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《Chinese Journal of Geophysics》 2004-06
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STRUCTURE OF LITHOSPHERIC DENSITY AND GEOMAGNETISM BENEATH THE TIANSHAN OROGENIC BELT AND THEIR GEODYNAMIC IMPLACATIONS

ZHAO Jun-Meng 1,2 LI Zhi-Chun 3 CHENG Hong-Gang 1 YAO Chang-Li 4 LI Yi-Shi 5 1 Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 2 Institute of Geology, China Earthquake Administration, Beijing 100029, China 3 Institute of Occupational Disease Protection for Laboring Hygiene of Hunan Province, Changsha 410007, China 4 China University of Geosciences, Beijing 100083, China 5 China Earthquake Administration, Beijing 100036, China  
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.
【Fund】: 国家 973项目 (G19990 43 3 0 1)资助
【CateGory Index】: P542
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