贵州泥堡金矿成矿流体特征及其地质意义
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  • 英文篇名:Characteristics of Ore-forming Fluids and Its Geological Significance in the Nibao Gold Deposit,Guizhou
  • 作者:邵主助 ; 彭振安 ; 蔡明海 ; 张含 ; 胡志戍 ; 刘嘉兴
  • 英文作者:SHAO Zhu-zhu;PENG Zhen-an;CAI Ming-hai;ZHANG Han;HU Zhi-shu;LIU Jia-xing;College of Resources Environment and Materials,Guangxi University;
  • 关键词:流体包裹体 ; 成矿流体 ; 泥堡金矿 ; 断控型矿体
  • 英文关键词:fluid inclusion;;ore-forming fluid;;Nibao gold deposit;;fault-controlled type orebody
  • 中文刊名:KXJS
  • 英文刊名:Science Technology and Engineering
  • 机构:广西大学资源环境与材料学院;
  • 出版日期:2019-05-18
  • 出版单位:科学技术与工程
  • 年:2019
  • 期:v.19;No.483
  • 基金:广西大学科研基金(BXZ090946)资助
  • 语种:中文;
  • 页:KXJS201914007
  • 页数:11
  • CN:14
  • ISSN:11-4688/T
  • 分类号:51-61
摘要
为了查明泥堡金矿成矿流体特征及成矿机制,对断控型矿体主成矿阶段开展流体包裹体显微测温工作。研究结果表明,断控型矿体主成矿阶段流体包裹体类型有Na Cl-H_2O型、CO_2-Na Cl-H_2O型,其均一温度为90~315.6℃,主要集中在120~180℃,其中中温主要集中在200~240℃,盐度为0.35%~12.85%,主要集中在1%~7%,密度为0.803~1.030 g/cm~3。通过软件计算得出断控型矿体成矿流体压力为26.4~64.2 MPa,平均为42.3 MPa,换算成矿深度为1.0~2.43 km,平均为1.6 km。热力学参数计算表明其成矿流体的酸碱度为5.5~6.2,氧化还原电位为0.084~0.324 V,氧逸度(lgf_(O2))主要集中于-45.07~-37.64。成矿流体总体表现为中低温、低盐度、低密度、弱酸性、相对氧化及低氧逸度的特征,并含不同程度的CO_2及少量的CH_4、CO、H_2S等气体。断控型矿体中CO_2-Na Cl-H_2O热液体系的减压沸腾可能是引起矿质沉淀的重要因素,断控型矿体和层控型矿体成矿流体可能主要来源于深源岩浆水,流体运移过程中有大气降水和少量的变质水的加入,成矿可能与深部隐伏岩体的岩浆活动有关。
        In order to reveal the characteristics of the ore-forming fluid and the metallogenic mechanism of the Nibao gold deposit,the microscopic temperature measurement of fluid inclusions of the main metallogenic stage of the fault-controlled type orebody was carried out.The results show that NaCl-H_2O type inclusions and CO_2-NaClH_2O type inclusions with homogenization temperatures ranging from 90℃to 315.6℃,salinities is from 0.35%to12.85%Na Cl_(eq),and densities is from 0.803 to 1.030 g/cm~3 are found in quartz and calcite of the main metallogenic stage in fault-controlled type orebody.The pressure of ore-forming fluid of the fault-controlled type orebody is from 26.4 to 64.2 MPa,the mineralization depth is from 1.0 to 2.43 km,the degree of acid and alkaline ranging from 5.5 to 6.2,oxidation-reduction potential ranges from 0.084 to 0.324 V and oxygen fugacity(lgf_(O2))mainly ranging from-45.07 to-37.64.All the results suggest the ore-forming fluid is characterized by low or medium temperature,low salinity,low density,weak acid,relative oxidation and low oxygen fugacity,and contains different degrees of CO_2 and a small amount of CH_4,CO,H_2S and other gases.The mineralization of the fault-controlled type orebody may be caused by the decompression boiling of CO_2-NaCl-H_2O hydrothermal system.Compositions of hydrogen and oxygen isotopes indicate that ore-forming fluid of two types orebody is mainly derived from deep magmatic water as well as possible addition of meteoric water and a small amount of metamorphic water in the process of fluid migration.The mineralization may be related to the magmatic activity of the deep concealed rock body.
引文
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