An instance of comprehensive geophysical prospecting features and quantitative interpretation of a quartz-vein-type gold deposit in Northwest China
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摘要: 石英脉型金矿床是岩浆期后热液及变质热液作用的产物,受主断裂及次级断裂构造控制,成矿物质主要来自围岩。该类型金矿在西北多有分布,宽度一般较窄,在走向和延伸方向断续分布。单一物探方法有局限性,难以做出全面、合理的解释。本文以西北某石英脉型金矿为例,对此类矿床进行了重、磁、电综合物探工作并进行了正反演计算和定量预测。结合地质成矿条件、物探相关理论及正反演计算,推断了控矿断裂构造,定量预测了的赋矿体。过程中,各方法互相衔接,互相验证,定量解释预测,是综合物探在石英脉型金隐伏矿体找矿方面进行的有效尝试。Abstract: Gold deposits of the quartz-vein-type are the product of post-magmatic hydrothermal and metamorphic hydrothermal processes and are generally controlled by major and secondary faults. Their metallogenic materials originate from the surrounding rocks. The assemblages and contents of metal sulfides in ores of various deposits differ with geological setting and ore-forming and controlling conditions. Moreover, sulfide-gold-quartz ores predominate. The gold deposits of this type have distinct comprehensive geophysical prospecting features, and various physical prospecting methods yield a high degree of regularity. Taking a gold deposit of the quartz-vein-type in northwest China as an example, this study carried out comprehensive physical prospecting of deposits of this type, performed a quantitative prediction based on forward modeling, and conducted interpretation and analysis by combining theories related to geophysical prospecting.
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