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EVOLUTION OF TRANSFORM-EXTENSION YINGGEHAI BASIN

Sun Jiazhen;Li Lanbin(Department of Petroleum Geology, China University of Geosciences,Wuhan 430074)Yang Shigong(Department of Mineral Resources,China University of Geosciences,Wuhan 430074)Zhang Qiming(Nanhai West oil Corp,Zhanjing 524057)  
Based on the systematic researches of histories of the subsidence,deformation,infilling and bury, the paper has determined the type and evolution stages of Yinggehai basin, and established the model of transform-extension basin, Evolution of Yinggehai basin can be divided into four major stages:(1)initial fault depression;(2)rifting;(3)depression; and(4) rerifting stages.The subsidence mechanism includes:simple extension of initial fault-depression in the lithospheric rigidity body; strike-extension of rifting related to the influence of reactivated pre-existing basement shear zones;slightly strike-extension,surperimposed thermal subsidence of depression;strike-extension, superimposed gravity,subsidence and compaction of rerifting.
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