福建上杭紫金山高硫化型铜矿床矿化分带特征

The Characters of Mineralize Zone of Zijinshan High-Sulfur Copper Deposit

通过矿相学,系统分析铜硫化物以及脉石矿物的结构构造、形态特征以及嵌布特征,主要铜硫化物为铜蓝、斜方蓝辉铜矿;通过电子探针,分析铜硫化物各种元素含量,尤其是主量元素Cu/S比值垂向变化规律在钻孔浅部无明显规律,随着深度增加Cu/S比值逐渐减小,最后趋近于一个常数约为1.3。铜矿成矿影响因素:(1)火山机构的温度影响范围有限,并未改变铜硫化物的矿物组合特征,只是影响铜硫化物Cu/S比值分配,表现为越远离火山机构Cu/S比值越高;(2)高氧逸度条件是形成稳定铜硫化物的重要条件。氧逸度垂向由上至下先是具有高氧逸度,随着深度增加氧逸度逐渐减小,最后增加为高氧逸度。Cu/S比值变化规律为今后紫金山铜矿深部找矿提供重要的矿化信息。

By means of optical microscope, systems analysis the texture and structure, morpho- logical characteristics anf features of disseminated of copper sulfides and gangue minerals. The main copper sulfides is covellite and anilite. By electron probe, analysis of the copper sulfides content of various elements, especially the major elements of Cu / S ratio of vertical variation is that drilling shallow is no obvious rule, and with the depth increasing , Cu / S ratio decreases gradually, and finally closes to 1.3. Copper mineralization have two factors： one is that limited impact on the volcanic edifice temperature did not change the copper sul- fides mineral assemblage, and affects only the copper sulfides Cu / S ratio distribution, showing more away from the volcanic edifice of Cu / S ratio the higher; the other is The high oxygen fugacity is an important condition for stable copper sulfides. The oxygen fugacity of the vertical from top to bottom first high oxygen fugacity, and gradually decreases with increasing depth, the last increase of high oxygen fugacity. Cu / S ratio variation provides important information on the mineralization for deep prospecting of Zijinshan copper ore in the future.