西天山那拉提岩群SHRIMP锆石U-Pb年龄及地质意义  

Zircon SHRIMP U-Pb Dating of Nalati Group in Western Tianshan and its Geological Significance

作　　者：刘崴国[1] 张建东[1] 班建永[1] 田少亭[1] 李鹏[1] 李凯强[1] 贺光前[1] 

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第一区域地质调查大队,新疆乌鲁木齐830013

出　　处：《新疆地质》2016年第2期157-163,共7页Xinjiang Geology

基　　金：中国地质调查局国土资源大调查项目(12120113042300)资助

摘　　要：新疆西天山那拉提构造带划归志留系,据岩性组合、变质变形特征、所含古生物化石及同位素测年结果,明显分为两部分,含珊瑚化石的大理岩、火山碎屑岩等浅变质岩系为上—顶志留统巴音布鲁克组;不含化石的中深变质岩为古元古界那拉提岩群。本次研究对艾肯达坂黑云斜长片麻岩、备战铁矿南侧条带状片麻岩进行锆石SHRIMP U-Pb测年,获得年龄值(945.9±4.4)Ma、(924±9)Ma,表明为Rodinia大陆聚合事件格伦维尔造山运动在本区的反映。Xinjiang Nalati tectonic belt of Western Tianshan Mountains in the original Silurian,According to the characteristicsof deformation,metamorphic lithology combination,the fossils and isotopic dating results, Was divided into twoparts：With Coral fossils of marble、volcanic clastic rocks Belong to Upper Silurian Bayinbuluke formationThe mesometamorphicrock without fossils belongs to the paleo Proterozoic Nalati rock group,zircon SHRIMP U-Pb Dating of biotiteplagioclase gneiss in Aikendaban、banded gneiss in the South side of Beizhan iron ore results are （945.9±4.4）Ma、（924±9）Ma,Represents a Rodinia continental convergence event that Grenville orogeny reflecting in the area.

关 键 词：新疆西天山 那拉提岩群 SHRIMP锆石U-PB测年 格伦维尔造山运动 

分 类 号：P597.3[天文地球—地球化学]