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