Sequence stratigraphy and lithofacies palaeogeography of the Late Triassic coal measures in South China
Shao Longyi1, Li Yingjiao1,2, Jin Fengxian1, Gao Caixia1,2,Zhang Chao1, Liang Wanlin3, Li Guangming4, Chen Zhongshu3, Peng Zhengqi4, Cheng Aiguo5
1 College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing),Beijing.100083 2 Chongqing Institute of Geology and Mineral Resources,Chongqing.400042 3 Sichuan Coalfield Geology Bureau,Chengdu.610045,Sichuan 4 Hunan Administration of Coal Geological Exploration,Changsha.411114,Hunan 5 China National Administration of Coal Geology,Beijing.100039
Abstract：The depositional characteristics and environments,and the sequence stratigraphy of the Late Triassic coal measures in South China were studied based on data from outcrops and borehole sections. The third-order sequence-based lithofacies palaeogeography of the coal measures was reconstructed,and the coal accumulation pattern of the Late Triassic in the South China was summerized. Two major facies types,i.e., continental and transitional,were identified within the coal measures based on characteristics of lithofacies and lithofacies associations. The continental facies types include alluvial fan,braided fluvial and meandering fluvial facies,and the transitional facies types include deltaic,lacustrine(mainly shallow lake),tidal-lagoon,coastal plain and neritic facies. The continental facies were mainly distributed in the Upper Yangtze Block,typically in the Sichuan Basin,whereas the transitional facies mainly distributed in the eastern South China,typically in the Hunan-Jiangxi-Guangdong littoral and shallow marine area. Sequence boundaries,including regional unconformities and tectonic stress switching surfaces,fluvial incision surfaces,and abrupt change surfaces of lithology were identified. According to these sequence boundaries,the Late Triassic coal measures were subdivided into five third-order sequences. The lithofacies palaeogeography map of each third-order sequence was reconstructed based on the distribution of facies. The favorable coal accumulating palaeogeographic units were recognized based on the coal thickness and lithofacies palaeogeography maps,and the most favorable coal accumulating palaeogeographic unit was the delta plain unit,followed by fluvial unit,and tidal flat-lagoon unit. It was predicted that the coal-accumulating centers were located in the Leshan-Weiyuan Coalfield and the Huayingshan Coalfield in the Sichuan Basin,and the southeastern Hunan and western Central Jiangxi in the Hunan-Jiangxi-Guangdong littoral and shallow marine area.
Shao Longyi,Li Yingjiao,Jin Fengxian et al. Sequence stratigraphy and lithofacies palaeogeography of the Late Triassic coal measures in South China[J]. JOPC, 2014, 16(5): 613-630.
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