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	Structure of lithospheric density and geomagnetism beneath the Tianshan orogenic belt and their geodynamic implacations
	Zhao, JM; Li, ZC; Cheng, HG; Yao, CL; Li, YS
发表日期	2004
ISSN	0001-5733
起始页码	1061
结束页码	1067
卷号	47 期号:6 页码:52-63
英文摘要	The geoscience transect from Korla to Jimsar runs through the northern margin of the Tarim basin, the Tianshan orogenic belt and the southern margin of the Junggar basin. Along the profile a joint inversion of gravity with geomagnetism has been carried out and 2-D density structure and 2-D geomagnetic structure have been obtained. The result shows that the Tarim basin and the Junggar basin underthrust to the Tianshan orogenic belt in opposite directions. In the crust, the average density of the northern margin of the Tarim basin and the southern margin of the Junggar basin is relatively high, while that of the Tianshan orogenic belt is relatively low. However, the Tianshan orogenic belt bears a high geomagnetic intensity, especially in the entire crust from the southern margin of the Junggar basin to the middle of the Tianshan orogenic belt. This indicates that the southern margin and the northern margin of the Tianshan orogenic belt may possess different tectonic evolution histories, different tectonic movement patterns and different tectonic motion intensities. Some low density bodies located at the top part of the upper mantle are found on the boundaries between the Tarim basin and the Tianshan orogenic belt and that between the Junggar basin and the Tianshan orogenic belt. This may be inferred as a result of mass of the lower crust of the northern margin of the Tarim basin and the southern margin of the Junggar basin which has been carried down to the top part of the upper mantle beneath the Tianshan orogenic belt during the northward subduction of the Tarim block and that of the Junggar block southward. The 2-D density structure and the 2-D geomagnetic structure of the geoscience transect from Korla to Jimsar provide some lithospheric evidence for the tectonic segmentation of the Tianshan orogenic belt.
关键词	ASIA FAULTS SLIP
英文关键词	Junggar basin; Tianshan orogenic belt; Tarim basin; joint inversion of gravity with geomagnetism; lithosphere; dynamic analyses
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000225447300019
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/453
推荐引用方式 GB/T 7714	Zhao, JM,Li, ZC,Cheng, HG,et al. Structure of lithospheric density and geomagnetism beneath the Tianshan orogenic belt and their geodynamic implacations[J]. 中国科学院青藏高原研究所,2004,47(6):52-63.
APA	Zhao, JM,Li, ZC,Cheng, HG,Yao, CL,&Li, YS.(2004).Structure of lithospheric density and geomagnetism beneath the Tianshan orogenic belt and their geodynamic implacations.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,47(6),52-63.
MLA	Zhao, JM,et al."Structure of lithospheric density and geomagnetism beneath the Tianshan orogenic belt and their geodynamic implacations".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 47.6(2004):52-63.