贵州安顺地区P-T之交岩性特征及其牙形刺

Lithologic Characteristics and Conodonts at the Intersection of P-T in Anshun,Guizhou

笔者以贵州安顺地区轿子山剖面为研究对象,在硅质泥岩中化学分离出了一定数量的牙形刺,鉴定出了2个属(Clarkina属和Hindeodus属)13个种。根据所发现牙形刺的特征及其在剖面地层中的分布,在该剖面上确认了5个可与邻区对比的牙形刺生物带,牙形刺Hindeodus parvus出现在JZS5-3-3层,因此初步确定二叠系—三叠系界线位于JZS5-3-3层,利用牙形刺的分布初步划定了该剖面二叠系—三叠系界线。

Based on the study of the Jiaozishan section located in Anshun of Guizhou province,the authors obtained a large number of conodonts from Siliceous mudstone by chemical separation,they described conodonts systemically,which belong 2 families and 13 species,they are belong to the Clarkina genus and Hindeodus genus. Based on conodonts’ s characteristics and distribution in Xinming section,the conodonts were divided into 5 zones,which can compared with neighboring areas,Hindeodus parvus was discovered at 5-3-3,so primarily determined the boundary of Permian-Triassic at 5-3-3.