地质通报2018，Vol.37Issue(4)：604-612,9.
青海石底泉地区宗务隆构造带花岗闪长岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb ages and geological sig-nificance of granodiorite from Zongwulong tectonic belt in Delingha,Qinghai Province
摘要
Abstract
Based on a study of zircon U-Pb dating and rock geochemical analysis of granodiorite from Zongwulong tectonic belt in Shidiquan area of Delingha,the authors revealed that the granodiorite has the characteristics of island arc or active continental margin granite.The original rock may be salic crust or the product of crustal melting formed in Early Neoproterozoic(870.0±4.5Ma).The granodiorite samples yielded ages of 870.0±4.5Ma and 443.3±2.3Ma respectively.The age of 870.0±4.5Ma represents provenance in-herited zircon age,which reflects the tectonic magmatic event during the Neoproterozoic,whereas the other age of 443.3±2.3Ma in-dicates the time of zircon crystallization of the granodiorite, which shows that the emplacement occurred in the Late Ordovician. Comprehensive analyses suggest that the granodiorite in the Zongwulong tectonic belt was related to plate convergent collisional orogeny of the Caledonian period on the northern margin of the Qaidam Basin, confirming that the formation of the rock in the Zongwulong tectonic belt did not wholly occurred in Hercynian-Indosinian period.关键词
宗务隆构造带/花岗闪长岩/LA-ICP-MS锆石U-Pb年龄/地球化学特征Key words
Zongwulong tectonic belt/granodiorite/LA-ICP-MS zircon U-Pb age/geochemical characteristics分类
天文与地球科学引用本文复制引用
孙健,杨张张,赵振英,田振,孙东亮,李大磊,杨强晟,李小明..青海石底泉地区宗务隆构造带花岗闪长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2018,37(4):604-612,9.基金项目
中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》(编号:DD20160012) （编号:DD20160012）
