桂林理工大学学报2018，Vol.38Issue(4)：647-653,7.DOI:10.3969/j.issn.1674-9057.2018.04.005
松潘-甘孜造山带中部年轮寺北岩体锆石LA-ICP-MS年代学及地质意义
LA-ICP-MS zircon U - Pb ages and geological significance of Nianlunsi rock, middle Songpan - Ganze fold belt
摘要
Abstract
In the middle of the Songpan - Ganze orogenic belt,there is an Nianlunsi rock mass with pyroxene biotite diorite lithology,which has not yet been chronologically studied. In this article,the method of zircon LAICP- MS U - Pb dating was used,and the author yielded the weighted average 206Pb /238U age of 212. 3 ± 1. 4 Ma(MSWD = 0. 68,n = 13) and 199. 2 ± 2. 1 Ma(MSWD = 2. 1,n = 6) . The result shows that the initial crystallization period of the magma of the Nianlunsi rock was at late Triassic,accompanied by regional orogeny,it experienced two stages of magmatic activities. 212. 3 ± 1. 4 Ma was the main stage of magmatic activities,while 199. 2 ± 2. 1 Ma was the secondary stage of regional magmatic activities. The diagenetic process of granite in the Songpan Ganze orogenic belt continues from 243 ± 4 Ma to 181. 2 ± 1. 4 Ma,and most of the granite diagenetic ages are concentrated between 229 ± 3 Ma and 205 ± 1 Ma,suggesting that the Songpan - Ganze orogenic belt began magmatic activity at Late Triassic. Orogenic action occurs mainly in the late Indosinian period. According to the previous research,it is the post-collision tectonic environment,that formed the Nianlunsi rock by crustal materials partial melting, such as slate,phyllite,silty slate,and so on,from Xinduqiao Formation of Xikang Group.关键词
辉石黑云闪长岩/LA-ICP-MS锆石U-Pb年代学/西康群/年轮寺/松潘-甘孜造山带Key words
pyroxene-biotite diorite/LA-ICP-MS zircon U - Pb data/Xikang Group/Nianlunsi/Songpan - Ganze fold belt!分类
天文与地球科学引用本文复制引用
周雄,周玉,张贻,李名则,徐云峰,叶亚康..松潘-甘孜造山带中部年轮寺北岩体锆石LA-ICP-MS年代学及地质意义[J].桂林理工大学学报,2018,38(4):647-653,7.基金项目
中国地质调查局项目(DD20160074) （DD20160074）
