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马达加斯加金矿床成因及找矿标志研究 被引量:2

Research on Genesis and Prospecting Indicators of Gold Deposits in Madagascar
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摘要 马达加斯加金矿床类型为石英脉型,金矿化包括含金石英脉及其两侧的矿化围岩,金矿体产在NNW向剪切带和EW向断层交会处。金成矿作用主要与泛非造山运动有关。在泛非造山期,马达加斯加发生了强烈的构造岩浆活动,地壳深部含金硅铝质岩发生部分熔融形成花岗质岩浆。花岗质岩浆从岩石中萃取成矿组分,形成含矿热液流体。沿断裂上升的热液流体与地下含矿热水混合,构成岩浆水与大气降水的混合成矿流体,这些成矿流体进入构造有利空间,充填和交代围岩,形成含金石英脉。 The gold deposit in the Madagascar is a classical quartz vein type gold deposit,the gold mineralization developed in the quartz vein and its wall rock.The gold deposit is intersected by major NNW trending shear zones and east-trending fracture sets,gold mineralization is associated with Pan-African orogeny.In the Pan-African orogeny,there are intensive tectonic-magmatic in Madagascar,results partial melting of the lower crust,a large amount of fluids and granitic magma are formed.In the process of the ascent of the fluids,mixed shallow-sourced meteoric fluid,the ore-forming fluids would have entered the favourable faults,resulting in mineralization.
出处 《黄金科学技术》 CSCD 2014年第2期1-6,共6页 Gold Science and Technology
基金 中国博士后科学基金项目"马达加斯加Maevatanana金矿床成因研究"(编号:2013M541000) 中国地质调查局地质大调查项目"全球巨型成矿带找矿勘查方法技术研究"(编号:12120113102100)联合资助
关键词 金矿床 泛非造山运动 含金石英脉 太古宙 条带状铁建造 绿岩带 马达加斯加 gold deposit Pan-African orogeny auriferous quartz veins Archean banded iron formation greenstone belt Madagascar
作者简介 杨喜安(1972-),男,宁夏海原人,博士,从事矿床学研究工作.yangxianyantai@163.com
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