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矿床地质  2012 

内蒙古东部敖脑达坝铜-银-锡矿区附近发现晚石炭世地层

Keywords: 地质学,二叠系,晚石炭世,LA-MC-ICP-MS锆石测年,敖脑达坝,内蒙古

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Abstract:

在内蒙古东部的大兴安岭中南段地区,具有工业价值的多数大中型银多金属矿床均产于二叠系中。笔者在敖脑达坝铜-银-锡矿床开展研究时,对该矿区西部出露的凝灰质板岩取样并开展了LA-MC-ICP-MS测年工作,获得的锆石U-Pb年龄为(302.6±1.9)Ma,MSWD=2.0,表明凝灰质板岩的原岩形成年代为晚石炭世,而不是前人认为的二叠纪。这一新发现可能对重新认识该区的区域地质演化具有重要意义。

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