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Lithospheric thermal-theological structures of the continental margin in the northern South China Sea
Shi, XB; Zhou, D; Zhang, YX; Shi, XB, Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China
2000
发表期刊CHINESE SCIENCE BULLETIN
ISSN1001-6538
卷号45期号:22页码:2107-2112
摘要Thermal structures of three deep seismic profiles in the continental margin in the northern South China Sea are calculated, their "thermal" lithospheric thicknesses are evaluated based on the basalt dry solidus, and their rheological structures are evaluated with linear frictional failure criterion and power-law creep equation. "Thermal" lithosphere is about 90 km in thickness in shelf area, and thins toward the slope, lowers to 60-65 km in the lower slope, ocean crust and Xisha Trough. In the mid-west of the studied area, the lithospheric rheological structure in shelf area and Xisha Islands is of four layers: brittle, ductile, brittle and ductile. Because of uprising of heat mantle and thinning of crust and lithosphere in Xisha Trough, the bottom of the upper brittle layer is only buried at 16 km. In the eastern area, the bottom of the upper brittle layer in the north is buried at 20 km or so, while in lower slope and ocean crust, the rheological structure is of two layers of brittle and ductile, and crust and uppermost mantle form one whole brittle layer whose bottom is buried at 30-32 km. Analyses show that the characteristics of rheological structure accord with the seismic result observed. The character of rheological stratification implies that before the extension of the continent margin, there likely was a ductile layer in mid-lower crust. The influence of the existence of ductile layer to the evolution of the continent margin and the different extensions of ductile layer and brittle layer should not be overlooked. Its thickness, depth and extent in influencing continent margin's extension and evolution should be well evaluated in building a dynamic model for the area.
部门归属Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China
关键词Northern South China Sea "thermal" Lithospheric Thickness Lithospheric Rheological Structure
学科领域Multidisciplinary Sciences
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000165798500018
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4666
专题中科院边缘海地质重点实验室
通讯作者Shi, XB, Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China
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Shi, XB,Zhou, D,Zhang, YX,et al. Lithospheric thermal-theological structures of the continental margin in the northern South China Sea[J]. CHINESE SCIENCE BULLETIN,2000,45(22):2107-2112.
APA Shi, XB,Zhou, D,Zhang, YX,&Shi, XB, Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China.(2000).Lithospheric thermal-theological structures of the continental margin in the northern South China Sea.CHINESE SCIENCE BULLETIN,45(22),2107-2112.
MLA Shi, XB,et al."Lithospheric thermal-theological structures of the continental margin in the northern South China Sea".CHINESE SCIENCE BULLETIN 45.22(2000):2107-2112.
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