2014 Fiscal Year Final Research Report
Does the Great Oxidation Event was instantaneous or episodic?
| Project/Area Number |
23340155
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Niigata University (2012-2014)
Shizuoka University (2011) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
外田 智千 国立極地研究所, 研究教育系, 准教授 (60370095)
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Keywords | 地質学 / 岩石・鉱物・鉱床学 / 安定同位体 / 硫黄同位体 / 太古代 |
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| Outline of Final Research Achievements |
Great Oxidation Event (GOE) is one of the most important events in the Earth history that shaped our planet to a habitable one. Here we have attempted to understand the processes that led to the increase of oxygen in the atmosphere during the period (3.0 to 2.5 Ga) just before the onset of GOE through a detailed geological, geochronological, geochemical and isotopic study of the Chitradurga Schist Belt in Western Dharwar Craton, India. Mass independent fractionation using multiple sulfur isotope studies combined with carbon, oxygen isotopes and strontium and neodymium isotopes revealed the possibility of episodic oxygen pulses to the atmosphere, rather than an instantaneous increase. Comparison of newly obtained data with those from other terranes were also carried out in this study, which supported out conclusion.
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| Free Research Field |
数物系科学
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