江西省九瑞矿集区宝山铜多金属矿床地质特征及其成因探讨

经过对宝山铜多金属矿床的野外地质调查,认为该矿床主要由斑岩型铜钼(银)矿体、矽卡岩型铜、钼(银)矿体、角岩化变质粉砂岩内热液充填型铜金(钼、银)矿体组成.与成矿密切相关的构造为北东向F1断裂和北西向F2断裂.斑岩型铜多金属矿体呈细脉状、稀疏浸染状-稠密浸染状产出于花岗闪长斑岩中,矿体形态似层状、透镜状.矽卡岩型铜多金属矿体以浸染状和细脉-网脉状分布于花岗闪长斑岩与奥陶系碳酸盐岩接触带及其围岩裂隙中,呈似层状、透镜状产出.角岩化泥质粉砂岩中热液充填型铜多金属矿体,规模较小,均以细脉-网脉状黄铜矿、辉钼矿石英脉的形式分布于与花岗闪长斑岩接触带附近的志留系殿背组、清水组泥质粉砂岩中,呈透镜状产出.三类矿体在成因上存在联系,成矿作用主要受控于花岗闪长斑岩,只是成矿物质沉淀的空间位置存在区别.宝山矿床为与高钾钙碱性重熔型花岗闪长斑岩成因密切联系的构造-岩浆岩"三位一体"的成矿机制,即矿体赋存于斑岩、矽卡岩、角岩化泥质粉砂岩中所形成的"斑岩-矽卡岩-热液充填"复合型矿床.

Discussion on the Geological Characteristics of Baoshan Cu Polymetallic Deposit and Its Genesis in Jiujiang-Ruichang Ore Concentration Area,Jiangxi Province

Baoshan copper polymetallic deposit is located in the town of Ruichang City, Jiangxi Province,Xia fan is the first as large or medium-sized copper polymetallic deposit newly found in Baoshan-Jiujiang Ruichang ore metallogenic belt in the middle and lower reaches of Yangtze River Bridge in areas dorsal nucleus of department. Mainly by the porphyry copper(silver) deposit, contact skarn type copper, molybdenum (silver) deposit, hornfels andmetamorphic siltstone hydrothermal filling type copper (molybdenum, silver and gold) ore bodies. The miner-alization is closely related with the North East to the F1 fault and the NW trending F2 fault. The Baoshan deposit of porphyry copper ore bodies are veinletdisseminated-dense, sparse contaminated products out of granodiorite porphyry, orebody shape stratoid, lenticular. Skarn type copper polymetallic ore with disseminated and veinlet-net vein in the granodiorite porphyry and the Ordovician carbonate rocks in the contact zone and fractured sur-rounding rock, stratoid, lenticular output. Hornfels and hydrothermal fillingsilty sandstone copper polymetallic ore, ore body in the smaller scale, with thin vein stockworkchalcopyrite, molybdenite quartz veins in the form of distribution to and granodiorite porphyrycontact zone near the temple back group, water group of Silurian argilla-ceous siltstone, alens occurrence. Three types of ore bodies are associated in genesis, the mineralization is mainly controlled by the granodiorite porphyry, is just the space position of ore-forming material precipitation difference. The Baoshan deposit metallogenic mechanism of tectonicand high potassium calc alkaline remelting type granodi-orite porphyry origin closely relatedmagmatic rocks"Trinity", that is, the ore bodies are hosted in the porphyry and skarnhornfels formed rocks, argillaceous siltstone in the porphyry skarn hydrothermal filling"composite type deposit.