黄金科学技术 ›› 2014, Vol. 22 ›› Issue (2): 1-6.doi: 10.3969/j.issn.1005-2518.2014.02.001
• 矿产勘查与资源评价 • 下一篇
杨喜安1,刘善宝1,赵宪东2
YANG Xi’an1,LIU Shanbao1,ZHAO Xiandong2
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。
中图分类号:
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