塔里木盆地西南缘皮亚曼-布雅一带晚石炭世腕足类动物及沉积环境

摘要

对塔里木盆地西南缘皮亚曼—布雅一带阿孜干组和塔哈奇组的岩性组合特征及其中的腕足类化石进行了研究。共鉴定出腕足类化石11属15种，分属于石燕贝目、长身贝目、扭月贝目和小嘴贝目。基于岩性组合和腕足类化石的特征，推测皮亚曼—布雅一带在晚石炭世中晚期的环境比较温暖，水体动荡、较浅，属于碳酸盐台地沉积环境；期间发生2次海退，其沉积记录分别位于阿孜干组上部与塔哈奇组顶部。%The lithological characteristics and the brachiopods of the Azigan Formation and Tahaqi Formation of Piyaman-Buya area in southwestern Tarim Basin were studied. The brachiopods were assigned to 11 genera including 15 species, belonging to Spiriferida, Productida, Strophomenida and Rhynchonellida. Based on the characteristics of the lithology and brachiopods, the authors hold that, during middle and late Late Carboniferous period, the palaeoenvironment of Piyaman-Buya was warm. The sedimentary facie was carbonate plateau, and the water was shallow and turbulent. During this period, there were two retrogressions, and the sedimentary re⁃cords were located on the upper section of Azigan Formation and at the top of the Tahaqi Formation.