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矿床地质  2005 

小秦岭地区中深部含金石英脉的同位素地球化学特征及其意义

Keywords: 地球化学,含金石英脉,氢、氧、硫、氦、氩同位素,成矿作用,伸展构造,小秦岭

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Abstract:

对小秦岭地区中深部含金石英脉的氢、氧、硫、氦和氩同位素地球化学研究表明,本区的成矿流体主要来源于深部,随着成矿过程的进行,表现出深源流体不断与浅部流体混合的演化趋势。结合前人的研究成果,根据成矿作用与区域伸展构造演化之间的耦合关系,指出小秦岭地区金的成矿作用主要发生于中生代晚期的后碰撞阶段,在由深部过程引发的伸展构造背景下,深部流体沿伸展构造系统向上运移,不断与浅部流体混合,与围岩发生水_岩相互作用,使流体系统中的成矿物质不断富集,最终在剪切扩容空间中富集成矿。

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