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学科主题: Multidisciplinary Sciences
题名: Lithospheric thermal-theological structures of the continental margin in the northern South China Sea
作者: Shi, XB ; Zhou, D ; Zhang, YX
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
关键词: northern South China Sea ; "thermal" lithospheric thickness ; lithospheric rheological structure
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2000
卷: 45, 期:22, 页:2107-2112
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
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.
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WOS记录号: WOS:000165798500018
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4666
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Shi, XB; Zhou, D; Zhang, YX.Lithospheric thermal-theological structures of the continental margin in the northern South China Sea,CHINESE SCIENCE BULLETIN,2000,45(22):2107-2112
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