豫西成矿带嵩箕地区铅族矿物自然重砂异常及其找矿意义
Natural heavy mineral anomalies of lead minerals in Songji area of the West Henan metallogenic belt and their prospecting significance
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摘要: 采用自然重砂数据库系统（ZSAPS2.0）对河南省1∶20万自然重砂测量数据进行综合分析，在嵩箕成矿亚区圈出了9个铅族矿物自然重砂异常，其中3个为Ⅱ级异常，6个为Ⅲ级异常。这些异常的矿物组成相对简单，以铅族矿物为主，伴生有铜族矿物及少量锌族矿物和辰砂、雄黄、雌黄、自然金等，异常主要分布于下古生界寒武系碳酸盐岩地层区，与已有矿点的矿物组合对比表明，异常由寒武系碳酸盐岩中MVT型铅锌矿引起，对该区找矿有重要的指示意义。Abstract: 1∶200000 natural heavy mineral database in Henan Province was analyzed comprehensively with Natural Heavy Mineral Database System (ZSAPS 2.0), and nine anomalies of lead minerals were delineated in the Songji metallogenic subbelt, comprising 3 Grade Ⅱ anomalies and 6 Grade Ⅲ anomalies. The heavy mineral assemblage in these anomalies is relatively simple. Lead minerals, such as galena, cerussite, lead alum, pyromorphite, and native lead, constitute the main minerals, which are associated with copper minerals (malachite, chalcocite, native copper, cuprite, etc.) and minor zinc minerals (sphalerite, smithsonite, etc.), cinnabar, realgar, orpiment, native gold, etc. The anomalies mainly occur in Lower Paleozoic Cambrian carbonate strata. A comparison with mineral assemblages of the existing ore spots shows that the anomalies are caused by the Cambrian carbonate MVT lead-zinc deposits, and this finding is significant for ore-prospecting work in this area.
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