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湖北随州黑龙潭金矿石英Rb-Sr同位素年龄及其地质意义

Sanguo PENG,Junliang HU,Jinsong LIU,Jiang ZHU,Yinjie GONG

Geological Bulletin of China（2017）

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Abstract
通过矿物流体包裹体Rb-Sr同位素测年,获得鄂北黑龙潭金矿石英Rb-Sr等时线年龄为132.6±2.7Ma,表明该金矿床形成于早白垩世中期.矿石石英中流体包裹体Sr同位素初始比(87Sr/86Sr)i平均值为0.710798,小于陆源硅酸盐的值(0.720),高于地幔Sr的初始值(0.707),暗示成矿物质来源于壳幔混合.结合各类岩矿石Au丰度变化,S、Pb、H、O等同位素组成,以及稀土和微量元素特征、成矿流体等研究,认为该矿床的形成可能与燕山期持续伸展阶段大规模构造-岩浆活动有关,燕山期中酸性岩浆活动为金矿成矿提供了主要矿源和热源.
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Key words
quartz,Rb-Sr isochron age,metallogenic epoch,Heilongtan gold deposit,geochemistry
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