Abstract To better understand the deposition and sea level change histories of the Ladinian carbonate platform margin in the South China,this paper studied the sedimentary characteristics of the Middle Triassic Longtou Formation at the Pazichang section,Guizhou Province. The Longtou Formation is divided into 3 members based on lithofacies and their associations. The Lower Member of Longtou Formation consists mainly of oncoidal limestones and stromatolites,which are indicative of intertidal to supratidal environments. The Middle Member is composed of oncoidal rudstones,mudstones,laminated limestones,and pisoidal rudstones in the lower part,and oncoidal rudstones and stromatolites in the upper part. Subaerial exposure occurs at the uppermost position of the lower part of Middle Member,where the thickest laminated limestones are deposited. In contrast,the upper Middle Member was probably formed in intertidal to supratidal environment. The Upper Member consists of oncoidal rudstones and peloidal packstones,indicating an intertidal-subtidal environment. The reconstructed sea level change curve suggests a general sea level rise occurring during the Ladinian period in Guizhou. During the deposition of the Middle Member of Longtou Formation,however,sea level underwent a rapid fall, which possibly corresponds to the Ladinian Great Sea-level Regression event. Thereafter,sea level rises gradually and the deposition in tidal environment continues. Hence,the sea level change history during the deposition of the upper Middle Member to the Upper Member is consistent with the global sea level change and that in the southwestern Guizhou. The results provide clues to better understanding the origin of the laminated limestones and the latest Middle Triassic biotic recovery.
Fund:Co-funded by the Young Scientists Foundation of National Natural Science Foundation of China(No.41502103)and the State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences (No.GKZ17Y643)
Corresponding Authors:
Li Rong,born in 1984,is an associate professor in the State Key Laboratory of Biogeology and Environmental Geology at the China University of Geosciences. She is working on diagenesis of the Permian-Triassic and Cenozoic carbonate successions. E-mail: rongli_cug@163.com.
Cite this article:
Tan Rui-Chang,Li Rong,Wang Yao. Sedimentary characteristics of the Middle Triassic Longtou Formation in Guizhou Province,South China: Implications for sea-level change[J]. JOPC, 2018, 20(3): 389-408.
Tan Rui-Chang,Li Rong,Wang Yao. Sedimentary characteristics of the Middle Triassic Longtou Formation in Guizhou Province,South China: Implications for sea-level change[J]. JOPC, 2018, 20(3): 389-408.
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