Geological characteristics of Jihua Gold-Silver Deposit in Fujian and implications of element migration in the ore-bearing alteration zone for regional mineralization
A total of 36 gold-silver ore bodies have been delineated in the Jihua medium-scale shallow medium-low temperature hydrothermal gold-silver deposit,all of which occur in the NE fault structural alteration zone.Silver physical phase analysis shows that silver is mainly composed of silver sulfide and native silver.Silver and gold are generally coexisting in the same body,and both grades are positively correlated.The mineral assemblage of the main mineralization stage is characterized by quartz-pyrite-chalcopyrite-gold-silverite.4 alteration zones were divided along the horizontal(lateral)direction of the ore body.In order to determine the material migration during hydrothermal alteration,the standardized Isocon diagram method was used to calculate the material migration characteristics of altered fractured rocks.The results showed that Fe,Si,Mg,Ti,Cu,As,Mo,Co,Cr,La,Li,Ni,and V showed immigration characteristics during the alteration process;Na,Ca,Ba,Sr,and Nb migrated out.The emigration of Ca,Ba,and Sr indicates the cha-racteristics of silicon-rich and decalcified ore-forming hydrothermal fluids;by analogy with the previous research results of Qiucun Gold Deposit,Dongyang Gold Deposit,and Dadongkeng Gold Deposit in the same area,the 4 deposits are all formed by the gold and silver metallogenic system in central Fujian.They may be the regional metallogenic model of the subduction and retreat of the ancient Pacific plate,the migration of ore-bearing fluid along the volcanic mecha-nism,and acid dike channel to the shallow fault zone to precipitate mineralization.The research can provide ideas for the search for gold-silver deposits in the region.
万方数据
维普
