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学科主题: Geochemistry & Geophysics
题名: Zircon and apatite thermochronology of the Nankai Trough accretionary prism and trench, Japan: Sediment transport in an active and collisional margin setting
作者: [Clift, Peter D.] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70809 USA ; [Clift, Peter D.] Chinese Acad Sci, Key Lab Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China ; [Carter, Andrew] Univ London Birkbeck Coll, Dept Earth & Planetary Sci, London WC1E 7HX, England ; [Nicholson, Uisdean] Shell Int Explorat & Prod, The Hague, Netherlands ; [Masago, Hideki] Japan Agcy Marine Earth Sci & Technol, Ctr Deep Earth Explorat, Yokohama, Kanagawa, Japan
通讯作者: pclift@lsu.edu
关键词: Fission track ; zircon ; provenance ; Subduction ; Yangtze
刊名: TECTONICS
发表日期: 2013
卷: 32, 期:3, 页:377-395
部门归属: 海洋地质
资助者: We wish to thank the Natural Environment Research Council (NERC) and UK Integrated Ocean Drilling Program for financial support for this project. P.C. and U.N. thank the University of Aberdeen for their help and support during the early stages of this project when both authors were members of the School of Geosciences. This paper benefited from comments by editor Todd Ehlers, associate editor Paul Kapp, and reviewer Gaku Kimura.
摘要: The Nankai accretionary complex is the most recent addition to the accretionary complexes of southwest Japan and has preserved a record of sediment flux to the trench during its construction. In this study, we use U-Pb zircon and fission track analysis of both zircons and apatites from sediments taken from the forearc and trench of the Nankai Trough, as well as rivers from southwest Japan to examine the exhumation history of the margin since the Middle Miocene. Modern rivers show a flux dominated by erosion of the Mesozoic-Eocene Shimanto and Sanbagawa accretionary complexes. Only the Fuji River, draining the collision zone between the Izu and Honshu arcs, is unique in showing much faster exhumation. Sediment from the Izu-Honshu collision is not found 350-500km along the margin offshore Kyushu indicating limited along-strike sediment transport. Sediment deposited since 2Ma on the midtrench slope offshore the Muroto Peninsula of Shikoku (ODP Site 1176) and on the lower slope trenchward of the Kumano Basin (IODP Sites C0006E and C00007E) shares the dominant source in the Shimanto and Sanbagawa complexes seen in the modern rivers. Prior to 5Ma, additional sediment was being sourced from further north in more slowly exhumed terrains, similar to 350km from the trench axis. Around 9.4Ma, U-Pb zircon ages of similar to 1800Ma indicate enhanced erosion from the North China Craton, exposed in northern Honshu. In the middle Miocene, at similar to 15.4Ma, the sediment was being derived from a much wider area including the Yangtze Craton (U-Pb ages similar to 800Ma). We suggest that this enhanced catchment may have reflected the influence of the Yangtze River in supplying into the Shikoku Basin prior to rifting of the Okinawa Trough at 10Ma and migration of the Palau-Kyushu Ridge to form a barrier to transport. The restriction of Nankai Trough provenance to Mesozoic source partly reflects continued uplift of the Shimanto and Sanbagawa complexes since the Middle Miocene.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000322124300006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11127
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Clift, Peter D.] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70809 USA; [Clift, Peter D.] Chinese Acad Sci, Key Lab Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Carter, Andrew] Univ London Birkbeck Coll, Dept Earth & Planetary Sci, London WC1E 7HX, England; [Nicholson, Uisdean] Shell Int Explorat & Prod, The Hague, Netherlands; [Masago, Hideki] Japan Agcy Marine Earth Sci & Technol, Ctr Deep Earth Explorat, Yokohama, Kanagawa, Japan.Zircon and apatite thermochronology of the Nankai Trough accretionary prism and trench, Japan: Sediment transport in an active and collisional margin setting,TECTONICS,2013,32(3):377-395
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