2011 Fiscal Year Final Research Report
Transportation process of transitional-metal elements by fluid and/or melt in the upper mantle beneath the arc
| Project/Area Number |
21740375
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kumamoto University (2011)
Kanazawa University (2009-2010) |
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Principal Investigator |
ISHIMARU Satoko 熊本大学, 大学院・自然科学研究科, 助教 (60464046)
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| Research Collaborator |
ARAI Shoji 金沢大学, 大学院・自然科学研究科, 教授 (20107684)
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| Project Period (FY) |
2009 – 2011
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| Keywords | マントル / 地球化学 / 沈み込み帯 / 交代作用 |
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| Research Abstract |
We examined two different types of mantle-derived peridotites to clarify modification processes, especially to transportation of transitional-metal elements, by melts or slab-derived fluids : the one is xenoliths from sub-arc mantle beneath the volcanic front and the other is solid intrusive peridotite blocks and peridotites at the bottom of Oman ophiolite. Then, we identified that the sub-arc mantle beneath the volcanic front is highly metasomatized and some elements(e. g., Ni, Fe and platinum-group elements) are partly concentrated in there. In addition, we found H_2O-bearing inclusions in sub-arc mantle xenoliths. However there have been quite a few reports of H_2O inclusions even in arc-derived materials, we confirmed that H_2O is the main fluid phase within the sub-arc upper mantle beneath the volcanic front.
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[Journal Article] Chemical characteristics of chromian spinel in plutonic rocks : implications for deep magma processes and discrimination of tectonic setting2011
Author(s)
Arai, S., Okamura, H., Kadoshima, K., Tanaka, C., Suzuki, K. and Ishimaru, S
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Journal Title
Island Arc
Volume: 20
Pages: 125-137
Peer Reviewed
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