论文摘要
Located in the south of Hami basin of Xinjiang, the Shaquanzi Cu-Ni sulfide deposit is one of important deposits in the Aqishan-Yamansu belt of eastern Tianshan. Based on main element and trace element and REE geochemistry, this paper deals with the geochemical anomaly zoning and establishion for anomaly structure and also discusses ore genesis of the deposit. The samples are taken from 3 boreholes including ZK0501, ZK0502 and ZK0503 on the section of exploration line No. 5 in Shaquanzi test area. The results are as follow.（1） Based on the anomaly distribution of elements, the Shaquanzi copper and nickel sulfide deposit developed a series of hydrothermal alteration after the magmatic stage, which is similar to that of typical hydrothermal deposits. The concentration distribution of elements on the rock mass is displayed, and the ore body is the center. The content of positive anomaly elements such as Ni, Cu, and Co gradually decreased outwards. From the center of the original anomaly concentration of each element, Cu, Ni, Co, S, Te, and Au are obvious as the basic characteristics of the elements under the ore in the ore-bearing rock mass, and Ag, Bi, and Se are near-ore indicator elements. As, Mo, and mineralizer elements Cl exhibit the characteristics of elements on or front of mineral body. With reference to the zonation calculation method of hydrothermal deposits, zonation index and variability index of these elements are calculated respectively, and the geochemical anomaly zonation sequence of shaquanzi Cu-Ni sulfide deposit is established as following:（As, Mo, Cl）-（Se, Ag, Bi）-（Te, Au, Co, S, Cu, Ni）.（2） The geochemical properties of Rb and K2O are similar, and the negative anomaly patterns are basically the same. From the center of the ore body to the sides, an order of magnitude gradient band appears in the content of the element Rb, and K2O also exhibits obvious distribution characteristics in multiples. The negative anomaly formed by Th and Tl are in agreement with the ore body, and also show significant concentration distribution. It is speculated that the reason for these negative anomalies may be due to the fact that the baseultrabasic rock body invades the formation and releases a large amount of heat energy during its cooling process. This heat energy activates the elements originally in the surrounding rock and causes them to deplete. That is, taking the orebody as the center, the content of positive anomaly elements such as Ni, Cu,and Co gradually decreased outwards, and the content of elements such as Rb, K2O, Th, and Tl that formed negative anomalies gradually increased, and the positive anomaly corresponds to the negative anomaly space position.（3） LA-ICPMS analyses show that magnetite contains low V, Cr and Ti, indicating that magnetite was derived from the hydrothermal process rather than from the magmatic differentiation. Besides, the pattern of REE partition of dense impregnated and massive ore sulfides is characterized
论文目录
文章来源
类型: 国际会议
作者: LI Jianjun
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,矿业工程
单位: Geological surveying and mapping institute in hebei province
分类号: P618.41;P618.63
DOI: 10.26914/c.cnkihy.2019.028529
页码: 442
总页数: 1
文件大小: 59k
下载量: 1