appliyed the techniques into the basalt samples prepared by in situ incubation of fresh basalt at deep seafloor in Izu-Ogasawara bonin. Our analysis of the sample clearly showed that microbial Fe(II) oxidation is more rapid reaction than abiotic Fe(II) oxidation and that the biotic Fe(II) oxidation promotes the whole basalt weathering. These findings would be an important knowledge to understand mechanism of biogenic weathering of oceanic crust.
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| Academic Significance and Societal Importance of the Research Achievements |
上述の通り、海洋地殻である玄武岩の酸化風化は海洋のCO2固定を促進するため、地球規模の炭素循環を考える上でも重要な反応である。本研究では、ナノスケールの空間分解能を有する先端的X線顕微鏡を利用して、鉱物－微生物細胞界面における鉄、酸素、炭素の元素分布さらには化学種分析をおこない、海底下微生物が玄武岩風化を促進させる分子レベルでの証拠を得た。これらの知見は、地球規模の炭素循環に果たす海底下微生物の影響を再考するきわめて重要な知見となる。
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Report
(5 results)
Research Products
(12 results)
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[Journal Article] Significant contribution of subseafloor microparticles to the global2019
Author(s)
Uramoto Go-Ichiro, Morono Yuki, Tomioka Naotaka, Wakaki Shigeyuki, Nakada Ryoichi, Wagai Rota, Uesugi Kentaro, Takeuchi Akihisa, Hoshino Masato, Suzuki Yoshio,Shiraishi Fumito, Mitsunobu Satoshi, Suga Hiroki, Takeichi Yasuo, Takahashi Yoshio,Inagaki Fumio
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Journal Title
Nature Communications
Volume: 10
Pages: 400-400
Related Report
Peer Reviewed
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[Journal Article] Spatially resolved distribution of fe species around microbes at the submicron scale in natural bacteriogenic iron oxides.2017
Author(s)
Suga, H, Kikuchi, S, Takeichi, Y, Miyamoto, C, Miyahara, M, Mitsunobu, S, Ohigashi, T, Mase, K, Ono, K, Takahashi, Y
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Journal Title
Microbes & Environments
Volume: 32
Pages: 283-287
NAID
Related Report
Peer Reviewed
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[Journal Article] Comparative analysis of microbial communities in iron-dominated flocculent mats in deep-sea hydrothermal environments2016
Author(s)
Makita H, Kikuchi S, Mitsunobu S, Takaki Y, Yamanaka T, Toki T, Noguchi T, Nakamura K, Abe M, Hirai M, Yamamoto M, Uematsu K, Miyazaki J, Nunoura T, Takahashi Y, Takai K
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Journal Title
Applied & Environmental Microbiology
Volume: 82
Pages: 5741-5755
NAID
Related Report
Peer Reviewed
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[Journal Article] Direct Detection of Fe(II) in Extracellular Polymeric Substances (EPS) at the Mineral-Microbe Interface in Bacterial Pyrite Leaching2016
Author(s)
Mitsunobu S., Zhu M., Takeichi Y., Ohigashi T., Suga H., Jinno M., Makita H., Sakata M., Ono K., Mase K., Takahashi Y.
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Journal Title
Microbes and Environments
Volume: 31
Issue: 1
Pages: 63-69
DOI
NAID
ISSN
1342-6311, 1347-4405
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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