Significance of of-axis magmatism for the accretion of oceanic crustal
| Project/Area Number |
23540530
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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 |
Geology
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| Research Institution | Niigata University |
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Principal Investigator |
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| Research Collaborator |
KANEKO Rhu 新潟大学, 自然科学研究科
KUSANO Yuki 金沢大学, 理工研究域, 博士研究員
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 海洋地殻 / 海嶺 / オフィオライト / オマーン / オフアクシス火成活動 / 海嶺セグメント / マグマ / オマーンオフィオライト |
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| Outline of Final Research Achievements |
Detailed volcanic stratigraphy in the Oman ophiolite exhibits lava accretion processes around fast-spreading ridges. The V1 sequence is divided into the lower V1 (LV1) and upper V1 (UV1) by 0.4-m thick umber layer. The lowest part of the LV1 consists of lobate sheet and pillow lava flows extruded on the flat ridge crest. Elongate pillows occurred at 230 mab (meters above the base of the extrusives) is originated from flowing down lavas and characterizes ridge frank. Accretion process at the off-axis area is recorded in the UV1 consisting of pahoehoe flows, lobate sheet flows and pillow lavas. Depleted lavas covering the 0.4-m thick umber suggest that these lavas derived from more depleted mantle source or underwent higher degree of partial melting. Because the depleted lavas are covered repeatedly by evolved lavas with similar compositions to lava in the LV1, the off-axis lava sequence should be pileup of lava flows erupted at off-axis and transported from ridge axis, repeatedly.
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Report
(5 results)
Research Products
(52 results)
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[Journal Article] Origin of large wehrlitic intrusions found from Wadi Barghah to Salahi area in the northern Oman ophiolite2014
Author(s)
Kaneko, K., Adachi, Y. and Miyashita, S.
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Journal Title
Tectonic Evolution of the Oman Mountains (Geological Society, London, Special Publications) (In Rollinson, H.R., Searle, M.P., Abbasi, I.A., Al-Lazki, A. and Al Kindi, M.H. (eds.))
Volume: 392
Issue: 1
Pages: 205-220
DOI
Related Report
Peer Reviewed
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[Journal Article] Evolution of volcanism and magmatism during initial arc stage: constraints on the tectonic setting of the Oman Ophiolite. In Rollinson, H.R., Searle, M.P., Abbasi, I.A., Al-Lazki, A. and Al Kindi, M.H. (eds.), Tectonic Evolution of the Oman Mountains2014
Author(s)
Kusano, Y. Hayashi, M., Adachi, Y., Umino, S. and Miyashita, S.
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Journal Title
Geological Society, London, Special Publications
Volume: 392
Issue: 1
Pages: 177-193
DOI
Related Report
Peer Reviewed
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[Journal Article] Petrology of Lasail plutonic complex, northern Oman ophiolite, Oman: An example of arc-like magmatism associated with ophiolite detachment2013
Author(s)
Tsuchiya, N., Shibata, T., Yoshikawa, M., Adachi, Y., Miyashita, S., Adachi, T., Nakano, N., Osanai, Y.
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Journal Title
Lithos
Volume: 156-159
Pages: 120-138
DOI
Related Report
Peer Reviewed
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