阿尔泰南缘巴利尔斯铁矿区斜长角闪岩LA-ICP-MS锆石U-Pb年龄及地质意义  

LA-ICP-MS U-Pb Age of the Amphibolite from Baliersi Iron Deposit and its Geological Implications in Altay,Xinjiang

作　　者：藏梅[1] 董连慧[2] 柴凤梅[1] 杨富全[3] 刘锋[3] 李强[3] 

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830046 [2]新疆维吾尔自治区地质矿产勘查开发局,新疆乌鲁木齐830000 [3]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

出　　处：《新疆地质》2013年第4期275-280,共6页Xinjiang Geology

基　　金：国家科技支撑计划项目(2011BAB06B03-02);国土资源部公益性行业专项经费项目(201211073)联合资助

摘　　要：巴利尔斯铁矿床位于新疆阿尔泰南缘麦兹盆地,产于康布铁堡组下亚组第二岩性段斜长角闪岩、变粒岩和浅粒岩中,围岩蚀变以矽卡岩化为主。本次研究对矿区2号矿体的赋矿围岩斜长角闪岩进行LA-ICP-MS锆石UPb年龄测试,29颗锆石的206Pb/238U加权平均年龄为(385±1.6)Ma(MSDW=1.2)。结合区域年代学资料,表明康布铁堡组火山岩形成时代为晚志留至早泥盆世晚期,同时限定巴利尔斯铁矿形成时代晚于385 Ma。Baliersi iron deposit is located in Maizi Basin of the south margin of Altay orogenic belt. The orebodies are hosted in the metamorphosed volcaniclastic-sedimentary rocks of the Upper Silurian- Lower Devonian Kangbutiebao For- marion. The orebodies are largely concordant with the bedding of the strata, and the wall rocks are amphibolite, granulite and leptite. Abundant skarn minerals as garnet, diopside, amphibole, epitote, chlorite are widely distributed around the orebodies. LA-ICP-MS U-Pb dating of zircon from the amphibolite in the No.2 orebody wall rock of Baliersi iron deposit has been carried out in this study. The results show that the weighted average ~＇~6PbF^U age of the 32 zircon grains is （385~ 1.6） Ma （MSDW= 1.2）. A combination of the ages of Kangbutiebao Formation in the region limits the Kangbutiebao For- mation is of Late Silurian-Early Devonian, and constraining the age of Baliersi iron deposit to 〈 385 Ma.

关 键 词：阿尔泰 巴利尔斯铁矿 LA—ICP—MS锆石U—Pb年龄 斜长角闪岩 

分 类 号：P597.3[天文地球—地球化学]