大兴安岭北段得耳布尔铅锌银矿床成矿流体特征与意义
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  • 英文篇名:Characteristics of Ore-Forming Fluids in the De'rbur Pb-Zn-Ag Deposit in the NW Great Hinggan Mountains and Its Significance
  • 作者:赵岩 ; 吕骏超 ; 张朋 ; 张德宝 ; 沈鑫 ; 毕中伟
  • 英文作者:ZHAO Yan;L Junchao;ZHANG Peng;ZHANG Debao;SHEN Xin;BI Zhongwei;Shenyang Institute of Geology and Mineral Resources,CGS;No.6 Institute of Geological Mineral Exploration of Inner Mongolia;
  • 关键词:流体包裹体 ; D-O同位素 ; 成矿流体特征 ; 得耳布尔铅锌银矿床 ; 额尔古纳地块
  • 英文关键词:fluid inclusions;;D-O isotopes;;ore-forming fluid features;;De'rbur Pb-Zn-Ag deposit;;E'rguna massif
  • 中文刊名:DZXE
  • 英文刊名:Acta Geologica Sinica
  • 机构:中国地质调查局沈阳地质调查中心;内蒙古第六地质矿产勘查开发院;
  • 出版日期:2018-01-15
  • 出版单位:地质学报
  • 年:2018
  • 期:v.92
  • 基金:国家自然科学基金项目(编号41502093);; 中国地质调查项目(编号DD20160346、121201007000150009)资助成果
  • 语种:中文;
  • 页:DZXE201801010
  • 页数:12
  • CN:01
  • ISSN:11-1951/P
  • 分类号:145-156
摘要
得耳布尔矿床是产于大兴安岭北段额尔古纳地块内的大型铅锌银矿床,本文通过对闪锌矿、石英进行流体包裹体均一温度、盐度、激光拉曼和氢氧同位素测试以研究其成矿流体特征与来源。结果显示主成矿期闪锌矿及团块状石英中流体包裹体均一温度范围为213~260℃,盐度为3.05%~9.6%NaCleq;成矿晚期脉状石英中流体包裹体均一温度介于175~210℃之间,盐度3.53%~7.15%NaCl_(eq)。红外激光拉曼结果显示包裹体气相成分主要为H_2O及CO_2,含极少量CH_4。石英氢、氧同位素测试结果显示主成矿期δD_水值为-153.8‰~-149‰,δ~(18)O_水值为-0.77‰~2.38‰;成矿晚期δD_水值为-154‰~-141.4‰,δ~(18)O_水值为-2.27‰~-0.47‰。矿床成矿流体为岩浆水与演化大气降水的混合。额尔古纳地块内铅锌银多金属矿床成矿流体特征较为接近,主要为中低温低盐度NaCl-H_2O-CO_2±CH_4成矿流体;流体来源一致,推测为演化的大气降水与岩浆水的混合。
        The De'rbur Pb-Zn-Ag deposit is a large-scale deposit of this kind to occur in the E'rguna massif in the northern section of the Great Hinggan Mountains.Homogenization temperature and salinity in sphlerite and quartz,Laser Raman spectroscopy analysis and D-O isotope characteristics of fluid inclusions were carried out to study the ore-forming fluid features and sources of the deposit.Homogenization temperature and salinity of fluid inclusions in sphlerite and crumbly quartz of the main mineralization stage are 213~260℃ and 3.05%~9.6%NaCl_(eq),respectively.While homogenization temperature and salinity of fluid inclusions in quartz veins in late mineralization stage are 175~210℃ and 3.53% ~7.15%NaCl_(eq),respectively.Laser Raman spectroscopy analysis results reveal that H_2O and CO_2 with minor CH_4 are the main gas components of the fluid inclusions.The result also indicates a NaCl-H_2O system with CO_2 oreforming fluid in the deposit.Hydrogen and oxygen isotope study yields δD_(H_2O) values of-153.8‰ ~-149‰ and δ~(18)O_(H_2O) values of -0.77‰ ~2.38‰ for the main mineralization stage,and δD_(H_2O) values of-141.4‰~-154‰ and δ~(18)O_(H_2O) ranges of -2.27‰~-0.47‰ for the late mineralization stage.The oreforming fluid of the deposit should be a mixture of magma water and evolutional meteoric water.Oreforming fluids of the Pb-Zn-Ag deposits in the E'rguna massif show similar origin,with characteristics of low to moderate temperature NaCl-H_2O-CO_2 ±CH_4 ore-forming fluid system,suggesting a mixture of magma water with evolutional meteoric water.
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