| Project/Area Number |
26400526
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
USHIKUBO Takayuki 国立研究開発法人海洋研究開発機構, 高知コア研究所, 技術研究員 (10722837)
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| Co-Investigator(Renkei-kenkyūsha) |
IIZUKA Tsuyoshi 東京大学, 理学系研究科, 准教授 (70614569)
ITO Motoo 国立研究開発法人海洋研究開発機構, 高知コア研究所, 主任技術研究員 (40606109)
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| Research Collaborator |
SHIMIZU Kenji 国立研究開発法人海洋研究開発機構, 高知コア研究所, 技術研究員
TANI Kenichiro 国立科学博物館, 地学研究部, 研究員
VALLEY John W. University of Wisconsin-Madison, Department of Geoscience, Professor
SPICUZZA Michael J. University of Wisconsin-Madison, Department of Geoscience, Senior Scientist
GEORG R. Bastian Trent University, Water Quality Center, Senior Research Scientist
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | ジルコン / 太古代 / 大陸地殻 / 酸素同位体 / SIMS / 揮発性元素 |
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| Outline of Final Research Achievements |
(1) We developed an in situ, high precision oxygen isotope analysis technique with 10 micrometer in diameter primary beam by SIMS. We measured oxygen isotope ratios of zircons recovered from ca. 4.0 to 3.6 Ga Felsic Gneisses of Acasta Gneiss Complex in Canada, and felsic rocks of the Izu-Bonin-Mariana (IBM) Arc of the western Pacific. We found occurrence of moderately elevated oxygen isotope ratios of zircons from both sites, indicating increase of oxygen isotope ratios of parent magmas in association with continental crustal felsic rocks.
(2) We developed in situ analysis techniques of volatile elemental abundances and hydrogen isotope ratios of glass. With these analytical techniques, we recognized that fresh volcanic glasses and melt inclusions in olivine phenocrysts from IBM arc and ocean island basalts preserved pristine signatures of igneous fractionation and change of supplied fluid from subducted materials.
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