西天山赛里木湖北达巴特地区下二叠统乌郎组火山岩构造环境及时代判别

Structural Environment and Age Discrimination of Volcanic Rocks in the Lower Permian Wulang Formation of the Dabate Area of Northern Sailimu Lake in the Western Tianshan Mountains

通过对赛里木湖北达巴特地区分布的下二叠统乌郎组火山岩岩石类型、成因特点及区域构造背景研究,分析岩石学和地球化学特征,为陆相火山岩沉积,具大陆裂谷火山岩特点。火山岩以玄武岩、安山岩、英安岩及火山碎屑岩为主,为非造山环境的大陆构造环境。通过生物化石、岩性特征及该地区已获得同位素成果,确定下二叠统乌郎组为早二叠世火山活动产物。

Through the study of the rock type,genetic characteristics and regional structural background of the Lower Permian Wulang Formation in the north Damat region of Saiimu Lake,the petrographic and geochemical characteristics are analyzed,and the results show that continental volcanic deposition has continental rift volcanic characteristics.Volcanic rocks are mainly basalt rock,andesite rock,England rock and pyroclastic rocks,which are continental tectonic environments with non-orogenic environment.The Lower PermianWulang Formation is the product of the early Permian volcanic activity,as determined by biological fossils,lithological characteristics and isotopic data results.