新疆鄯善县路北铜镍矿床成矿元素分布特征及找矿意义

Prospecting Significance and Distribution Characteristics of Ore-forming Elements of Lubei Copper Nickel Deposits of Shanshan County,Xinjiang

对路北铜镍矿区主成矿元素、共伴生有益元素在矿体和矿石中的含量及变化特征进行分析研究。路北铜镍矿区Ni/Cu比值平均为1.73,介于东天山铜镍成矿带的中间值(1.11~2.20),与香山铜镍矿最接近。通过对不同品级矿石Ni/Cu比值分析,Pt,Se元素含量具显著差异,特富矿体中最富集(53.03×10^(-6)、33.6×10^(-6)),Pt,Ag,Se元素更趋向富集于晚期的矿浆中。采用电子探针对镍黄铁矿、黄铜矿、磁黄铁矿进行分析,镍黄铁矿中Co与Fe元素呈此消彼长的趋势,随着Fe含量减少,Co含量呈增加趋势,与黄山东铜镍矿一致。路北、黄山东、香山、图拉尔根、白石泉等铜镍矿区镍黄铁矿、黄铜矿、磁黄铁矿中S元素与标准式相比普遍偏高,表明主成矿期S元素充足,利于Ni,Cu等成矿元素从硅酸盐中析出与S结合成矿。通过对路北岩浆铜镍硫化物矿床矿体及矿石中有益元素的分析探讨,认为路北铜镍矿深部存在高纯度硫化物矿浆式铜镍矿体。

In this paper,the contents and characteristics of main ore-forming elements and associated beneficial elements of Lubei Copper nickel ores are analyzed.The average Ni/Cu ratio of Lubei copper nickel deposits was 1.73 which is near the copper nickel metallogenic belt of Eastern Tianshan,and almost reach Xiangshan copper nickel mine.Through the analysis of Ni/Cu ratio of different grades of ore,it shows that Pt,Ag and Se elements tend to be enriched in later ore pulp.Nickel,pyrite,chalcopyrite and pyrrhotite were analyzed by electron probe,Co and Fe elements appear to be in flux,just like Xiangshan deposit.S element of nickel pyrite,chalcopyrite and pyrrhotite of Lubei,Huang Shangdong,Xiang shan,Tulaergen,Baishiquan are much higher than the standard which indicated that the S element is abundant during the main metallogenic epoch,it is advantageous for Ni,Cu and other ore-forming elements to be precipitated from silicate and combined with S.Through analysis and discuss of useful elements in ore bodies and ores from Lubei magmatic copper nickel sulfide deposit,it is considered that there is a high purity sulfide ore pulp copper nickel orebody in the deep part of Lubei Cu Ni deposit.