甘肃北山志留纪花岗岩的厘定及其构造意义  

Determination of Silurian Granites in Beishan,Gansu and Its Tectonic Significance

作　　者：王红杰[1,2,3] 郭峰 赵海波 刘佳[1,2,3] 王伟红 WANG Hongjie;GUO Feng;ZHAO Haibo;LIU Jia;WANG Weihong(Zhengzhou Institutes of Multipurpose Utilization of Mineral Resouse,China Academy of Geological Sciences;Key Laboratory for Ploy-metallic Ores'Evaluation and Utilization of Ministry of Natural Resources;Northwest China Center for Geosience Innovation)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,河南省郑州市450006 [2]自然资源部多金属矿评价与综合利用重点实验室 [3]西北地质科技创新中心

出　　处：《现代矿业》2021年第3期1-5,共5页Modern Mining

基　　金：中国地质调查局地质调查项目(编号:DD20190067)。

摘　　要：北山地区作为中亚造山带重要组成部分,近年来一直是众多学者研究的热点。为查明北山造山带盆山演化格架,对甘肃北山夏尔陶勒地区原1∶25万马鬃山幅所划震旦纪侵入岩进行锆石测年和地球化学研究,探讨其形成时代、岩石成因和构造背景。结果显示:岩体中片麻状二长花岗岩进行锆石U—Pb年龄为443.1±9.2 Ma,形成于早志留世;岩石高SiO2(71.2%~72.67%)、富Al2O3(13.27%~15.63%)特征,富集Rb、Th,亏损Nb、Sr、Ti,表现为I型花岗岩特征。结合区域构造背景,夏尔陶勒片麻状二长花岗岩的形成与北山造山带早古生代造山运动有关,北山造山带在早志留世处在同碰撞阶段。As an important part of the Central Asian orogenic belt,Beishan region has been a hotspot for many scholars in recent years.In order to find out the basin-mountain evolution framework of the Beishan orogenic belt,zircon dating and geochemistry studies were conducted on the Sinian intrusive rocks in the original 1:250 000 Mazongshan site in the Xiaertaole area of Beishan,Gansu province,to discuss their age of formation,petrogenesis and tectonic setting.Zircon U-Pb dating of gneisserite granite in the rock mass is(443.1±9.2) Ma,which was formed in the early Silurian.The rocks are characterized by high SiO2(71.2%~72.67%) and rich Al2 O3(13.27%~15.63%),enriched Rb and Th,and lost Nb,Sr and Ti,showing the characteristics of Type Ⅰ granite.Combined with the regional tectonic setting,the formation of Chartoler gnettled monosite was related to the early Paleozoic orogeny of the Beishan orogenic belt,which was in the stage of concomitant collision in the early Silurian.

关 键 词：造山运动 片麻状花岗闪长岩 I型花岗岩 同碰撞 

分 类 号：P534.43[天文地球—古生物学与地层学] P588.121[天文地球—地质学]