Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province
LI Fengjie1,2, WANG Jia3, MA Xiaokang2, LAI Xuelian2, ZHANG Pengfei2, REN Xuying2, CHEN Zheng'an2
1 State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan Chengdu 610059, China; 2 Institute of Sedimentary Geology, Chengdu University of Technology & Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications, MNR,Sichuan Chengdu 610059, China; 3 College of Earth Science, Chengdu University of Technology, Sichuan Chengdu 610059, China
Abstract：The Devonian of Longmen Mountain area is an important and highly studied area. The Middle Devonian Jinbaoshi Formation is composed of clastic rocks,carbonate rocks and mixed rocks. In this paper,the sedimentary facies of the Jinbaoshi Formation were studied in detail based on thin section observation and the measured data of the Pingyipu section in Pingwu County and Ganxi section in Beichuan County. The results show that the Middle Devonian Jinbaoshi Formation in Longmen Mountain area has four sedimentary facies,namely fluvial,clastic shore,shelf and carbonate ramp. The sedimentary evolution experienced two cycles. The mixed sedimentation of Jinbaoshi Formation was produced by facies mixing and in situ mixing. The change of relative sea level,terrigenous clastic supply,carbonate production rate and paleoclimate are the main controlling factors for the mixed deposition of facies mixing,while wave and storm waves are the main mechanisms for the mixed deposition of terrigenous clastic and carbonate components. The study on the sedimentary sequence,sedimentary characteristics and sedimentary evolution of the Jinbaoshi Formation is helpful to improve the understanding of the sedimentary paleoenvironment of the Devonian in Longmen Mountain area,Sichuan Basin.
LI Fengjie,WANG Jia,MA Xiaokang et al. Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province[J]. JOPC, 2023, 25(2): 294-307.
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