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Thermal-rheological structure of lithosphere beneath the northern flank of Tarim Basin, western china: Implications for geodynamics

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Science china earth Sciences 2004年第7期47卷 659-672页

作者： liu shaowen1, wang liangshu1,{2., li hua1, han yongbing1, jia chengzao2.& wei guoqi2.1.department of earth Sciences, nanjing university,nanjing 2.0093,{12. 2.Chinese Petroleum Exploration and Development Institution,Beijing 100083,china 1. department of earth Sciences Nanjing University 210093 Nanjing China 2. Chinese Petroleum Exploration Development Institution 100083 Beijing China

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 2. and 2. 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 2. 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

关键词： thermal-rheological structure of lithosphere, rheological stratification, geodynamics, Tarim Basin.

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