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地球学报  2008 

河南板厂银多金属矿床钾长石氩-氩年龄及其地质意义

DOI: 10.3975/cagsb.2008.02.04

Keywords: 氩-氩法定年,钾长石,银铜铅锌(钼)矿床,板厂,河南

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Abstract:

河南内乡板厂矿床通过近年来的勘查工作,为一大型斑岩-热液型银铜铅锌(钼)矿床.本文对该矿床斑岩型铜矿石中钾长石进行了Ar-Ar定年,获得两个年龄坪:900~1150℃年龄坪包括了43.4%的39Ar,坪年龄为(148.1±1.6)Ma,反等时线年龄为(145.7±2.3)Ma;1200~1450℃年龄坪包括了48.8%的39Ar,坪年龄为(161.0±1.6)Ma,反等时线年龄(159.0±14.0)Ma.前者代表了该矿床的成矿年龄,后者代表了含矿斑岩的成岩年龄.该二阶段年龄谱特征反映了板厂矿床成岩成矿的阶段性.在我国不少矿区的Ar-Ar法年龄谱上均有多坪显示,这与我国许多矿区成矿作用和构造事件的多期多阶段特征一致.

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