安徽铜陵焦冲金-硫矿床S、Pb同位素组成及其指示意义  

Sulfur, lead isotope composition characteristics of the Jiaochong Au-S ore deposit in Tongling area and their indication significance

作　　者：张志辉[1,2,3] 张达[1] 狄永军[1] 舒斌[2,3] 庞振山[2,3] 杜泽忠[1] 阙朝阳 马先平 薛建玲[2,3] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质调查局发展研究中心,北京100037 [3]国土资源部矿产勘查技术指导中心,北京100120 [4]铜陵紫金矿业有限公司,安徽铜陵244100

出　　处：《地质通报》2013年第10期1643-1652,共10页Geological Bulletin of China

基　　金：铜陵紫金矿业有限公司项目;中国地质调查局项目(编号:1212011220737)

摘　　要：安徽铜陵焦冲金硫矿床位于长江中下游铜陵矿集区内,矿(化)体主要赋存于二叠系下统栖霞组(P1q)中。在分析该矿床成矿地质条件的基础上,系统研究了矿石S、Pb同位素组成特征,探讨了矿床成矿物质来源。矿石硫化物的S同位素组成变化范围较窄,成矿热液δ34SΣS在4.0‰左右,反映其来源与岩浆硫密切相关。矿石Pb同位素组成变化范围较大,经同位素组成特征及特征参数法判断矿石Pb为异常Pb。通过Zartman铅构造坏境演化图解和Δγ-Δβ成因分类图解,确定矿床物质来源与岩浆作用密切相关,其源于上地壳物质与地幔的混合。通过成矿物质来源的研究,期望为铜陵地区寻找与花岗闪长斑岩有关的矿床提供帮助。The Jiaochong Au-S ore deposit is located in the Tongling ore concentration area along the middle-lower reaches of the Yangtze River. The ore body mainly occurs in the Lower Permian Qixia Formation. Based on an analysis of geological and ore- forming conditions, this paper systematically focuses on the composition characteristics of S, Pb isotopes in the sulfide ore minerals, and also discusses the sources of the ore-forming materials. Studies have shown that the composition of S isotope in sulfide ore minerals has a narrow variation range, and the δ34S∑s in the ore-forming hydrothermal system is about 4.0‰. It is inferred that the S was genetically closely related to the magmatic sulfur. The isotopic compositions of ore lead vary greatly and belong to anomalous lead. Finally, through the chart of Zartman＇s Pb evolutionary tectionic settings and △γ-△β diagram of genetic classification, the authors considerthat the ore-forming materials of the ore deposit were closely related to the magmatism and derived from the mixed sources of the upper continental crust and the mantle. The authors sincerely hope that these data can provide some help for the study of ore deposits related to granodiorite of the Tongling ore concenteation area.

关 键 词：S、Pb同位素组成 成矿物质来源 焦冲金-硫矿床 铜陵 

分 类 号：P597[天文地球—地球化学] P611[天文地球—地质学]