西藏措勤盆地下二叠统—下三叠统碳酸盐岩牙形石生物地层划分

Conodont biostratigraphic division of Lower Permian-Lower Triassic carbonate rocks in Cuoqin Basin, Tibet

摘要: 措勤盆地下二叠统昂杰组之上广泛发育碳酸盐岩沉积，前人先后对这套碳酸盐岩进行了解体，建立了多个地层单元。本次报道剖面为盆地中的二叠系-三叠系的连续整合沉积剖面，通过牙形石研究在这套碳酸盐岩中识别出了下二叠统-下三叠统的5个牙形石带，即：Mesogondolella siciliensis-Sweetognathodus subsymmetricus带、Mesogondolella idahoensis带、Jingondolella aserrata带、Clarkina meishanensis带、Neospathodus dieneri带，并将下拉组时代修订为下二叠统空谷期-中二叠统末。

Abstract: Carbonate sediment is widely developed above Lower Permain Angjie Formation in Coqin basin, which was disintegrated by previous research to establish several formations. Five conodont zones of Lower Permian-Lower Triassic were identified in the carbonate rocks through conodont studies, namely Mesogondolella siciliensis -Sweetognathodus subsymmetricu zone, Mesogondolella idahoensis zone, Jingondolella aserrata zone, Clarkina meishanensis zone, Neospathodus dieneri zone, and the stratigraphic age of the Xiala Formation was constrained at Lower Permian Kungurian-the later of Middle Permian.