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《Oil & Gas Geology》 1985-02
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THE FORMATION OF THRUST STRUCTURES AND HYDROCARBON EVOLUTION IN SOUTH CHINA IN VIEW OF CONTINENTAL CRUST EXPANSION

Zhang Yongxia (Comprehensive Aerogeophysical Brigade,Ministry of Geology and Mineral Resources)  
Five first-order ring structures,such as Hunan-Jiangxi,Guangdong,Fujian-Zhejiang,Jiangsu-Zhejiang,Sichuan-Hunan,have been revealed in south China.They might be considered as manifestations of both fossil hot spots and crustalmicro-expansion centres appeared due to the effects of mantle convection orheat plumes on lithosphere in the Mesozoic.The mantle convection can cause not only a sea floor spreading,but alsoextention and splitting of the continental lithosphere.The arcuate structures,such as the southeast Sichuan,Bamianshan,Guangxi and Dabashan arcuate struc-tures found in the southwestern China,might be formed through horizontal compression exerted by the intracontinental micro-expansion centres during theLate Mesozoic time.In the southeastern area of Sichuan Province,the intersec-tion of different strike of folds are clearly resulted from the stress transmittedfrom different micro-expansion centres.The nappes located both in Mt.Xuefengof Hunan Province and in the southern part of Jiangsu Province are alsoconsidered to be related with adjacent intracontinental expansions.The mantle hot spots indicated the above mentioned five first-order ring structures have seemingly migrated all the time southeastward from the hinter-land towards the sea area ever since the Mesozoic.Along the trajectories oftheir migration,it seems that the supracrustal sediments might have been subjectedto high temperature ranging from 200℃ to 700℃.This would be harmful to the pre-servation of hydrocarbon in Palaeozoic systems.The heat value of the westernpart of Mr.Xuefeng is in general lower than 200℃,and this is better for thepreservation of hydrocarbon in the area,whereas in the eastern part,the con-ditions are different.
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