Discovery of the Norian conodont Mockina slovakensis in Hongyan section of Baoshan area,Yunnan Province and its indication to sedimentary environment
GUO Bao1, DU Yixing1,2, SHI Zhiqiang1,2, JIN Xin1,2
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China
Abstract：Mockina slovakensis is one of the important species of conodont in Norian period. It plays a significant role in stratigraphy and acts as an indication for certain distinctive sedimentary environments. In this study,a significant abundance of conodont species M. slovakensis was discovered in the limestone deposits located in the lower parts of the Dashuitang Formation in the Hongyan section of Baoshan,Yunnan. Based on the conodont biostratigraphy,the age of the sedimentary strata in this section has been constrained to the late Alaunian of Norian period. Its presence and abundance can provide valuable insights into the paleoenvironmental conditions and depositional settings. M. slovakensis is known for strong adaptability to a diverse living environments,including both shallow and deep oceanic environment,as well as restricted sea to open sea. However,various records indicate that M. slovakensis conodont indicates the restricted depositional environment. Considering the abundance of dominant M. slovakensis found in the Hongyan section of Baoshan,combined with previous studies on the sedimentary environment of the Dashuitang Formation in the Baoshan block,it is reasonable to conclude that the Baoshan area formed a restricted sedimentary basin during the Alaunian stage under a tectonic stretching setting. The results are helpful for understanding the evolution of the sedimentary environment during the Late Triassic period in eastern Tethys.
GUO Bao,DU Yixing,SHI Zhiqiang et al. Discovery of the Norian conodont Mockina slovakensis in Hongyan section of Baoshan area,Yunnan Province and its indication to sedimentary environment[J]. JOPC, 2024, 26(2): 373-386.
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