| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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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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