Sequence stratigraphy and coal accumulation of the Upper Permian in Zhijin-Nayong Coalfield of western Guizhou Province
Guo Lijun1,2, Hong Yuanjin3, Shao Longyi2, Yi Tongsheng3, Zhang Weiping3, Wang Hao2
1 Tianjin Institute of Geological Survey，Tianjin300191 2 School of Geoscience and Survey Engineering，China University of Mining and Technology(Beijing)，Beijing100083 3 Guizhou Administration of Coal Geology，Guiyang553009，Guizhou
Abstract：The Zhijin-Nayong Coalfield in western Guizhou Province is well developed with marine-continental transitional facies and limestone markers，and thus became an ideal area for studying the Late Permian sedimentary facies and sequence stratigraphy in southwestern China.This paper has analyzed the high resolution sequence stratigraphy of the Late Permian coal seams(the Longtan and Changxing Formations).The coal-accumulating characteristics in the sequence stratigraphic framework have been discussed.Sequence boundaries represented by regional unconformity，incised valley filling sandstone base，and the palaeosol horizons have been identified.Combined with the transgression-regression cycles inferred by the distribution patterns of the limestone markers，the coal seams are subdivided into 3 third-order sequences.The total coal seams are is thicker in sequence Ⅲ and thinner in sequence Ⅱ，with the thinnest in sequence Ⅰ.Within the sequence，the thickest coals were developed in the transgressive systems tract and the thinnest coals were preserved in the lowstand systems tract.Based on reconstruction of the Late Permian sequence stratigraphic framework，we propose that the thick coal seams were developed in the delta plain environments of the transgressive systems tract.
Guo Lijun,Hong Yuanjin,Shao Longyi et al. Sequence stratigraphy and coal accumulation of the Upper Permian in Zhijin-Nayong Coalfield of western Guizhou Province[J]. JOPC, 2011, 13(5): 493-500.
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