新疆西准噶尔达尔布特断裂带南包古图组安山岩LA-ICP-MS锆石U-Pb测年及地质时代  

ZIRCON LA-ICP-MS U-PB DATING AND GEOLOGIC AGE OF THE BAOGUTU FORMATION ANDESITE IN THE SOUTH OF DAERBUTE FAULTED ZONE,WESTERN JUNGGAR

作　　者：佟丽莉[1] 李永军[1] 张兵[2] 刘静[1] 庞振甲[1] 王军年[2] 

机构地区：[1]长安大学地球科学与资源学院,西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]新疆地质矿产勘查开发局第七地质大队,新疆乌苏833000

出　　处：《新疆地质》2009年第3期226-230,共5页Xinjiang Geology

基　　金：国家自然科学基金项目(40534020);新疆维吾尔自治区地质矿产调查项目(XJQDZ2003-24)共同资助

摘　　要：对达尔布断裂带南包古图组安山岩中锆石进行LA-ICP-MS测年,获得锆石U-Pb年龄(345.6±6.2) Ma,MSWD=1.14.据此确定该安山岩形成于早石炭世,为包古图组时限约束提供了科学依据,并为包古图组与上覆希贝库拉斯组新老关系确认等提供佐证.LA-ICP-MS dating technique was used to determine the zircons from Baogutu Formation of the south Daerbute faulted zone, and yielded zircon U-Pb age value of 345.6±6.2Ma （MSWD=1.14,95% confidence）. With the relevant data synthesized, the andesite was considered to form in the Early Caiboniferous. The result restricts the date of Baogutu formation scientifically, and provides important evidence for basic geological questions ： affirming chronogensis of Baogutu and Xibeikulasi Formations,and so on.

关 键 词：西准噶尔 早石炭世 安山岩 LA-ICP—MS锆石U—Pb测年 

分 类 号：P597.3[天文地球—地球化学]