2016 Fiscal Year Final Research Report
Tracing water cycling in the mantle by volatile tracers in micro-inclusions in mantle-derived minerals
| Project/Area Number |
26287139
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
水上 知行 金沢大学, 自然システム学系, 助教 (80396811)
WALLIS R・Simon 名古屋大学, 環境学研究科, 教授 (30263065)
鍵 裕之 東京大学, 理学(系)研究科(研究院), 教授 (70233666)
石丸 聡子 熊本大学, 自然科学研究科, 助教 (60464046)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | ハロゲン / 希ガス / 水 / 沈み込み / マントル / スラブ流体 / 質量分析 / 中性子照射 |
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| Outline of Final Research Achievements |
Noble gases, halogens, calcium, potassium, barium, uranium in mantle peridotites from subduction zones and continental regions, exhumed metamorphic rocks derived from subducted slabs, and diamonds were simultaneously determined by using a combination of neutron-irradiation and high-sensitive noble gas mass spectrometry. The ubiquitous occurrence of sedimentary-pore-fluid-like subduction fluids associated with a small contribution of components of sediment or altered oceanic crust is best explained by a model where water with a pore-fluid signature is incorporated into subducting oceanic lithosphere as serpentine along fracture zones developed at the outer rise without significant modification in the halogen and noble gas compositions. The halogen and noble gas compositions of mantle peridotites from continental regions demonstrate that the influence of subduction driven metasomatism still remains beneath former subduction zones.
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| Free Research Field |
同位体地球化学
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