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学科主题: Geochemistry & Geophysics
题名: Seismic reflection evidence for a Dangerous Grounds miniplate: No extrusion origin for the South China Sea
作者: Clift, P ; Lee, GH ; Duc, NA ; Barckhausen, U ; Van Long, H ; Zhen, S
通讯作者: p.clift@abdn.ac.uk
刊名: TECTONICS
发表日期: 2008
卷: 27, 期:3, 页:-
收录类别: sci
部门归属: [Clift, Peter; Van Long, Hoang] Univ Aberdeen, Dept Geol & Petr Geol, Sch Geosci, Univ London Kings Coll, Aberdeen AB24 3UE, Scotland; [Barckhausen, Udo] Fed Inst Geosci & Nat Resources, D-30655 Hannover, Germany; [Duc, Nguyan Anh] Vietnam Petr Inst, Hanoi, Vietnam; [Lee, Gwang H.] Pukyong Natl Univ, Dept Environm Explorat Engn, Pusan 608737, South Korea; [Clift, Peter; Zhen, Sun] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Clift, Peter] Univ Bermen, Bermen, Germany
项目归属: 海洋地质
摘要: The collision of India and Asia has caused large strike-slip faults to form in east Asia, resulting in the "extrusion'' of crustal blocks toward the southeast since the Eocene as a result of the indentation of rigid India into Asia. It has been suggested that the South China Sea opened as a result of relative motion between a rigid Indochina (Sundaland) block and China. Alternative models propose that rifting and seafloor spreading were driven by trench forces to the south. We test these competing models by analysis of seismic reflection profiles across the boundary between Sundaland and the southern rifted margin, known as the Dangerous Grounds. We show that the southern boundary of the Dangerous Grounds is a subduction zone that jammed in the middle Miocene. To the west the Dangerous Grounds are bounded by a strike-slip zone, also active until similar to 16 Ma, that becomes diffuse south of the now inactive South China Sea seafloor spreading center. We place the western edge of the Dangerous Grounds just to the east of the Natuna Arch (Lupar Line). The West Baram Line is confirmed as originating as a major strike-slip fault within the Dangerous Grounds and is continuous with the Red River Fault Zone. Because the Dangerous Grounds were independent of Sundaland until similar to 6 Ma, its motion cannot have been constrained by motion of this block, making extrusion impossible as a mechanism to rift the South China Sea. SE motion by both the Dangerous Grounds and Sundaland suggests subduction forces were the primary trigger for plate motions. Our reconstruction places a similar to 280 km upper limit on the motion on the Red River Fault and a similar to 1400 km width to the paleo-South China Sea.
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WOS记录号: WOS:000256570100001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4544
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, P; Lee, GH; Duc, NA; Barckhausen, U; Van Long, H; Zhen, S.Seismic reflection evidence for a Dangerous Grounds miniplate: No extrusion origin for the South China Sea,TECTONICS,2008,27(3):-
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