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矿床地质  2005 

云南会泽铅锌矿床粘土矿物K-Ar测年及其地质意义

Keywords: 地球化学,K_Ar年龄,粘土矿物,成矿作用,会泽铅锌矿,云南

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Abstract:

文章应用K_Ar法测得会泽铅锌矿床矿体中的蚀变粘土矿物年龄为(176.5±2.5)Ma,该年龄为成矿作用第一阶段黄铁矿形成的年龄,略早于第二阶段方铅矿、闪锌矿和方解石的形成年龄。该年龄表明这些铅锌矿床的形成与峨眉山玄武岩浆活动(251~262Ma)有明显的时间间隔,而可能为特提斯板块向大陆俯冲期间在大陆边缘岩浆弧后伸展带形成的MVT矿床。

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