Thermal-rheological structure of lithosphere beneath the northern flank of Tarim Basin, western China: Implications for geodynamics
Thermal-rheological structure of lithosphere beneath the northern flank of Tarim Basin, western China: Implications for geodynamics作者机构：1. Department of Earth Sciences Nanjing University 210093 Nanjing China 2. Chinese Petroleum Exploration Development Institution 100083 Beijing China
出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)
年 卷 期：2004年第47卷第7期
页 面：659-672页
核心收录：
学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程]
基 金：This work was jointly supported by the National Natural Science Foundation of China (Grant No. 49832040) the State Key Program for Basic Sciences of China (Grant No. 1999043302) the National 9th Five-Year Plan Special Research Programs of China (Grant No. 99-111)
主 题：thermal-rheological structure of lithosphere, rheological stratification, geodynamics, Tarim Basin.
摘 要：Based on the data of geo-temperature and thermophysical parameters of rocks in the Kuqa Depression and the Tabei Uplift, northern flank of the Tarim Basin, in terms of the analytical solution of 1-D heat transfer equation, the thermal structure of the lithosphere under this region is determined. Our results show that the average surface heat flow of the northern flank of the Tarim Basin is 45 mW/m2, and the mantle heat flow is between 20 and 23 mW/m2; the temperature at crust-mantle boundary (Moho) ranges from 514°C to 603°C and the thermal lithosphere where the heat conduction dominates is 138–182 km thick. Furthermore, in combination with the P wave velocity structure resulting from the deep seismic sounding profile across this region and rheological modeling, we have studied the local composition of the lithosphere and its rheological profile, as well as the strength distribution. We find that the rheological stratification of the lithosphere in this region is apparent. The lowermost of the lower crust is ductile; however, the uppermost of the mantle and the upper and middle parts of the crust are both brittle layers, which is typically the so-called sandwich-like structure. Lithospheric strength is also characterized by the lateral variation, and the uplift region is stronger than the depression region. The lithospheric strength of the northern flank of the Tarim Basin decreases gradually from south to north; the Kuqa Depression has the lowest strength and the south of the Tabei Uplift is strongest. The total lithospheric strength of this region is4.77×1012–5.03×1013 N/m under extension, and 6.5×1012–9.4×1013 N/m under compression. The lithospheric brittleductile transition depth is between 20 km and 33 km. In conclusion, the lithosphere of the northern flank of the Tarim Basin is relatively cold with higher strength, so it behaves rigidly and deforms as a whole, which is also supported by the seismic activity in this region. This rigidity of the Tarim lithosphe
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