Subduction zone fluids: Chemistry of saline fluids transferring from the ocean to the mantle wedge through the downgoing slab
| Project/Area Number |
24340134
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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 |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MIBE KENJI 東京大学, 地震研究所, 助教 (10372426)
YAMAMOTO JUNJI 北海道大学, 総合博物館, 准教授 (60378536)
ISHIMARU SATOKO 熊本大学, 大学院自然科学研究科, 助教 (60464046)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2013: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2012: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Keywords | 沈み込み帯 / 水流体 / マグマ / 海水 / 塩水 / 二酸化炭素 / 元素分配 / 高温高圧実験 / スラブ / マントルウェッジ / 流体包有物 / 放射光蛍光X線 / 塩濃度 / 水 / 分配係数 / 火山 / 温泉 / 蛇紋石 / マントル捕獲岩 / マントル交代作用 / 超臨界流体 / 堆積岩 |
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| Outline of Final Research Achievements |
1) The inclusions in the Ichinomegata amphibole bearing spinel plagioclase lherzolite xenoliths were found to be composed mainly of CO2-H2O-Cl-S fluids. The salinity of fluid inclusions is 3.7±0.8 wt% NaCl equivalent. The salinity of aqueous fluid inclusions in jadeite-rich rocks in supra subduction zone is 4.3 wt% NaCl equivalent.
2) Partitioning of large ion lithophile elements between aqueous fluids and melts was measured using in-situ synchrotron x-ray fluorescence (XRF) from aqueous fluids and silicate melts at high-temperature and high-pressure conditions. We found a positive correlation between partition coefficients and pressure, as well as between partition coefficients and salinity. Enrichment of large ion lithophile elements in arc basalts relative to mid oceanic ridge basalts has been attributed to the mantle source fertilization by aqueous fluids from dehydrating oceanic plate. Such aqueous fluids are likely to contain Cl, although their amount remains to be quantified.
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Report
(5 results)
Research Products
(41 results)
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[Journal Article] Large ion lithophile elements delivered by saline fluids to the sub-arc mantle2014
Author(s)
Kawamoto, T., Mibe, K., Bureau, H., Reguer, S., Mocuta, C., Kubsky, S., Thiaudiere, D., Ono, S., Kogiso, T.
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Journal Title
Earth, Planets and Space
Volume: 66
Issue: 1
Pages: 61-61
DOI
NAID
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Presentation] Mantle Metasomatism in Subduction Zone and Intraplate Settings Based on Halogen and Noble Gas Systematics2015
Author(s)
Kobayashi M, Sumino H, Nagao K, Burgess R, Ishimaru S, Arai S, Yoshikawa M, Kawamoto T, Kumagai Y, Kobayashi T, Nakamura M, Takahashi E & Ballentine C
Organizer
Goldschmidt conference
Place of Presentation
Prague conference center, Czech Republic
Year and Date
2015-08-21
Related Report
Int'l Joint Research
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[Presentation] 塩水が島弧下マントルへイオン半径の大きい親石元素を運ぶ2014
Author(s)
川本竜彦, 三部賢治, Bureau Helene, Reguer Solenn, Mocuta Cristian, Kubsky Stefan, Thiaudiere Dominique, 小野重明, 小木曽哲
Organizer
日本鉱物科学会
Place of Presentation
熊本大学
Year and Date
2014-09-19
Related Report
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[Presentation] スラブ流体は塩水2014
Author(s)
川本竜彦
Organizer
日本地球惑星科学連合2014年大会
Place of Presentation
横浜市パシフィコ横浜
Year and Date
2014-05-02
Related Report
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