贵州英坪钼镍多金属矿地质特征及成矿条件

区内早寒武世黑色岩系是由下至上分别为古风化壳、上磷矿层、钼镍多金属层、高炭质泥岩、炭质泥岩、含炭质泥岩的岩性组合,主要以泥炭质为主;具有黄铁矿化、硅化、碳酸盐化、重晶石化等蚀变现象;其中,古风化壳、上磷矿层不完全发育,而高炭质泥岩稳定产出可作为找矿标志层。英坪钼镍多金属层赋存于黑色岩系底部,为多金属硫化物、黏土矿物及高炭质泥岩组成的细层;顶底板标志清晰,界限分明,特征典型;矿石矿物以硫化物为主,脉石矿物以黏土、硅质、炭质为主,矿石结构以泥质(粉砂质)砾(粒)屑结构为主,矿石构造以叠层状构造为主。根据矿体(层)地质特征、沉积环境等综合分析,区内成矿条件主要受着地层岩性、古构造运动、岩相古地理及生物作用等多种因素的制约;根据矿体(层)赋存层位、岩性组合、顶底板特征、蚀变现象等综合分析,建立了本区的找矿标志。

Geological characteristics and metallogenic conditions of Yingping molybdenum-nickel polymetallic layer in Guizhou Province

The Early Cambrian black rock series in the area are lithologic combinations of paleo-weathering crust, upper phosphate rock layer, molybdenum-nickel polymetallic layer, high carbonaceous mudstone, carbonaceous mudstone and contain carbonaceous mudstone,it is mainly peat-based; it has alteration phenomena such as pyrite mineralization, silicification, carbonation, and barite; among them, the paleo-weathering crust and the upper phosphate rock layer are not fully developed, while the high carbonaceous mudstone is stable and can be used as a layer for prospecting. The Yingping molybdenum-nickel multi-metal layer is located at the bottom of the black rock series and is a fine layer composed of polymetallic sulphides, clay minerals and high carbonaceous shale,the top and bottom plates are clearly marked with distinct boundaries and typical features. The ore minerals are mainly sulfides,the gangue minerals are mainly clay, siliceous and carbonaceous,the ore structure is mainly composed of muddy (silt) gravel (grain) crumbs, and the ore structure is mainly composed of laminated structures. According to the comprehensive analysis of the ore body (layer) geological characteristics and sedimentary environment, the ore-forming conditions in the area are mainly restricted by various factors such as stratum lithology, paleo-tectonic movement, lithofacies palaeogeography and biological effects; According to the comprehensive analysis of the ore body (layer) occurrence layer, lithology combination, top and bottom plate characteristics, alteration phenomena, etc., the prospecting mark of this area was established.