新疆阿尔泰两棵树铁矿区二长花岗岩LA-ICP-MS锆石定年及地质意义  

LA-ICP-MS U-Pb Age of the Monzonitic Granite from Liangkeshu Iron Deposit and Its Geological Implications in Altay,Xinjiang

作　　者：姜丽萍[1] 柴凤梅[1] 杨富全[2] 刘锋[2] 张志欣[2] 耿新霞[2] 吕书君[3] 

机构地区：[1]新疆大学地质与勘查工程学院,新疆乌鲁木齐830049 [2]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点开放实验室,北京100037 [3]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2011年第4期712-719,共8页Geoscience

基　　金：国家自然科学基金项目(40972069;40863001);新疆维吾尔自治区自然科学基金项目(2010211A08);"十一五"国家科技支撑计划重点项目(2006BAB07B02-01);中国地质调查局地质调查工作项目(1212010786006)

摘　　要：新疆阿尔泰两棵树铁矿床位于阿尔泰南缘克朗盆地,产于花岗岩体与地层接触带的伟晶岩脉中。应用LA-ICP-MS锆石U-Pb测年法,获得该矿区花岗岩的结晶年龄为(376.7±1.3)M a,属中泥盆世晚期岩浆活动的产物,同时该年龄限定两棵树铁矿床为中泥盆世晚期成矿。它与同时代的花岗岩有相同的构造背景,即形成于活动大陆边缘环境。The Liangkeshu iron deposit in Xinjiang Uygur Autonomous Region is located in the Kelang basin at the south margin of Altay orogenic belt.It occurs in pegmatite dikes found in the contacts between the monzoni-tic granite pluton and stratum.LA-ICP-MS zircon UPb method yields a（376.7±1.3） Ma age of granite crystallization.This age indicates that the granite is the product of magmatic activities occurred in late Middle Devonian,meanwhile the age limits that Liangkeshu pegmatite iron deposit formed in late Middle Devonian.The granite has the same tectonic background as the contemporary granite,namely formed in active continental margin environment.

关 键 词：LA-ICP-MS 二长花岗岩 伟晶岩型铁矿 阿尔泰南缘 新疆 

分 类 号：P588.121[天文地球—岩石学]