江西通江岭铜钨矿床特征及其找矿意义

Characteristics of Tongjiangling Copper-Tungsten Deposit in Jiangxi and Its Prospecting Significance

通江岭矿区钨铜矿体受花岗闪长斑岩与断裂F1的控制,总体走向NEE、倾向南东,呈似层状、透镜状产于花岗闪长斑岩与茅口组碳酸盐岩接触带,具有"上铜下铜钨"的矿化分带特征。铜钨矿床类型为斑岩-夕卡岩型,白钨矿颗粒细小,呈浸染状、细脉状产于夕卡岩与斑岩体中。通江岭矿区深部花岗闪长斑岩沿石炭系、奥陶系碳酸盐岩或五通面、奥陶—志留系所形成的"硅/钙界面"接触带侵位部位,具有寻找厚层状斑岩-夕卡岩型钨或钨铜矿体的潜力;而通江岭铜钨共生矿体新发现,对九瑞矿集区乃至长江中下游成矿带找矿有借鉴意义。

Tungsten-copper orebodies in Tongjiangling mining area are controlled by granodiorite porphyry and fracture F1.The orebody,generally tends towards NEE and dip to southeast occurred along the contact zone of granodiorite porphyry and carbonate rocks of Maokou Formation in layered and lenticular form and shows a mineralization zonation characteristic of"copper in the upper part while copper plus tungsten mineralization occur below".Copper-tungsten deposits are of porphyry-skarn type.Scheelite within the deposit is fine grained,disseminated and veined in both skarn and porphyry.In tongjiangling mining area,"silicon-calcium interface"contact zone between the deep granodiorite porphyry with either carboniferous,ordovician carbonate rock or wutong face and ordovician-silurian shows a great potential for prospecting thick-bedded porphyry-skarn tungsten or tungsten-copper ore bodies.The new discovery of Tongjiangling copper-tungsten symbiotic orebody is of great significance to the prospecting of Jiurui ore gathering area and even the metallogenic belt in the middle and lower Yangtze River.