Discovery and significance of gravity flow deposits of the late Maokouan in Shaoyang area of Hunan Province
Shao Longyi1, Liu Bingqiang1, Ji Congwei1, Wu Yide2, Li Zhineng2, Peng Zhengqi2, Zhang Chao1, Li Guangming2
1 College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083; 2 Hunan Bureau of Coal Geology,Changsha 410014, Hunan;
Abstract：The gravity flow deposits with typical geological characteristics and depositional sequence are developed in the Lower Longtan Formation(late Maokouan in Middle Permian),which are well exposed in a road cut cliff along the Shaoyang aveneue in the suburb of Shaoyang City,central Hunan Province. The gravity flow deposits are mainly composed of massive sandstones, interbedded siltstones and mudstones. Sedimentary structures including load cast,flute cast,tool mark and scouring-filling structures are developed at the bottom of the sandstones,whereas massive bedding,parallel bedding,convolute bedding and graded bedding are developed in the internal part of sandstones. Trace fossils similar to Paleodictyon are found in interbedded mudstones. The deposits of sandy debris flow and turbidity current,and slumps are recognized based on the sedimentary structures seen in the outcrops. The lower part of the section is developed with muddy-gravel-bearing massive sandstone and the upper part was dominated by interbedded sandstones with thin to middle-thick beds,slitstones and mudstones. The gravity flow sedimentary model is established based on the characteristics of gravity flow deposits and their vertical sequences,and the inner fan,middle fan and outer fan facies belts are subdivided. Based on the comparison with sedimentary characteristics of the lower part of the Longtan Formation in the adjacent Duanpiqiao exploration area,and referred to the overall Middle Permian palaeogeography of southern China,we believe that the gravity flow deposits developed in the Late Middle Permian(lower Longtan Formation)in the Shaoyang area imply the deep fault between the Cathaysia landmass and the Yangtze landmass had stretched and formed a extensional trough basin during the late Maokouan.
Shao Longyi,Liu Bingqiang,Ji Congwei et al. Discovery and significance of gravity flow deposits of the late Maokouan in Shaoyang area of Hunan Province[J]. JOPC, 2017, 19(4): 583-594.
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