【摘要】 通过区域地质调查,对西乌珠穆沁旗—林西北部地区的石炭二叠纪地层进行了岩石地层学研究与重新归并划分。石炭系—下二叠统本巴图组(CPb)、格根敖包组(CPg)和阿木山组(CPa)三者为石炭纪—二叠纪西乌旗海槽同期异相地层的观点,能很好的解释这几套地层的相互关系。寿山沟组(P1ss)地层呈超覆不整合覆于下面地层或地质体之上;大石寨组(P2ds)为在达到最大海泛面时(海)水下火山喷发产物;哲斯组(P2zs)为海盆地萎缩期的沉积。石炭二叠纪地层的合理划分,对于古亚洲洋封闭后的区域地层对比、构造演化和区域构造环境分析具有重要意义。更多还原

【Abstract】 On the basis of regional geologic survey of West Ujimqin, the Carboniferous—Permian strata of the West Ujimqin—Linxi area are divided into six lithostratigraphic units, namely the Gegen’aobao (CPg), the Benbatu (CPb), the Amushan (CPa), the Shoushangou (P1ss), the Dashizhai (P2ds) and the Zhesi Formations (P2z). Each unit has its obvious characteristics that can easily be indentified in the fields. The Gegen’aobao, the Benbatu and the Amushan formations are synchronous deposits, and are out-of-phase in one ocean basin. The reasonable division of the Carboniferous—Permian strata have important significance in the regional correlation, the tectonic evolutionary and regional tectonic environmental analyses after the closure of the Paleo-Asian Ocean.更多还原