Datailed characterization of mixed sedimentation: a case study of the Cambrian Mantou Formation in Xuzhou,Jiangsu Province
WEN Zuchao1,2, SHEN Yulin1,2, LI Zhuangfu1,2, JING Yuhong1,2, DANG Zhiying1,2, ZHU Yulin1,2, MENG Yan1,2, LI Linchao1,2
1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education,China University of Mining and Technology,Jiangsu Xuzhou 221008,China; 2 School of Resources and Geosciences,China University of Mining and Technology,Jiangsu Xuzhou 221116,China
Abstract：The Cambrian Mantou Formation in the Xuzhou area of Jiangsu Province is characterized by mixed siliciclastic-carbonate sedimentation. In this study,a set of typical mixed siliciclastic-carbonate sequences from the Mantou Formation were systematically analyzed for their petrological characteristics based on section and microscopic features. By analyzing the mixed sedimentation characteristics in various sedimentary environments,a mixed siliciclastic-carbonate sedimentation model was established in the epicontinental sea environment. The different types of mixing,mixing processes,and controlling factors of various mixed siliciclastic-carbonate rocks were investigated. Research has shown that there are mainly 11 types of mixed sedimentary combination types in the sequence,including sandy-bearing oolitic limestone,sandy limestone with intraclast,fine-grained limy sandstone,and limy-bearing siltstone. The overall sequence is a result of frequent fluctuations in secondary sea-level variation,accompanied by multiple periods of storm activity,within the context of epicontinental transgression. It mainly evolves from an inshore mixed carbonate-siliciclastic tidal flat to a mixed restricted platform. The sedimentation in the study area consists of facies mixing and punctuated mixing,with localized occurrences of in situ mixing and source mixing. Climate,terrestrial input,sea level changes,and carbonate yield rate serve as the primary factors influencing facies mixing,with additional influences from biological activities and hydrodynamic conditions. The multi-stage storm activity can dominate the formation of punctuated mixing,and promote the development of facies mixing and source mixing to some extent. Under the superimposed influence of various factors,the study area is characterized by the development of a combination of multiple mixing types. Clarifying the distribution of various mixing types and mixing process can provide reference for the restoration of the Cambrian paleoenvironment and sedimentary evolution of the North China Plate. It also offers typical examples for the study of mixed sedimentation in the‘deep time' epeiric platform.
WEN Zuchao,SHEN Yulin,LI Zhuangfu et al. Datailed characterization of mixed sedimentation: a case study of the Cambrian Mantou Formation in Xuzhou,Jiangsu Province[J]. JOPC, 2024, 26(4): 846-862.
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