甘肃金川铜镍硫化物矿床金属硫化物矿物学特征研究.doc

甘肃金川铜镍硫化物矿床金属硫化物矿物学特征研究 【中文摘要】金川铜镍硫化物矿床位于甘肃省金昌市,是我国最大的铜镍硫化物矿床之一。矿床由四个矿区组成,含有丰富的铜、镍,而且含有大量的铂族元素,金、银、钴等,而受到国内外地质学家和地质工作者的广泛关注。本论文在收集、整理了前人资料的基础上,结合对矿区岩矿石标本的镜下观察和电子探针的研究,对金川铜镍硫化物矿床的岩石学、矿床学、矿物学特征进行了系统研究,基于对金川铜镍硫化物矿床的矿体形态、产状、矿石类型、矿石结构构造、矿物成分的研究,特别是对各类金属矿物的矿物学特征和组合类型的系统分析和观察,取得如下主要成果1提出金川铜镍矿床成矿过程包括了堆晶期、结晶期、热液蚀变期和蚀变期四个成矿期次,并阐明了四个成矿期次各自的金属硫化物共生组合类型和特征。2金川矿床中硅酸盐矿物主要为橄榄石、辉石,少量斜长石和角闪石,金属硫化物为磁黄铁矿、镍黄铁矿、黄铜矿、黄铁矿、方黄铜矿、少量闪锌矿,此外还含有铬铁矿、磁铁矿。3金川矿床的形成,至少经过了两个重要时期,一是超基性岩浆侵位的成岩成矿期,表现为岩浆熔离结晶成矿,另一个是成矿之后的构造变质热液叠加改造期。4经过热液叠加改造的矿物与结晶期矿物成分产生一定的变化。微量元素As、Se、Ag、Te富集;Ni、Cu、Co元素含量各有变化。; 【Abstract】 Jinchuan copper-nickel sulphide deposit is in Jinchang city, Gansu Province. It is the largest copper-nickel sulphide deposit in China. Jinchuan deposit is ed by the four mining areas, it richs in copper, nickel, also contains a lot of platinum group elements, gold, silver, cobalt. Native and foreign geologists or geological workers pay extensive attention to it.This *** collects and collates the ination on the basis of predecessors. With the observation of the samples of rocks and minerals from the mining area, and study with the electronic probe, It researches rock, deposit and mineralogical characteristics of Jinchuan copper-nickel sulphide deposit by system, based on the analysis and observation of the ore body shape, ore types and structure, mineral composition of Jinchuan deposit, especially for the mineralogical characteristics and the association of various metal minerals. The main results are as follows1 Ore-ing process of Jinchuan nickel-copper deposit includs four periods cumulate period, crystallization phase, hydrothermal alteration stage and alteration, and expounds various mineral association and characteristics in four mineralization periods of the metal sulfides.2 Silicate mineral in Jinchuan deposit mainly are olivine, pyroxene, feldspar and a small number of hornblende, metal sulfides are pyrrhotite, pentlandite , chalcopyrite, pyrite, cubanite, a small amount of sphalerite, It also contains chromite, magnetite.3 The ation of the Jinchuan deposit at least has two important periods, the first is diagenesis mineralization period of ultra-magmatic intrusion, the perance is the crystallization of magma and liquation ore-ation, and the other is the tectonic metamorphism and hydrothermal superimposition reation period after the mineralization period.4 After hydrothermal hydrothermal superimposition reation period, the mineral composition has a certain change compared with the crystallization phase. Trace elements As, Se, Ag, Te, Cd enrich, Ni, Cu, Co changes differently.