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内蒙古好力宝斑岩型铜钼矿床流体特征和矿床成因

  • 作者:
  • 曲高勇|付丽娟|黄广环|王可勇|孙清飞|崔志磊
  • 作者单位:
  • 吉林大学地球科学学院|内蒙古山金地质矿产勘查有限公司|内蒙古山金地质矿产勘查有限公司|吉林大学地球科学学院&新疆大学地质与采矿工程学院&国土资源部东北亚矿产资源评价重点实验室|吉林大学地球科学学院|内蒙古山金地质矿产勘查有限公司
  • 基金项目:

  • 山东黄金集团有限公司科技项目(SD2018-6)
  • 详细信息:

  • 作者简介:
  • 曲高勇(1994—),男,河南周口人,硕士研究生,研究方向为矿床学;长春市建设街2199号,吉林大学地球科学学院,130061;E-mail:qugaoyong6@163.com
  • 通讯作者:
  • E-mail:wangky@jlu.edu.cn,13069004095
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Ore-forming fluids characteristics and deposit genesis of Haolibao Porphyry Cu-Mo Deposit,Inner Mongolia

  • English Author:
  • College of Earth Sciences,Jilin University|Inner Mongolia Shandong Gold Geological Minerals Survey Co.,Ltd.|Inner Mongolia Shandong Gold Geological Minerals Survey Co.,Ltd.|College of Earth Sciences,Jilin University&College of Geology and Mining Engineering,Xinjiang University&MNR Key Laboratory of Mineral Resources Evaluation in Northeast Asia|College of Earth Sciences,Jilin University|Inner Mongolia Shandong Gold Geological Minerals Survey Co.,Ltd.
  • Unit:
  • 摘要
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  • 参考文献

摘要:

好力宝矿床位于西拉木伦成矿带东部,为斑岩型铜钼矿床。矿体主要赋存于斜长花岗斑岩的角砾岩带中,与斜长花岗斑岩关系密切,成矿作用划分为3个阶段:石英-黄铜矿-黄铁矿-辉钼矿阶段(Ⅰ)、黄铁矿-方铅矿-闪锌矿-辉钼矿-石英脉阶段(Ⅱ)、石英-方解石-萤石阶段(Ⅲ)。流体包裹体测试结果表明:流体包裹体主要为气液两相包裹体(L型)、含CO2包裹体(C型)和纯CO2包裹体(PC型)。成矿Ⅰ阶段主要包括L型、C型和PC型流体包裹体,为典型的高温(集中在380.0 ℃~400.0 ℃)、中低盐度(集中在7.50 %~8.50 %)的CO2-NaCl-H2O体系;成矿Ⅱ阶段主要包括L型和C型流体包裹体,属于高温(集中在330.0 ℃~350.0 ℃)、低盐度(集中在4.25 %~5.00 %)的CO2-NaCl-H2O体系;成矿Ⅲ阶段仅包括L型流体包裹体,属于中低温(集中在280.0 ℃~300.0 ℃)、低盐度(集中在2.00 %~2.75 %)的NaCl-H2O体系。氢-氧同位素测试结果显示,δDV-SMOW为-115.8 ‰~-94.5 ‰,δ18OH2O为-8.32 ‰~0.28 ‰,暗示成矿流体主要来源于岩浆,含有少量大气降水。研究结果表明,该矿床成矿流体为中高温、中低盐度流体,流体不混溶促使金属矿物发生沉淀富集。

关键词:

流体包裹体;成矿阶段;氢-氧同位素;矿床成因;好力宝矿床

Abstract:

Haolibao Deposit,located in the east of Xilamulun metallogenic belt,is a porphyry Cu-Mo deposit.Ore bodies are mainly hosted in breccia zone of plagioclase granite porphyry,and are closely related to plagiogranite porphyry.The mineralization can be pided into 3 stages:quartz-chalcopyrite-pyrite-molybdenite stage(Ⅰ);pyrite-galena-sphalerite-molybdenite-quartz vein stage(Ⅱ);quartz-calcite-fluorite stage(Ⅲ).The results of fluid inclusions test show that the fluid inclusions are mainly gas-liquid twophase inclusions (L type),CO2containing inclusions(C type) and pure CO2 inclusions (PC type).Stage Ⅰ mainly includes L,C and PC type fluid inclusions,which are typical high temperature (380 ℃-400 ℃) and medium-low salinity (7.5 %-8.5 %) CO2-NaCl-H2O system; Stage Ⅱ mainly includes L and C type fluid inclusions,belonging to high temperature (330 ℃-350 ℃) and low salinity (4.25 %-5.00 %) CO2-NaCl-H2O system;Stage Ⅲ only includes L type fluid inclusions,belonging to the medium-low temperature (280 ℃-300 ℃) and low salinity (2.00 %-2.75 %) NaCl-H2O system.The results of H-O isotope test is that δDV-SMOW is-115.8 ‰--94.5 ‰δ18OH2O is-8.32 ‰-0.28 ‰,implying that the ore-forming fluid of the deposit is mainly from magma with a small amount of meteoric water.The results show that the ore-forming fluid of the deposit is of medium high temperature and low salinity,and the immiscibility of fluid promotes the precipitation and enrichment of metal minerals.

Keywords:

fluid inclusion;ore-forming stage;mineralization stage;H-O isotope;deposit genesis;Haolibao Deposit