Geothermal Evidence of the Mesozoic and Cenozoic Lithospheric Thinning in the Liaohe Depression  

作　　者：左银辉 邱楠生 庞雄奇 常健 郝情情 高霞 

机构地区：[1]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum [2]Research Center for Basin and Reservoir, China University of Petroleum [3]Research Institute of Exploration and Development, Zhongyuan Oilfield, SINOPEC [4]Institute of Mineral Resource Research, China Metallurgical Geology Bureau

出　　处：《Journal of Earth Science》2013年第4期529-540,共12页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 91114202, 90914006);the State Key Laboratory of Petroleum Resource and Prospecting (No.PRPJC2008-01);the National Science Foundation Projectof CQ (No. CSTC2012jjb9007)

摘　　要：The Liaohe （辽河） depression is an important part of the Bohai （渤海） Bay Basin, and the Bohai Bay Basin located in the center of Hthospheric destruction and thinning in the eastern North China Craton. The North China Hthospheric thinning activities have been verified from evidences of structural geology, petrology, geochemistry and geophysics, but there are still some controversies on their timing, mechanism and controlling factors. The sedimentary basin is a thin-bedded geologic unit with a limited distribution in the upper lithosphere, and its formation and evolution represent the shal- low response of the deep geodynamic process. Therefore, its thermal evolution is closely related to the deep dynamic conditions. In this article, the Mesozoic-Cenozoic thermal history of the Liaohe depres- sion is reconstructed using the vitrinite reflectance and apatite fission track data. Meanwhile ＂thermal＂ ilthospheric thicknesses in the Mesozoic and Cenozoic are calculated using the geothermic method on the basis of the above thermal history results. The results show that the Liaohe depression has undergone the Cretaceous and Paleogene heat flow peaks, 81 and 83 mW/m2, respectively, corres- ponding to two strong rift movements. Accor- dingly, the depression has experienced two dif- ferent levels of thinning processes in the Creta- ceous and the Paleogene since the Mesozoic, and the ＂thermal＂ lithospheric thicknesses were 60 and 50 Ion, respectively. This may reveal that the depression has experienced two large-scale de- structions. The work may provide valuable geo- thermal evidence for initial revealing the time, process and stage of the lithospheric thinning in the Liaohe depression.The Liaohe （辽河） depression is an important part of the Bohai （渤海） Bay Basin, and the Bohai Bay Basin located in the center of Hthospheric destruction and thinning in the eastern North China Craton. The North China Hthospheric thinning activities have been verified from evidences of structural geology, petrology, geochemistry and geophysics, but there are still some controversies on their timing, mechanism and controlling factors. The sedimentary basin is a thin-bedded geologic unit with a limited distribution in the upper lithosphere, and its formation and evolution represent the shal- low response of the deep geodynamic process. Therefore, its thermal evolution is closely related to the deep dynamic conditions. In this article, the Mesozoic-Cenozoic thermal history of the Liaohe depres- sion is reconstructed using the vitrinite reflectance and apatite fission track data. Meanwhile ＂thermal＂ ilthospheric thicknesses in the Mesozoic and Cenozoic are calculated using the geothermic method on the basis of the above thermal history results. The results show that the Liaohe depression has undergone the Cretaceous and Paleogene heat flow peaks, 81 and 83 mW/m2, respectively, corres- ponding to two strong rift movements. Accor- dingly, the depression has experienced two dif- ferent levels of thinning processes in the Creta- ceous and the Paleogene since the Mesozoic, and the ＂thermal＂ lithospheric thicknesses were 60 and 50 Ion, respectively. This may reveal that the depression has experienced two large-scale de- structions. The work may provide valuable geo- thermal evidence for initial revealing the time, process and stage of the lithospheric thinning in the Liaohe depression.

关 键 词：North China Craton Liaohe depression thermal history lithospheric thinning. 

分 类 号：P618.13[天文地球—矿床学]