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矿床地质  2002 

东川式层状铜矿40Ar-39Ar成矿年龄研究:华南地区晋宁-澄江期成矿作用新证据

Keywords: 40Ar-39Ar法,流体包裹体,东川铜矿,晋宁,澄江期

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Abstract:

本文采用40Ar-39Ar真空击碎技术和阶段加热技术,测定了采自落雪矿的“东川式”层状铜矿之两个石英样品的年龄,获得了810~770Ma的40Ar-39Ar等时线年龄,这是首次获得的“东川式”铜矿的成矿年龄。这些年龄与作者以前获得的脉状铜矿石英的年龄范围一致,远远小于赋矿围岩落雪组的年龄。研究结果表明“东川式”层状铜矿并非沉积成因,与脉状铜矿一样,也是热液成因,并且再次证实晋宁-澄江期是东川铜矿的主要成矿期。

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