Exploration of recycled crustal materials in kimberlites: An integrated study of eclogitic diamonds and zircons
| Project/Area Number |
26610163
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Tohoku University (2015-2016)
Okayama University (2014) |
|---|
Principal Investigator |
|
|---|
| Research Collaborator |
Malkovets Vladimir
Stern Robert
Liou John G.
|
|---|
| Project Period (FY) |
2014-04-01 – 2017-03-31
|
| Project Status |
Completed (Fiscal Year 2016)
|
| 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)
|
|---|
| 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 |
|---|
| 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.
|
Report
(4 results)
Research Products
(9 results)
