黄铁矿型铜多金属矿床地球化学元素组合及找矿评价标志

黄铁矿型铜多金属矿床是与海底火山喷发—沉积建造有关的火山岩矿床,矿化赋存于一套微量元素总体含量水平较高的海相中酸性细碧角斑岩系中。赋矿地层、岩性具有以Cu,Pb,Zn为主,伴生Sb,Ba,Ag,As,Bi,Hg,Cd等多元素的特征组合,这些元素在成矿区域上形成大范围的地球化学异常,其主体异常对应于矿田。矿区大比例尺的岩石地球化学测量显示,这些指示元素的清晰的原生异常相互交替叠置于矿床内矿化富集部位,水平分带不甚明显,而垂直分带清晰。具有不同指示意义的元素组合于矿化的不同部位聚集而出现的分带,是用于评价矿化剥蚀程度及其成矿远景的重要地球化学参量

GEOCHEMICAL ELEMENT ASSOCIATIONS AND ORE-PROSPECTING CRITERIA OF PYRITE TYPE COPPER-POLYMETALLIC DEPOSITS

The pyrite type copper polymetallic deposits are volcanics deposits related to submarine volcanic eruption sedimentary formation, and the mineralization occurs in marine intermediate acid spilite keratophyre sequence generally with relatively high content of trace elements. Host strata are dominated by Cu, Pb and Zn in association with Sb, Ba, Ag, As, Bi, Hg, Cd etc. These elements regionally form large areas of geochemical anomalies, whose main bodies correspond to orefields. Large scale rock geochemical survey in the ore district shows that distinct primary anomalies of these indicator elements are alternately in conformity with the mineralization enrichment positions of the ore deposit, showing indistinct horizontal zoning and obvious vertical zoning. Elements of different indicating significance are concentrated in different positions of mineralization, exhibiting zonation. Such zonation is an important geochemical parameter for evaluating denudation extent of mineralization and ore hunting prospects.