Thermal Lithospheric Thickness of the Sichuan Basin and its Geological Implications  

作　　者：ZHU Chuanqing QIU Nansheng CHEN Tiange XU Ming DING Rui YANG Yabo 

机构地区：[1]College of Geosciences,China University of Petroleum,Beijing 102249,China [2]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China [3]Research Institute of Petroleum Exploration Development,Beijing 100083,China [4]Tianjin Geothermal Exploration and Development-design Institute,Tianjin 300250,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第4期1323-1330,共8页地质学报（英文版）

基　　金：supported by the National Key Research&Development Program of China(Grant No.2017YFC0603102);the National Natural Science Foundation of China(Grant No.41772248 and 41830424)。

摘　　要：Thermal lithospheric thickness is an important parameter in studying the tectonic-thermal evolution of basins and plate dynamics.Based on the measured geothermal data and thermophysical properties of the rocks,the thermal lithospheric thickness of the Sichuan Basin was calculated according to the principles of heat conduction in the crust and lithospheric mantle.The calculation results revealed that the thickness of the thermal lithosphere in the Sichuan Basin is 140-190 km and is unevenly distributed.The thickness of the thermal lithosphere in central Sichuan and southwestern Sichuan is less than 160 km,while that in the western Sichuan depression and eastern Sichuan is larger(~180 km).The distribution of the thermal lithospheric thickness in the basin has a good correlation with the geological units and the thickness of the sedimentary layers.The thickness of the thermal lithosphere in the depression area,which has thick sedimentary layers and the fault-fold zone with shallow crustal deformation and thickening,are larger than that in the basement uplifted area,which has thin sedimentary layers.The calculated thermal lithospheric thickness is in good agreement with the geophysical data and reflects the stable conduction temperature field in the Sichuan Basin.The present thermal regime and thermal lithospheric thickness of the Sichuan Basin indicate that flexural thickening of the lithosphere occurred in the eastern Sichuan fault-fold belt and the Longmen Mountain-Western Sichuan depression foreland basin system,while asthenospheric uplift occurred in the central Sichuan region,which were the result of the expansion of the Xuefeng orogeny from the east and the compression of the Tibetan Plateau from the west.

关 键 词：thermal lithospheric thickness geothermal field heat flow thermal property Sichuan Basin 

分 类 号：P314[天文地球—固体地球物理学]