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现代地质 ›› 2012, Vol. 26 ›› Issue (3): 464-470.

• 矿床学与构造学 • 上一篇    下一篇

河南内乡北部铅锌银矿床成矿物质来源的S、Pb同位素制约

 向世红1,2, 曹纪虎1, 薛春纪1, 张旭2, 李永峰2, 李丙奇2, 王新宇1   

  1. 1 地质过程与矿产资源国家重点实验室,中国地质大学 地球科学与资源学院,北京100083;2 河南省有色金属地质矿产局,河南 郑州450016
  • 收稿日期:2012-02-11 修回日期:2012-03-19 出版日期:2012-06-07 发布日期:2012-06-14
  • 通讯作者: 薛春纪,男,教授,博士生导师,1962年出生,矿产普查与勘探专业,主要从事矿床学研究。Email:chunjixue@cugb.edu.cn。
  • 作者简介:向世红,男,博士研究生,1969年出生,矿产普查与勘探专业,主要从事矿产勘查工作。Email:xiangshihong@163.com。
  • 基金资助:

    地质过程与矿产资源国家重点实验室科学基金项目(GPMR0936);河南省科技发展计划项目(2010-021);河南省有色金属地质矿产局科技创新项目(ysdk2010-6)。

S and Pb Isotopic Constraints on the Ore forming Material Sources ofthe Pb-Zn-Ag Ore Deposit in Northern Neixiang, Henan Province

 XIANG  Shi-Gong-1,2, CAO  Ji-Hu-1, XUE  Chun-Ji-1, ZHANG  Xu-2, LI  Yong-Feng-2, LI  Bing-Ai-2, WANG  Xin-Yu-1   

  1. 1 State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;2 Bureau of Non ferrous Metals Geological and Mineral Resources,  Zhengzhou, Henan450016, China
  • Received:2012-02-11 Revised:2012-03-19 Online:2012-06-07 Published:2012-06-14

摘要:

河南省内乡县北部大型铅锌银矿床产于北秦岭造山带朱夏断裂北侧的二郎坪地体内,形成于晚元古代—早古生代弧后盆地环境的(变质)火山-沉积建造。矿区已发现铅锌银矿(化)脉近百条,矿脉多呈板状、脉状充填于近垂直造山带的断裂构造中,其中以较大规模的Y1、Y3、Y6、Y10和Z2号脉为代表。在矿床地质研究的基础上,选取Y1、Y3、Y6和Z2号矿脉中闪锌矿矿石和Y10号矿脉中方铅矿矿石进行了S同位素组成分析,δ34SV-CDT范围为1.89‰~7.34‰,指示硫主要来源于赋矿的古生界海相地层中硫酸盐的热化学还原;矿石中方铅矿的Pb同位素组成206Pb/204Pb范围为18.229 4~18.384 5, 207Pb/204Pb范围为15.608 9~15.643 4, 208Pb/204Pb范围为38.516 0~38.715 2,矿石铅μ值范围为9.50~9.55,ω值范围为37.45~38.35,指示成矿金属物质来源于赋矿的古生界变质火山-沉积地层。研究表明内乡北部铅锌银矿区的成矿物质可能来自秦岭群和二郎坪地层。

关键词: S、Pb同位素, 铅锌银矿床, 成矿物质来源, 内乡北部, 河南

Abstract:

The large scale Pb-Zn-Ag deposit in the northern Neixiang County in Henan Province is found in the Erlangping Terrain which is on the north side of Zhu Xia fault in North Qinling orogenic belt, which formed in deterioration volcano sediment of the back arc environment during the Late Proterozoic Early Paleozoic.Nearly 100 mineral veins have been found, most of which are filled in fault structure of vertical orogenic belt and present layered and bedded single veins, in which the large scale Y1, Y3, Y6, Y10 and Z2 are typical. We select the sphalerite mineral of Y1, Y3, Y6, and Z2 together with galena mineral of Y10 to test S isotope, and δ34SV CDT  ranges from 1.89‰ to 7.34‰, which indicating that sulfur is mainly from the thermo chemical sulfate reduction of Paleozoic marine host strata; Pb isotope from galena shows that 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb are 18.229,4-18.384,5, 15.608,9-15.643,4 and 38.516,0-38.715,2, respectively, μ value is between 9.50 and 9.55,and ω value is between 37.45 and 38.35, all above shows that metal ore sources from Paleozoic metamorphic volcano sedimentary host strata.Studies show that the ore sources of Pb-Zn-Ag deposit in the northern Neixiang County, may come from the Qinling Group and Erlangping Terrain.

Key words: S and Pb isotope, PbZnAg deposit, oreforming material source, northern Neixiang, Henan Province