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地球学报  2008 

江西金山金矿含金黄铁矿的Rb-Sr年龄

DOI: 10.3975/cagsb.2008.05.09

Keywords: 金矿,成矿时代,Rb-Sr定年,物质来源,江西金山

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Abstract:

前人对江西金山金矿的成矿时代有许多不同的认识,笔者通过对江西金山蚀变岩型矿石中的含金黄铁矿Rb-Sr年龄的测定得出,含金黄铁矿的Rb-Sr等时线年龄为(838±110)Ma,initial87Sr/86Sr=0.7045±0.0020。由此可以推测晋宁期是蚀变岩型金矿体形成的主要时期。黄铁矿Rb-Sr所得的Sr同位素初始比(87Sr/86Sr)i小于陆源硅酸盐的值(0.720),而与玄武岩的值(0.704)接近,结合前人有关的同位素及稀土、微量元素研究,笔者认为金山金矿变质岩型矿体的成矿物质源于变质围岩,成矿流体为来源于深部的变质水。

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