Discovery and Significance of Wuchiapingian Conodonts from Leye of Guangxi
Wuchiapingian is a key interval as a fast ecosystem recovery period between two mass extinctions,the End-Guadalupian crisis and the End-Permian mass extinction.Carbonate platforms were widely distributed in the middle of Yangtze platform and the Dian-Qian-Gui area during this interval.Among them,the Leye carbonate platform is one of the typically isolated carbonate platforms within the Nanpanjiang basin.The continuous Wuchiapingian marine carbonate(Heshan Formation)was deposited above the disconformity surface on the top of Guadalupian Maokou Formation.The traditional Middle-Late Permian stratigraphic frame scale in this area mainly relies on the fusulinids biozones,while only a few Wuchiapingian conodonts have been reported.Here,conodonts from the base of Heshan Formation at the Shuabacun Section and the Liuwei Section in the Leye platform have been obtained and studied.Eight conodont species(including one new species)belonging to two genera in total were identified,and they are Clarkina asymmetrica,C.aff.asymmetrica,C.daxianensis,C.dukouensis,C.leveni,Hindeodus julfensis,H.typicalis and Hindeodus praechangxingensis sp.nov..In ascending order,two conodont zones,the C.asymmetrica Zone and the C.leveni Zone can be identified at the Shuabacun Section.And one conodont zone,the C.asymmetrica Zone is also identified at the Liuwei Section.Based on this,we surmise that the beginning of the early Wuchiapingian carbonate deposition occurs in the C.asymmetrica Zone at Leye carbonate platform,after the global end-Guadalupian regression.It can provide important data for studying the local carbonate platform and basin evolution and also regional stratigraphic correlation.
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