Sedimentary environment and evolution of the Upper Permian Linxi Formation in Linxi area, Inner Mongolia
Zhai Daxing1,2, Zhang Yongsheng1, Tian Shugang3, Wu Feimeng1,4, Xing Enyuan1 Wang Meng1,3, Shi Lizhi1,5, Wang Zhuozhuo1,5
1 MLR Key Laboratory of Saline Lake Resources and Environments,Institute of Mineral Resources, Chinese Academy of Geological Sciences,Beijing 100037 2 School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083 3 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037 4 School of Geosciences,Yangtze University,Wuhan 430100,Hubei 5 Exploration and Development Research Institute,PetroChina Daqing Oilfield Company Limited,Daqing 163712,Heilongjiang
Abstract：Sedimentary environment of the Upper Permian Linxi Formation in eastern Inner Mongolia has been in dispute for a long time. Herein, based on previous research data, the environment is discussed in this paper after detailed field and indoor study on palaeontology,sedimentary structure,lithofacies,geochemistry etc. Evidences from marine fossils(calcareous algae,bryozoans,and sponges),B/Ga value,carbon and oxygen isotopes,sedimentary structure,and other aspects show that the Linxi Formation is mainly of marine facies along with partial transitional facies. It is principally divided into delta front,littoral,shallow sea and semi￣deep sea. Reefs mainly include blue green algae bonding reefs and algal bonding framework reefs,suggesting a littoral and shallow sea environment. The depositional environment of Linxi Formation developed from littoral,semi￣deep sea,delta front,shallow sea to littoral,while the evolution of sedimentary basin was divided into five stages, including uplift,rift,rapid,filling, steady subsidence and stable filling stages.
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