云南保山红岩剖面诺利期牙形石Mockina slovakensis的发现及其对沉积环境的指示OA北大核心CSTPCD

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 de-posits 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 con-strained to the late Alaunian of Norian period.Its presence and abundance can provide valuable insights in-to the paleoenvironmental conditions and depositional settings.M.slovakensis is known for strong adaptabil-ity to a diverse living environments,including both shallow and deep oceanic environment,as well as re-stricted sea to open sea.However,various records indicate that M.slovakensis conodont indicates the re-stricted 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.