金川铜镍硫化物矿床中特富矿对比研究及成因探讨

Distribution of Massive Ore in Jinchuan Cu-Ni Deposit and Discussion of its Genesis

致密块状特富矿由于其显著的经济价值，越来越受到高度重视。首次通过地质模型来直观了解金川块状致密特富矿的空间分布；根据其与含矿超基性岩的空间关系，划分为岩体内部型和岩体边部型。通过对块状致密特富矿石及其附近细脉浸染状矿石的矿物成分测试，结果表明：块状矿石由约98％以上的金属硫化物组成，金属矿物主要为磁黄铁矿、黄铁矿、黄铜矿、镍黄铁矿，其中镍黄铁矿较发育，没有方黄铜矿；矿石中的磁黄铁矿均为单斜晶系，说明特富矿晶出温度很低，约在100-320℃范围。通过对成矿物质来源、成矿期次、控矿因素、成矿标志等方面进行探讨，指出块状致密特富矿分布受构造控制，与细脉浸染状矿石、含矿化辉绿岩脉密切相关。首次提出断层发育且有细脉浸染状矿石或含矿化辉绿岩脉的产出部位是寻找致密块状特富矿石的重点区域。

Compact massive rich ore becomes more and more attention, because of its significant economic value. Through the geological model, the spatial distribution of massive rich orebody is firstly realized. Acoording to the spatial relation with bearing-ore ultrabasic rock, it is divided into the internal type and the type of rock＇ edge. The mineral composition of massive rich ore and its nearby veinlet ores are tested. The results showed that： the massive ores is made up of more than 98% metal sulfides, which are mainly pyrrhotite, pyrite, chalcopyrite, pentlandite. In the massive ores pentlandite is very developed, no cubanite. Pyrrhotites in its ore are monoclinic, which means that the crystallized temperature of massive rich ore is very low, approximately in the range of 100- 320℃. To discuss the source of ore-forming materials, metallogenic time, ore-controlling factors and mineralization mark, the conclusion is pointed out that the distribution of massive rich ore is controlled by structure. It is closely related to the veinlet ores and diabase dikes in which copper or nickel sulfides occur. Finally the article concludes the key area for prospecting compact massive rich ore is where faults is developed, veinlet ore or diabase dikes of bearing-ore.