摘要
本文对吉林省中部永吉县小绥河地区蛇绿岩组合中的蛇纹岩进行了锆石U-Pb定年。小绥河地区出露一套较典型的蛇绿岩,该蛇绿岩组合以超基性蛇纹岩为主。蛇纹岩存在新太古代(2719~2787 Ma)、古元古代(2391~2450 Ma)、中二叠世(270±3)Ma、早侏罗世(180~185 Ma)和早白垩世(136±2)Ma五组岩浆锆石年龄以及古元古代(2435 Ma)变质锆石年龄。其中(270±3)Ma可能代表了蛇纹岩原岩结晶时代,即小绥河蛇纹岩形成于中二叠世。
In this paper,zircon U-Pb dating of serpentinite in the ophiolite assemblage of Xiaosuihe area,Yongji County of central Jilin Province has been carried out.The outcrop of Xiaosuihe area is a set of typical ophiolite,which is mainly composed of ultrabasic ophiolite.There are five sets of magmatic zircon ages and Paleoproterozoic(2435 Ma)metamorphic zircon ages of ophiolite in Neoarchean(2719~2787 Ma),Paleoproterozoic(2391~2450 Ma),Middle Permian(270±3)Ma,Early Jurassic(180~185 Ma)and Early Cretaceous(136±2)Ma.Among them,(270±3)Ma may represent the crystallization age of the serpentine protolith,that is,the Xiaosuihe serpentine was formed in the Middle Permian.
作者
刘正阳
李翱鹏
闫冬
刘昊天
LIU Zhengyang;LI Aopeng;YAN Dong;LIU Haotian(Institute of Geological and Mineral Exploration and Development of Jilin Province,Changchun 130102,Jilin,China;Institute of Geological Survey of Jilin Province,Changchun 130102,Jilin,China;Institute of Geological Sciences of Jilin Province,Changchun 130012,Jilin,China)
出处
《吉林地质》
2022年第4期1-6,13,共7页
Jilin Geology
