安徽怀宁泉涧冲银多金属矿床地质特征及找矿标志

GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS OF THE QUANJIANCHONG SILVER POLYMETALLIC DEPOSIT IN ANHUI PROVINCE

安徽怀宁泉涧冲银多金属矿区位于长江中下游铜铁(多金属)成矿带黄梅-怀宁成矿区,区内董岭背斜核部洪镇岩体侵入形成"底辟侵入-伸展-层滑构造"构成本区的基本构造格架,与构造和岩浆热液作用有关的银铅锌多金属矿床普遍发育。通过对本矿区银多金属矿床地质特征及找矿标志的研究,认为炭硅质板岩与碳酸盐岩界面是有利的成矿部位,强烈的岩浆活动为成矿提供了大量含矿热液,北东向滑脱构造是本区主要的导矿、赋矿构造,特殊的构造部位是银多金属矿重要的赋存场所。

The Quanjianchong silver polymetallic deposit is located in the Huangmei-Huaining mineralization region within the Cu-Fe （polymetallic） metallogenic belt along the middle and lower reaches of Yangtze River. The diapirie invasion-extension-gliding structure formed by the Hongzhen granite intrusion into the core of Dongling anticline constitutes the basic structural framework of this region. The Ag-Pb-Zn polymetallic deposits that are related to tectonics and magmatic hydrothermal process are broadly developed in the area. With study on the geological characteristics and prospecting indicators of the silver polymetallic deposits in the orefield, it is concluded that the interfaces between the carbonaceous siliceous slates and carbonate rocks are advantageous metallogenie positions. Severe magmatism provides a large number of ore-bearing hydrothermal solutions for mineralization. The NE-trending detachment structures in the area serve as the ore-guiding and hosting structures. Special structural positions are important occurrences for silver polymetallic ore enrichment.