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Formation, Evolution and Mineralization of Ore-Forming Fluid for Copper Deposit in Zouping Volcanic Area in Shandong Province
详细信息   
摘要

The copper deposits related with volcanic magmatic hydrothermal action in Zouping area could be divided into mainly two types, one was porphyry-breccia copper deposit, and the other was epithermal copper deposit. There were Wangjiazhuang porphyry- breccia copper molybdenum deposit and Nandongzi epithermal copper gold deposit as representative deposits. The fluid inclusion study demonstrated that the homogenization temperatures and salinity of primary fluid inclusions in the mineralized quartz veins of the Wangjiazhuang copper molybdenum deposit were higher, a phenomenon was observed that the vapor-rich inclusions, the liquid-rich inclusions and the three-phase inclusions containing daughter minerals coexisted, meanwhile, vapor-rich inclusions homogenized to a single vapor phase and liquid-rich ones homogenized to liquid phase, which indicated that the ore-forming fluid was once boiling during its formation and evolution. The homogenization temperatures and salinity of primary fluid inclusions in the mineralized quartz veins of the Nandongzi copper gold deposit were lower, a coexisted phenomenon was not observed for the vapor-rich inclusions, the liquid- rich inclusions and the three-phase inclusions containing daughter minerals, indicated that the fluid was not once boiling. The ~18 OH2o- D projection drop of primary fluid inclusions in the mineralized quartz veins of the copper deposits wafted away from the magmatic water limits at Zouping area. It was deduced that the ore-forming fluid was mainly derived from the magmatic fluid and mixed with meteoric wa- ter in the late stage. Much of the meteoric water mixed and strong water/rock reaction mixed into the Nandongzi copper gold deposit.

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