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矿床地质  2010 

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

Keywords: 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

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Abstract:

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。

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