南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (4): 567–.

• •    下一篇

河南省新县姚冲钼矿床成因机制研究

展恩鹏1，李红超2，徐兆文1*，赵增霞1，邱文洪1，陈　伟1   

  • 出版日期:2016-07-23 发布日期:2016-07-23
  • 作者简介:1.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，南京，210023 ；2．河南省有色金属地质勘查总院，郑州，450052
  • 基金资助:
    基金项目：国家自然科学基金(40973030，41173050) 收稿日期：2016－05－28 *通讯联系人，E­mail：xzwen@nju.edu.cn

Study of formation mechanism from the Yaochong Mo deposit，Xinxian Country，Henan Province

Zhan Enpeng1，Li Hongchao2，Xu Zhaowen1*，Zhao Zengxia1，Qiu Wenhong1，Chen Wei1   

  • Online:2016-07-23 Published:2016-07-23
  • About author: 1.State Key Laboratory for Mineral Deposit，School of Earth Science and Engineering，Nanjing University，Nanjing，210023，China；2．Henan Province Bureau of Nonferrous Metals Geology and Mineral Resources，Zhengzhou，450016，China

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摘要： 在详细的野外地质工作基础上，通过含矿石英中的流体包裹体，矿石硫、铅同位素，含矿石英氢、氧同位素等研究，探讨姚冲钼矿床成矿物质来源和形成机制．显微观察表明流体包裹体可分为LH2O＋VH2O两相水溶液包裹体(Ⅰ型)、LH2O＋LCO2＋VCO2三相水溶液包裹体(Ⅱ型)和含子矿物的LH2O＋LCO2＋VCO2＋S四相水溶液包裹体(Ⅲ型)三种类型；流体包裹体均一温度介于190 ℃～384 ℃(含子晶介于322 ℃～513 ℃)之间，盐度介于1.62 wt%～13.18 wt% NaCl eq之间；流体包裹体激光拉曼组分分析显示：Ⅰ型包裹体主要为H2O并含有少量CO2，Ⅱ型和Ⅲ型包裹体主要为H2O和CO2；计算密度介于0.641～0.965 g·cm－3之间，估算最大成矿深度约2 km.矿石硫同位素δ34SV－CDT值介于－2.89‰～－0.30‰之间，均值为－1.78‰.矿石铅同位素206Pb/204Pb比值介于16.363～17.344之间，均值为16.757；207Pb/204Pb比值介于15.298～15.473之间，均值为15.368；208Pb/204Pb比值介于37.324～37.854之间，均值为37.539.含矿石英的δDSMOW值介于－79.80‰～－64.30‰之间，均值－70.20‰；δ18OH2O值介于1.24‰～3.08‰之间，均值2.07‰.以上研究表明姚冲钼矿床形成于中高温浅成环境，成矿物质主要来源于下地壳溶融形成的岩浆，可能混有少量的地幔物质；成矿流体以岩浆水为主，混有大气降水，混合作用是矿床形成的主要机制．

Abstract: Based on field geological investigation，we studied microthermometry and Micro­laser Raman microprobe compositions for fluid inclusions from the Yaochong Mo deposit，as well as sulfur and lead isotopic compositions for ores，hydrogen and oxygen isotopic compositions for ore­bearing quartz.This paper discusses that the ore­forming materials resource and formation mechanism for the Yaochong Mo deposit.The microscopic observation shows that fluid inclusions are mainly consists of LH2O＋VH2O fluid inclusions(type Ⅰ)，LH2O＋LCO2＋VCO2 fluid inclusions(type Ⅱ)and LH2O＋LCO2＋VCO2＋S fluid inclusions(type Ⅲ)．Microthermometry indicates that the homogenization temperatures range from 190 ℃ to 384 ℃(daughter minerals­braring fluid inclusions range from 322 ℃ to 513 ℃)and their salinities range from 1.62 to 13.18 wt% NaCl eq.Micro­laser Raman spectroscopy shows that the type Ⅰ fluid inclusions mainly consist H2O and a small amount of CO2，type Ⅱ and type Ⅲ mainly contain H2O and CO2.We conclude that fluid density varies from 0.641 to 0.965 g·cm－3，and ore­forming depth is about 2 km.The δ34SV－CDT value of ores ranges from －2.89‰ to －0.30‰，with an average value of －1.78‰.206Pb/204Pb，207Pb/204Pb and 208Pb/204Pb ratios of ores range from 16.363 to 17.344，15.298 to 15.473 and 37.324 to 37.854，with the average value of 16.757，15.368 and 37.539，respectively.The δDSMOW and δ18OH2O values of the ore­bearing quartz are －79.80‰～－64.30‰(with an average value －70.20‰)，1.24‰～3.08‰(with an average value 2.07‰)，respectively.The synthetic analytical results indicate that the Yaochong Mo deposit is formed in superficial and middle­high temperature environment，ore­forming materials mainly came from the melting crust and may be contaminated by mantle substances.The ore­forming fluid mainly came from magmatic water and then was contaminated by meteoric water，which means the mixing effect is the main mechanism of ore deposit formation.

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