2011 Fiscal Year Final Research Report
Petrological processes of Moho formation
Project/Area Number |
20244085
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Petrology/Mineralogy/Science of ore deposit
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Research Institution | Kanazawa University |
Principal Investigator |
ARAI Shoji 金沢大学, 自然システム学系, 教授 (20107684)
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Project Period (FY) |
2008 – 2011
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Keywords | モホ / マントル / 地殻 / 海洋底 / オフィオライト / 島弧 / 捕獲岩 |
Research Abstract |
Petrologic nature of Moho(Mohorovicic discontinuity), the shallowest of global physical discontinuities of the Earth's interior) has been investigated. Results of this study will guide the oceanic mantle drilling(Mohole) in the future. In the Oman ophiolite, a slice of Cretaceous oceanic lithosphere, the Mono transition zone(=MTZ), from 10 m to 1 km in thickness, is found between layered gabbro and the mantle peridotite(mainly harzburgite). The MTZ, mainly composed of dunites and wehrlites, becomes Mg-rich with an increase of its thickness, showing characteristics of a MORB/harzburgite reaction product. Beneath the island arc, the MTZ varies its petrologic characteristics through accretion of cumulates and hydration, and shows intense heterogeneities and varieties.
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Research Products
(71 results)
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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
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[Journal Article] Igneous, alteration and exhumation processes recorded in abyssal peridotites and related fault rocks from an oceanic core complex along the Central Indian Ridge2009
Author(s)
Morishita, T., Hara, K., Nakamura, K., Sawaguchi, T., Tamura, A., Arai, S., Okino, K., Takai, K. and Kuragai, H.
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Journal Title
Journal of Petrology
Volume: 50
Pages: 1299-1325
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[Journal Article] Rock seismic anisotropy of the low-velocity zone beneath the volcanic front in the mantle wedge2009
Author(s)
Michibayashi, K., Oohara, T., Satsukawa, T., Ishimaru, S., Arai, S. and Okrugin, V. M.
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Journal Title
Geophysical Research Letters
Volume: 36
Pages: L12305
DOI
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[Journal Article] Intergranular trace elements in mantle xenoliths from Russian Far East : An example for mantle metasomatism by hydrous melt2009
Author(s)
Yamamoto, J., Nakai, S., Nishimura, K., Kaneoke, I., Kagi, H., Sato, K., Okumura, T., Prikhod' ko and Arai, S.
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Journal Title
Island Arc
Volume: 18
Pages: 225-241
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[Journal Article] Petrology of the Yugu peridotites in the Gyeonggi massif, South Korea : implications for their origin and hydration process2008
Author(s)
Arai, S., Tamura, A., Ishimaru, S., Kadoshima, K., Lee, Y.-I. and Hisada, K.
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Journal Title
Island Arc
Volume: 17
Pages: 485-501
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