摘要
本文通过对吉中地区下二叠统大河深岩组地质剖面的测制及LA-ICP-MS锆石U-Pb年代学研究,对其岩石学特征及成岩时代进行了探讨。研究表明,大河深岩组为一套中酸性火山岩组合,并夹少量粉砂岩;其变流纹岩锆石U-Pb加权平均年龄值为296.5±2.2 Ma(MSWD=2.3,n=16),该年龄可以代表大河深岩组的形成年龄,时代为早二叠世。
Through the measurement of geological sections and the study of LA-ICP-MS zircon U-Pb chronology, the petrological characteristics and diagenetic age of lower Permian Daheshen Formation in central Jilin Province are discussed in this paper. The research shows that Daheshen Formation is a combination of intermediate acid volcanic rocks with a small amount of siltstones. The weighted mean value of zircon U-Pb in the metamorphic rhyolite is 296.5±2.2 Ma(MSWD=2.3, n=16), which can represent the formation age of Daheshen Formation, and the age is early Permian.
作者
赵大印
王迪
ZHAO Dayin;WANG Di(Institute of Geological Sciences of Jilin Province,Changchun 130000,Jilin,China;Property Management Center of Bureau of Geologic Exploration and Mineral Development of Jilin Province,Jilin,Changchun 130061,Jilin,China)
出处
《吉林地质》
2022年第1期12-18,共7页
Jilin Geology
关键词
吉中地区
大河深岩组
地层
Central Jilin Province
Daheshen Formation
stratum
