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Title: New Insight Into the Crustal Structure of the Continental Margin offshore NW Sabah/Borneo Authors: Barckhausen, U.; Franke, D.; Behain, D.; Meyer, H. Affiliation: AA(BGR Federal Institute for Geosciences and Natural Resources, Stilleweg 2, Hannover, 30655 Germany ; u.barckhausen@bgr.de), AB(BGR Federal Institute for Geosciences and Natural Resources, Stilleweg 2, Hannover, 30655 Germany ; ), AC(BGR Federal Institute for Geosciences and Natural Resources, Stilleweg 2, Hannover, 30655 Germany ; ), AD(BGR Federal Institute for Geosciences and Natural Resources, Stilleweg 2, Hannover, 30655 Germany ; ) Publication: American Geophysical Union, Fall Meeting 2002, abstract #T62C-1317 Publication Date: 12/2002 Origin: AGU AGU Keywords: 3025 Marine seismics (0935), 3040 Plate tectonics (8150, 8155, 8157, 8158), 8015 Local crustal structure Abstract Copyright: (c) 2002: American Geophysical Union |
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木虫 (著名写手)
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2楼2010-01-04 15:08:08
3楼2010-01-11 13:08:49
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好像是会议摘要吧？不是全文 The continental margin offshore NW Sabah/Borneo (Malaysia) has been investigated with reflection and refraction seismics, magnetics, and gravity during the recent cruise BGR01-POPSCOMS. A total of 4000 km of geophysical profiles has been acquired, thereof 2900 km with reflection seismics. The focus of investigations was on the deep water areas. The margin looks like a typical accretionary margin and was presumably formed during the subduction of a proto South China Sea. Presently, no horizontal movements between the two plates are being observed. Like in major parts of the South China Sea, the area seaward of the Sabah Trough consists of extended continental lithosphere which is characterised by a pattern of rotated fault blocks and half grabens and a carbonate platform of Early Oligocene to Early Miocene age. We found evidence that the continental crust also underlies the Sabah Trough and the adjacent continental slope, a fact that raises many questions about the tectonic history and development of this margin. The tectonic pattern of the Dangerous Grounds' extended continental crust can be traced a long way landward of the Sabah Trough beneath the sedimentary succession of the upper plate. The magnetic anomalies which are dominated by the magnetic signatures of relatively young volcanic features also continue under the continental slope. The sedimentary rocks of the upper plate, in contrast, seem to generate hardly any magnetic anomalies. Based on the new data we propose the following scenario for the development of the NW Sabah continental margin: Seafloor spreading in the present South China Sea started at about 30 Ma in the Late Oligocene. The spreading process separated the Dangerous Grounds area from the SE Asian continent and ceased in late Early Miocene when the oceanic crust of the proto South China Sea was fully subducted in eastward direction along the Borneo-Palawan Trough. During Lower and/or Middle Miocene, Borneo rotated counterclockwise and was thrusted onto the edge of the rifted continental block of the Dangerous Grounds. The subducted oceanic crust of the proto South China Sea must today be located below the Eastern part of Sabah and not along the present NW Sabah Trough. |
4楼2010-01-11 16:22:03
sdxn
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5楼2010-01-11 16:28:31
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yanggis(金币+3,VIP+0):感谢分享 1-12 08:24
yanggis(金币+3,VIP+0):感谢分享 1-12 08:24
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http://www.sciencedirect.com/sci ... ce9866d99d89fdbb11e Elsevier的，自己去下 Seismic images of a collision zone offshore NW Sabah/Borneo |
6楼2010-01-11 20:42:10
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