东昆仑中段沙松乌拉地区花岗闪长岩锆石U-Pb年龄及其地质意义  

U-Pb Age and Geological Significance of Granodiorite Zircon in Shasongwula Area of Middle East Kunlun

作　　者：付军[1] 董进生[1] 孙宏亮[1] 白建海[1] Fu Jun;Dong Jinsheng;Sun Hongliang;Bai Jianhai(Qinghai Institute of Geological Survey,Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau,Xining,Qinghai,810012,China)

机构地区：[1]青海省地质调查院,青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012

出　　处：《化工矿产地质》2020年第4期298-302,共5页Geology of Chemical Minerals

基　　金：青海1:5 万沙松乌拉山地区四幅区域地质调查项目(1212010918020)。

摘　　要：沙松乌拉地区地处北昆仑岩浆弧和南昆仑结合带的结合部位;通过LA-ICP-MS方法对研究区的花岗闪长岩进行锆石的U-Pb同位素年龄测试,结果表明206Pb/238U年龄加权平均值为Mean=246.7±1.2Ma,即花岗闪长岩的结晶年龄,该花岗闪长岩形成的地质时期为早三叠世;花岗闪长岩产于中生代岩浆弧环境,成岩时代的确定对于在该区寻找构造蚀变型金矿具有重要的地质意义。Shasongwula area is located in the junction of North Kunlun magmatic arc and South Kunlun.The U-Pb isotope age of the granodiorite in the study area was measured by La-ICP-MS method.The results show that the weighted average value of 206Pb/238U age is Mean=246.7±1.2Ma,which is the crystallization age of granodiorite,the geological period of the formation of granodiorite is the early Triassic epoch.Granodiorite occurs in Mesozoic magmatic arc environment,and the determination of diagenetic age is of great geological significance for finding tectonic altered gold deposits in this area.

关 键 词：沙松乌拉地区 锆石U-PB 年龄 花岗闪长岩 地质意义 

分 类 号：P588.12[天文地球—岩石学] P597[天文地球—地质学]