【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。更多还原

【Abstract】 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.更多还原