安徽金寨汞洞冲、银水寺铅锌矿床稳定同位素研究

Study on stable isotope of Gongdongchong and Yinshuisi Pb-Zn deposits in Jinzhai,Anhui Province

文章研究了北淮阳构造带金寨汞洞冲、银水寺2个铅锌矿床H、O、S、Pb同位素特征,结果显示汞洞冲、银水寺铅锌矿的成矿流体特征和成矿物质来源虽然有相似,但是也有不同。H、O同位素特征显示2个矿床的成矿热液中水均以岩浆水为主,其次是大气降水,其中银水寺铅锌矿的成矿热液中有更多大气降水的成分;S同位素特征显示2个矿床成矿热液中的硫主要来自于幔源岩浆,在成矿过程中没有围岩硫或者仅有少量围岩硫的加入;Pb同位素特征显示2个矿床的矿石铅都来源于地幔、下地壳或它们的混合源,但却不是相同的来源。

In this paper,H,O,S,Pb isotopic compositions from Jinzhai Gongdongchong and Yinshuisi Pb-Zn deposits,which are located in Beihuaiyang Tectonic Belt,Anhui Province,are studied.The results show that the characteristics of ore-forming fluids and sources of the Gongdongchong and Yinshuisi Pb-Zn deposits are similar,but there are differences between them.H-O isotope characteristics show that both of the ore-forming hydrothermal fluids of the two deposits are dominated by magmatic water,followed by atmospheric precipitation,and the ore-forming hydrothermal fluids of the Yinshuisi Pb-Zn deposit have more precipitation components.S isotope characteristics show that the sulfur in the metallogenic hydrothermal systems of the two deposits is mainly derived from the mantle-derived magma,and there is no reclamation or only a small amount of wall rock of sulfur in the mineralization process.Pb isotope characteristics show that ore lead sources of the two deposits are derived from the mantle,lower crust or their mixing source,but not the same source.