内蒙古东乌旗朝不楞铁矿区中粗粒花岗岩SHRIMP定年及其意义  

SHRIMP dating of medium-coarse-grained granite in Chaobuleng iron deposit, Dong Ujimqin Banner, Inner Mongolia

作　　者：许立权[1] 陈志勇[1] 陈郑辉[2,3] 张彤[1,3] 张玉清[1] 

机构地区：[1]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [2]中国地质科学院矿产资源研究所,北京100037 [3]中国地质大学,北京100083

出　　处：《矿床地质》2010年第2期317-322,共6页Mineral Deposits

基　　金：内蒙古自治区地质勘查项目内蒙古重要矿产资源潜力评价及区域成矿规律研究([2007]院士3-1)"资助

摘　　要：内蒙古东乌旗朝不楞铁矿床位于二连-东乌旗多金属成矿带的东端。对与朝不楞铁矿床有密切成因联系的中粗粒花岗岩进行了SHRIMP定年,获得了(136.9±1.5)Ma的精确年龄。该年龄与成矿年龄(140.7±1.8)Ma(Re-Os)在误差范围内相一致,说明成矿作用与成岩作用基本上是同时发生的。对该带区域成矿地质背景进行分析后认为,该带以燕山期成矿为主。The Chaobuleng iron deposit is located in the Erlianhaote-Dong Ujimqin Banner polymetallic metallogenic belt of Inner Mongolia. The medium-coarse-grained granite in the area has close genetic relationship with the Chaobuleng skarn iron deposit, and hence was chosen to determine the SHRIMP U-Pb age. The results show that the granite intruded in （136.9±1.5） Ma, which is consistent to the mineralization age of （140.7±1.8） Ma （Re-Os）, suggesting that the mineralization and the rock-forming process occurred at the same time. An analysis of regional metallogenic geological setting shows that mineralization of the metallogenic belt might have occurred in Yanshanian period.

关 键 词：地质学 朝不楞矽卡岩型铁矿床 SHRIMP定年 二连-东乌旗多金属成矿带 内蒙古 

分 类 号：P618.31[天文地球—矿床学]