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《Mineral Deposits》 2012-06
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Fluid inclusion characteristics and metallogenic evolution of Huajian gold deposit in eastern Hebei Province

SONG Yang1,WANG RuiJiang1,HU JianZhong2,WANG XiaoLong2,SUN Yan1,XIN HongBo1 and WU Han2(1 MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;2 Institute of Science Research,China University of Geosciences,Beijing 100083,China)  
The Huajian gold deposit is a typical quartz vein type gold deposit in eastern Hebei Province,and gold occurs mainly in polymetallic sulfide-quartz veins.Fluid inclusion studies show that there are three major types of fluid inclusions in gold ores of different ore-forming stages,i.e.,H2O-CO2 inclusions,aqueous fluid inclusions and high-salinity inclusions with daughter minerals.Microthermometic and Laser Raman spectrum analyses indicate that the H2O-CO2-NaCl fluid system of the early stage changed into the H2O-NaCl fluid system at the main metallogenic stage,with the peak value of homogenization temperatures reduced from 320℃ to 280℃.Ore-controlling structures from compression to extension and fluid immiscibility seem to be the main factors for gold precipitation.Hydrogen and oxygen isotope studies suggest that at the ore-forming stage the mineralizing fluids were mainly magmatic water,but at the end of the ore-forming process the mineralizing fluids became mixed fluids mainly due to the addition of meteoric water.Characteristics of sulfur and lead isotopes show that Au mainly came from the anatexis of Archean metamorphic rocks.The direct and indirect sources of ore materials were Niuxinshan garnites and Archean Zunhua Group respectively.The mineralization was related to deep magmatic activation.There existed direct genetic relation between the gold mineralization and the intrusion and stretching structure in Yanshanian intracontinental orogenesis.The magmatic activity brought stabilized thermal energy and Au-bearing fluid.Gold precipitated in the favorable fracture with the physical and chemical changes of the ore-forming fluid.
【Fund】: 全国危机矿山接替资源找矿专项典型矿床研究项目(编号:200899363)资助
【CateGory Index】: P618.51
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