塔里木盆地大坂塔格奥陶系地层层序及沉积演化

塔里木盆地大坂塔格—一间房奥陶系剖面自下而上可划分为蓬莱坝组、鹰山组、一间房组、吐木休克组和良里塔格组,下与寒武系下丘里塔格组整合接触,顶部出露不全,为第四系覆盖。该剖面由下至上可以识别出6个三级层序,每个层序由海侵体系域和高水位体系域构成,缺少低水位体系域,密集段由深灰色—灰色泥质灰岩、泥晶灰岩等组成。碳酸盐台地为本区典型沉积,海平面升降变化是控制该区沉积相发育和分布的主要因素。

ORDOVICIAN SEQUENCE STRATIGRAPHY AND SEDIMENTOLOGY IN THE DABANTAGE AREA,TARIM BASIN

The Ordovician Dabantage section was measured.The total thickness of the Ordovician strata in the section is 1013.38m.According to detailed observations,systematic sampling,and sequence boundary analysis,the Ordovician System of the Dabantage section was divided into the Penglaiba,Yingshan,Yijianfang,Tumuxiuke and Lianglitage formations,including 6 third-order class sequences,each of which consists of a transgression systems tract and a high systems tract,but not a lowstand systems tract.The Dabantage section records sedimentation on a carbonate platform.Sea level changes were the principal factor that affects the development of depositional systems.