Cenozoic tectono-sedimentary characteristics and extension model of the Northwest Sub-basin, South China Sea
Cenozoic tectono-sedimentary characteristics and extension model of the Northwest Sub-basin, South China Sea
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南海西北次盆地新生代构造沉积特征及伸展模式
DOI：
10.1016/j.gsf.2011.05.010
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发表时间：
2011-10
影响因子：
8.9
通讯作者：
Ding, W.W.
中科院分区：
文献类型：
--
作者：
Li, M.B.;Ruan, A.G.;Zhao, L.H.;Ding, W.W.
通过对南海西北次盆地3条地震剖面和1条广角地震剖面的解释，研究了该次盆地的地层层序、变形特征和伸展模式。确定了三个构造地层单位。对拉张作用的详细分析表明，拉张作用主要发生在古近纪，拉张作用的结果是形成了以拉张中心为中心对称分布的半地堑或地堑。沉积物的特征是反射体杂乱不连续，指示碎屑沉积。再往西南方向，次盆地的特征主要是大陆裂谷作用，而不是海底扩张作用。裂谷作用受裂谷的形态控制，沿中沙-西沙地块的北方边缘沿着发展，而不是与西沙海槽汇合。25Ma后，一个向南的脊跳触发了西南次盆地的开放。西北次海盆的海底扩张所产生的北西向应力可能阻止了次海盆的继续张开。之后，西北次盆地经历了热冷却，并表现出广泛的沉降。广角地震剖面的速度模型所反映的地壳深部结构也是围绕扩张中心对称的，这表明西北次盆地可能是以纯剪切模式张开的。
Based on the interpretations of three seismic profiles and one wide-angle seismic profile across the Northwest Sub-basin, South China Sea, stratigraphic sequences, deformation characteristics and an extension model for this sub-basin have been worked out. Three tectonic-stratigraphic units are determined. Detailed analyses of extension show that the event occurred mainly during the Paleogene and resulted in the formation of half-grabens or grabens distributed symmetrically around the spreading center. Sediments are characterized by chaotic and discontinuous reflectors, indicating clastic sediments. Farther to the southwest, the sub-basin features mainly continental rifting instead of sea-floor spreading. The rifting would have been controlled by the shape of the massif and developed just along the northern edge of the Zhongsha-Xisha Block, rather than joined the Xisha Trough. After 25 Ma, a southward ridge jump triggered the opening of the Southwest Sub-basin. The NW-directed stress caused by the sea-floor spreading of the Northwest Sub-basin may have prevented the continuous opening of the sub-basin. After that the Northwest Sub-basin experienced thermal cooling and exhibited broad subsidence. The deep crustal structure shown by the velocity model from a wide-angle seismic profile is also symmetrical around the spreading center, which indicates that the Northwest Sub-basin might have opened in a pure shear model.
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影响因子：
--
作者：
D. Hayes;S. Nissen;P. Buhl;J. Diebold;Yao Bochu;W. Zeng;Yong-shun Chen
通讯作者：
D. Hayes;S. Nissen;P. Buhl;J. Diebold;Yao Bochu;W. Zeng;Yong-shun Chen
影响因子：
--
作者：
X. Pang;Changmin Chen;Dajun Peng;M. Zhu;Y. Shu;H. Min;Jun Shen;Bao-jin Liu
通讯作者：
X. Pang;Changmin Chen;Dajun Peng;M. Zhu;Y. Shu;H. Min;Jun Shen;Bao-jin Liu
影响因子：
3
作者：
Zhen Sun;Zhihong Zhong;M. Keep;Di Zhou;Dongsheng Cai;Xusheng Li;Shimin Wu;Jianqun Jiang
通讯作者：
Zhen Sun;Zhihong Zhong;M. Keep;Di Zhou;Dongsheng Cai;Xusheng Li;Shimin Wu;Jianqun Jiang
南海最东北部大陆边缘和洋盆的结构：地球物理约束和构造意义
DOI：
10.1007/s11001-007-9014-9
发表时间：
2007-03
期刊：
Marine Geophysical Researches
影响因子：
--
作者：
通讯作者：
--
DOI：
--
发表时间：
2002
期刊：
Geological Journal of China Universitiesf
影响因子：
--
作者：
Chu Feng-you
通讯作者：
Chu Feng-you