2016 Fiscal Year Final Research Report
Exploration of recycled crustal materials in kimberlites: An integrated study of eclogitic diamonds and zircons
| Project/Area Number |
26610163
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Tohoku University (2015-2016)
Okayama University (2014) |
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Principal Investigator |
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| Research Collaborator |
Malkovets Vladimir
Stern Robert
Liou John G.
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | キンバレー岩 / ダイヤモンド / Ｅ型ダイヤモンド / ざくろ石 / 超高圧変成作用 / 超高圧鉱物 / シベリア地塊 / ロシア |
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| Outline of Final Research Achievements |
E-type diamonds (eclogitic diamonds) from Siberian kimberlites were investigated. Rare garnet inclusions do not contain major-like component, suggesting that the diamond-formation in lithospheric mantle was not in ‘super deep’ environment. Zircons from the kimberlites were also not recycled crustal material; they essentially formed during kimberlitic igneous activity. Age distribution of world-wide kimberlites, combined with other large-scale petrotectonic indicators suggest that plate underflow since the onset of modern-style plate tectonics about 1 Ga has massively increased mantle CO2 and H2O contents, leading to the rapid and explosive ascent of diamond-bearing kimberlite magmas.
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| Free Research Field |
地質学
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