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大兴安岭北段斑岩型钼(铜)矿床主要硫化物化学成分特征及地质意义——以770钼(铜)矿床为例

  • 孙永刚|靳皇玉|王永胜|张徐平|王成昆|李焕纪
  • 作者单位:
  • 宿州学院资源与土木工程学院|吉林省地质调查院|吉林省地质调查院|黑龙江省第十一地质勘查院|宿州学院资源与土木工程学院|宿州学院资源与土木工程学院
  • 基金项目:

  • 2024年度安徽省教育厅高校自然科学重点科研项目(2024AH051826);宿州学院2022年博士科研启动基金项目(2022BSK009);宿州学院2023年博士后科研启动基金项目(2023BSH001);中国矿产地质志项目(DD20221695,DD20190379,DD20160346)
  • 详细信息:

  • 作者简介:
  • 孙永刚(1988—),男,讲师,博士,研究方向为热液矿床成矿理论与预测;E-mail:xg429805791@163.com
  • 通讯作者:
  • 靳皇玉(1982—),男,高级工程师,硕士,从事地质矿产勘查及研究工作;E-mail:44548610@qq.com
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Chemical characteristics of major sulfides in porphyry-type molybdenum (copper) deposits in the Northern Greater Khingan Mountains and their geological significance—A case study of 770 Molybdenum (Copper) Deposit

  • English Author:
  • School of Resources and Civil Engineering,Suzhou University|Geological Survey Institute of Jilin Province|Geological Survey Institute of Jilin Province|The Eleventh Geological Survey Institute of Heilongjiang Province|School of Resources and Civil Engineering,Suzhou University|School of Resources and Civil Engineering,Suzhou University
  • Unit:
  • 摘要
  • 在线预览
  • 参考文献

摘要:

斑岩型钼(铜)矿床一直以来都是地质学领域的研究热点。770钼(铜)矿床是近年来在大兴安岭北段新发现的斑岩型钼(铜)矿床,目前对于该矿床的报道较少。以大兴安岭北段770钼(铜)矿床中黄铁矿和黄铜矿为研究对象,利用电子显微镜和电子探针分析技术(EPMA),深入探讨黄铁矿和黄铜矿的晶体形态和主量元素、微量元素组成,以便更全面地解析黄铁矿和黄铜矿的化学成分特征及其地质意义。770钼(铜)矿床为大型斑岩型钼(铜)矿床,矿体赋存于晚侏罗世的花岗斑岩中。从中心向外部,蚀变区域可分为钾化带和黄铁-绢英岩化带。电子探针分析结果显示,黄铁矿中w(S)普遍小于53.45 %,w(Fe)普遍小于46.55 %,w(S)/w(Fe)≥1.148,表明770钼(铜)矿床黄铁矿主要为贫铁贫硫型黄铁矿,成矿环境的硫逸度较高。黄铁矿微量元素与主量元素的正负相关性特征表明,黄铁矿中的微量元素如Zn、Mo、Ni、Co和As,通常以矿物包裹体或类质同象的形式存在于矿物中。770钼(铜)矿床中黄铁矿w(Co)/w(Ni)值(2.25~4.50)显示,其具有岩浆热液成因的性质。黄铜矿的[n(Cu)+ n(Fe)]/n(S)值(平均值为0.91)表明,黄铜矿等金属硫化物的形成可能发生在中低温(约200 ℃)热液环境中。

关键词:

大兴安岭北段;斑岩型;770钼(铜)矿床;黄铁矿;黄铜矿;微量元素;岩浆热液

Abstract:

Porphyry-type molybdenum (copper) deposits have long been a focus of geological studies.770 Molybdenum(Copper) Deposit,a newly discovered porphyry-type deposit in the Northern Greater Khingan Mountains,has seen limited reporting.This study examines pyrite and chalcopyrite within 770 Molybdenum (Copper) Deposit using electron microscopy and EPMA(Electron Probe Micro-analysis) to investigate the crystal morphology and the major and trace element compositions of these sulfides,providing a comprehensive understanding of their chemical characteristics and geological significance.The 770 Molybdenum (Copper) Deposit,a large porphyry-type molybdenum (copper) deposit,has its ore bodies hosted in Late Jurassic granite porphyry.Alteration zones are pided into a central potassic zone and a peripheral pyrite-sericite zone.EPMA results show pyrite with sulfur content generally below 53.45 %,iron content below 46.55 %,and a w(S)/w(Fe) ratio≥1.148,indicating that the deposit-s pyrite is low-iron,low-sulfur pyrite,formed under conditions of high sulfur fugacity.The trace-to-major element correlations suggest elements like Zn,Mo,Ni,Co,and As exist in pyrite as mineral inclusions.The w(Co)/w(Ni) ratio(2.25-4.50) in pyrite indicates a magmatic-hydrothermal origin,while the [n(Cu)+n(Fe)]/n(S) ratio in chalcopyrite(average 0.91) suggests formation in a mid to low-temperature(around 200 ℃) hydrothermal environment.

Keywords:

Northern Greater Khingan Mountains;porphyry-type;770 Molybdenum (Copper) Deposit;pyrite;chalcopyrite;trace elements;magmatic hydrothermal