Sequence-palaeogeography and coal accumulation of the Late Permian in South China
Shao Longyi1, Zhang Chao1, Yan Zhiming1, Dong Daxiao1, Gao Caixia1, Li Yingjiao1, Xu Xiaoyan1, Liang Wanlin2, Yi Tongsheng3, Xu Xihui2, Li Guangming4, Chen Zhongshu2, Cheng Aiguo5
1 College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083; 2 Sichuan Administration of Coal Geology,Chengdu 610045,Sichuan; 3 Guizhou Administration of Coal Geology,Guiyang 550081,Guizhou; 4 Hunan Administration of Coal Geology,Changsha 410014,Hunan; 5 China National Administration of Coal Geology,Beijing 100039
Abstract：The Late Permian is a significant period for coal accumulation,and during this period minable coal seams were formed in the most parts in South China. Impacted by sea level changes,a full range of facies were developed in the coal-bearing successions,including terrestrial,terrestrial-marine transitional,and marine facies. By means of data from outcrop section and borehole cores,some key sequence stratigraphic surfaces were recognized which including regional unconformities,basal surface of incised valley fills,inter-fluvial paleosol horizons,and facies-reversal surfaces. The maximum flooding surfaces were also recognized by the reginal distribution of marine limestone beds towards palaeo-continent. Combined with the achievements made by previous research on stratigraphic sub-correlation and regional coal correlation in South China,the Upper Permian are subdivided into three third-order sequences and nine systems tracts. The single factor analysis and multifactor comprehensive mapping method was used to reconstruct the lithofacies palaeogeography of each third sequence. The results showed that the coals in sequence I were formed in tide-influenced lower delta plain and lagoon-tidal flat facies belts,with distribution of the thick coal seams being controlled by these facies belts. In sequence Ⅱ,thick coals were developed in delta plain facies belts and the thin coals were formed in the open platform facies belts. The total thickness of coal seams in sequence Ⅱ decreased stepwise from west to east in South China,displaying that the coal in the western part were thickest,the coals in the central part were thin,while no coal were formed in the eastern part. The coals in sequence Ⅲ were formed mainly in delta plain facies belt which was mainly developed in the western part of South China,mainly in the eastern part of the Kangdian Oldland. During this period,the central and eastern parts of South China were occupied by the shallow marine carbonate platform and deep marine facies belts which were not favorable for coal accumulation.
Shao Longyi,Zhang Chao,Yan Zhiming et al. Sequence-palaeogeography and coal accumulation of the Late Permian in South China[J]. JOPC, 2016, 18(6): 905-919.
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