水口山铅锌矿成因探讨

南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (6): 732–.

水口山铅锌矿成因探讨

路睿，徐兆文，陆建军，左昌虎，赵增霞，缪柏虎

出版日期:2014-01-14 发布日期:2014-01-14
作者简介:(内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京,210093)
基金资助:
国家重点基础研究发展计划项目(2012CB416705),中国地质调查局调查项目(1212011085407)

GENESIS OF THE SHUIKOUSHAN LEAD-ZINC DEPOSIT, CHANG-NING CITY, HUNAN PROVINCE

Lu Rui，Xu Zhao-wen，Lu Jian-jun，Zuo Chang-hu，Zhao Zeng-xia，Miao Bo-hu

Online:2014-01-14 Published:2014-01-14
About author: (State Key Laboratory for Mineral Deposits ResearchSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210093China)

摘要/Abstract

摘要： 本文在野外地质工作基础上，运用流体地球化学和同位素地球化学方法，通过流体包裹体和SPb、C-O同位素研究，探讨水口山铅锌矿床物理化学条件和物质来源。均一温度介于92℃～345℃之间，盐度介于0.35%～19.84% NaCl eq.之间流体密度0.668 g/cm3～1.083g/cm3，均为0.929g/cm3估算压力约18.3MPa，推测成矿深度约1.8km。矿石δ34S介于-2.42‰～-0.23‰之间，均值为-1.10‰，说明矿石中的硫主要来源于岩浆，并受到地壳物质混染。矿石206Pb/204Pb介于18.444～18.538之间，均值为18.150；207Pb/204Pb介于15.654～15.783之间，均值为15.726； 208Pb/204Pb介于38.627～39.066之间，均值为38.872，表明矿石中的铅主要来源于地壳。地层中灰岩δ13CVPDB介于-0.5‰～0.3‰之间，均值为0‰，δ18OSMOW介于14.1‰～16.8‰之间，均值为 15.5‰；含矿方解石δ13CVPDB介于-1.8‰～-0.7‰之间，均值为-1.3‰，δ18OSMOW介于15.0 ‰～16.5 ‰之间，均值为16.0‰。矿石碳、氧同位素与地层灰岩中碳、氧同位素值大致相近，表明矿石中碳主要来源于上古生代的灰岩。流体包裹体研究和同位素示踪，并参照前人研究成果，水口山铅锌矿床形成于浅成低温环境，成矿物质主要来源于地壳。

Abstract: Based on field geological investigation, comprehensive study of fluid inclusions and C-O isotopes for ore-bearing calcites, and S-Pb isotopes for ore sulfide are conducted, this paper discussed the ore-forming physicochemical conditions, the metallogenic material source, and genesis of the Shuikoushan lead-zinc deposits. Homogenization temperatures of fluid inclusions range from 92℃to 345℃ in ore-bearing calcites , with the salinities ranging from 0.35% to 19.84% NaCl eq.. The density of fluid inclusions ranges from 0.668 g/cm3 to 1.083 g/cm3 , with an average value of 0.929g/cm3. δ34S values of ore range from -2.42 ‰ to -0.23 ‰ , with an average value of -1.10‰ , indicating a deep source for magma and maybe partly contaminated by the crustal substance. Ore 206Pb/204Pb values range from 18.444 to 18.538, with a mean value of 18.150 ; 207Pb/204Pb values range from 15.654 to 15.783, with a mean value of 15.726 ; 208Pb/204Pb values range from 38.627 to 39.066 , with a mean value of 38.872, indicating a mainly upper crust source. Value of δ13 C VPDB of limestone in stratum values range from -0.5 ‰ to 0.3 ‰ , with an average value of 0 ‰ , δ18 O SMOW values range from 14.1 ‰ to 16.8 ‰ , with an average value of 15.5 ‰ ; δ13 C VPDB of ore-bearing calcites values range from -1.8 ‰ to -0.7 ‰ , with an average value of -1.3 ‰ , δ18 O SMOW values range from 15.0 ‰ to 16.5 ‰ , with an average value of 16.0‰ ; The similar C-O isotopic compositions of ore-bearing calcites and the limestone in Early Paleozoic stratum infers their affinity in source. According to the above data of fluid inclusions and the stable isotope , we can conclude that the mineral sources of the Shuikoushan lead-zinc deposits predominantly derived from the earth crust, and the deposits was formed in a low temperature epithermal environment

路睿，徐兆文，陆建军，左昌虎，赵增霞，缪柏虎. 水口山铅锌矿成因探讨[J]. 南京大学学报(自然科学版), 2013, 49(6): 732–.

Lu Rui，Xu Zhao-wen，Lu Jian-jun，Zuo Chang-hu，Zhao Zeng-xia，Miao Bo-hu . GENESIS OF THE SHUIKOUSHAN LEAD-ZINC DEPOSIT, CHANG-NING CITY, HUNAN PROVINCE[J]. Journal of Nanjing University(Natural Sciences), 2013, 49(6): 732–.

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