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Sequence Paleogeographical Evolution of Epicontinental Deposit of Permo-Carboniferous in Southern North China

MA Shou-xian1,2 LI Zeng-xue2 LV Da-wei2(1.Institute of Geology and Geophysics,Chinese Academy of Scicence,Beijing 100029;2.College of Geosciences and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266510)  
Based on the study of sedimentary facies,biostratigraphy and stack patterns of parasequences,epicontinental depoisit of Permo-Carboniferous is divided into 3 sequences in Southern North China,which mean 3 trangressional circles.After that this article reconstructs paleogeography both in sequence and at maximum flood surface.It is found that source area lies in the north,and Sq1 develops a small-scale and short-term transgression,which is from NE.However,transgression in Sq2 reaches the top almost submerging the whole area,and changes its direction from NE to SE.Sq3 keeps the same land-sea distribution with Sq2,while trangressional area retreats to the south.Finally the genesis of paleogeographical evolution is discussed,and it is thought that epicontinental depoisit is dominated by global transgression,and transitional surface between Sq1 and Sq2 results from the synthesis of global sudden transgression,basin basement high in the south and low in the north,and stable source from the north in inactive tectonic setting.
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