柞山盆地窑火沟铜矿地质特征及成因分析

Analysis on the geologic characteristics of Yaohuogou bedded skarn copper deposit in Zhashan basin and its formation causes

对位于柞山盆地中南部、小河口-园子街铁铜金成矿带中段的代表性矿床——窑火沟铜矿床的矿床地质特征和控矿因素进行了重新分析和研究,发现窑火沟铜矿矿体呈似层状和透镜状,产于下石炭统二峪河组第三岩性段(C_1r^5)、第五岩性段(C_1r^5)的层间裂隙中.赋矿围岩为绿帘石石榴石矽卡岩、透辉石石榴石矽卡岩,矿石金属矿物主要有黄铜矿、斑铜矿、磁铁矿、黄铁矿、雌黄铁矿等,脉石矿物主要有柘榴石、透辉石、方解石等.层间裂隙控制矽卡岩带和矿体分布,同一成矿带上小河口铜矿金属硫化物S同位素、方解石氧同位素、Pb同位素、流体包裹体显示成矿流体H-O同位素组成分析结果均显示热液中的水属于岩浆水,因而认为窑火沟铜矿床属于层控矽卡岩型矿床.该矿床的成因模式对在柞山盆地中寻找类似矿床具有指导意义.

This paper re - analyzes the geological features and ore - controlling factors of Yaohuogou copper mine on the basis of studying on the representative deposit continuously, which is located at the central - southern part of Zhashan Basin, and the middle of Xiaohekou - yuanzijie Fe - Cu - Au metallogenic belt. It is found out that the ore body is near- bedded and lenticular shaped, occurred in the interlayer fissure between the third rock section （Clr^3 ） and fifth rock section （Cl r^5） in the Eryuhe Formation of Carboniferous System. The host surrounding rock belongs to the epidote garnet skam, and the diopside garnet skarn. The metallic minerals of ore mainly include chalcopyrite, bornite, magnetite, pyrite, pyrrhotite, etc. The gangue minerals mainly consist of garnet, diopside, calcite, and so on. The ore body and skam ore belt are controlled by interlayer fissures, because the analysis result of S, O, Pb isotope and fluid inclusion, H -O isotope in the ore -forming fluid shows the water in hydrothermal fluid comes from magmatic water in the same mineralization beltl It is considered that the deposit is the bedded skam deposit. The formation model of the deposit has great guiding significance in searching for this kind deposit in the Zhashan Basin.