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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 Tongchong gold-sulfur deposit in Tongling, Anhui Province is located in the Tongling ore-gathering area in the middle and lower reaches of the Yangtze River. The ore-forming body mainly occurs in the Lower Permian Qixia Formation (P1q). Based on the analysis of the metallogenetic geological conditions of this deposit, the characteristics of S and Pb isotopic composition of ore are systematically studied, and the sources of ore-forming materials are discussed. The S isotopic composition of sulfide ores shows a narrow range of variation, and the δ34SΣS of ore-forming hydrothermal fluids is about 4.0 ‰, which indicates that the source of S-isotopic composition is closely related to magmatic sulfur. The ore Pb isotopic compositions have a wide range of variation, and the ore Pb is determined to be abnormal Pb by the characteristics of isotopic compositions and characteristic parameters. Based on the Zartman lead tectonic evolution diagram and Δγ-Δβ genetic classification diagram, it is confirmed that the material source of the deposit is closely related to the magmatism, which is derived from the mixing of the upper crust material and the mantle. Based on the study of the origin of metallogenic materials, it is hoped that it may be helpful to find the deposits related to granodiorite porphyry in Tongling area.