内蒙古西部银额盆地及邻区二叠系隆林阶—冷坞阶层序地层格架

依据露头层序地层学原理，对银额盆地及邻区二叠系隆林阶—冷坞阶露头剖面进行层序界面的识别和层序划分，共划分为2个Ⅲ级层序。在对东西、南北向层序地层对比的基础上，初步建立了研究区的层序地层格架。隆林期—罗甸期全区发生大范围的海侵接受海相沉积，以滨海—浅海陆棚相为主，局部发育碳酸盐岩台地相，盆地边缘发育过渡相沉积，有2个沉积中心，黑鹰山-额济纳旗坳陷带的沉积中心在碧云泉南-芦草井地区，柳园-巴丹吉林坳陷带的沉积中心在卡路山-杭乌拉一带。祥播期-冷坞期继承了前期的沉积格局，只是沉积范围向北西缩小，黑鹰山-额济纳旗坳陷带的沉积中心在芦草井地区，柳园-巴丹吉林坳陷带水体变浅，沉积中心在古硐井地区。

The sequence stratigraphic framework of Permian Longlinian-Lengwuan Stage in Yingen-Ejin Banner basin and its adjacent areas, western Inner Mongolia

According to the basic principles of outcrop sequence stratigraphy, the strata of Permian Longlinian-Lengwuan Stage in Yingen-Ejin Banner basin and its adjacent areas are divided into two third-order sequences through sequence interface identification and sequence classification. The sequence stratigraphic framework of the study area was established by comparing E-W-trending and N-S-trending sequence stratigraphic criteria. In Permian Longlinian-Luodianian Stage, the study area was of marine facies deposition through marine transgression, mainly developed offshore and neritic shelf facies sediments, and partly developed carbonatite plateau facies, with the development of transition facies sediments along the boundary of the basin. It had two depocenters. The depocenter of Heiyingshan-Ejin Banner depression was Biyunquannan-Lucaojing area, whereas the depocenter of Liuyuan-Badanjilin depression was Kalushan-Hangwula area. The study area inherited the sedimentary framework of the early Permian Xiangboan-Lengwuan Stage, only the deposition range shrank northwestward. The depocenter of Heiyingshan-Ejin Banner depression was Lucaojing area. The water body of Liuyuan-Badanjilin depression became shallow，and the depocenter was Gudongjing area.