The Geological Feature And Ore Genesis Of Liuyang Qibaoshan Polymetallic Ore Deposit

In the thesis ,the geological feature and ore genesis of the Liuyang Qibaoshan polymetallic ore deposit had been studied detailedly and systematacially by the theories of deposit , mineralogy of ore deposit .distinctive mineral and minerageny ,and by the techniques of petrology .petrochemistry .geochemistry etc.The Qibaoshan polymetallic deposit was distributed around the intrusive rock ,and has diversitfied ore genesis style for the different property of wall rocks . they were as follows :skarn deposit Jhiydrothermal solution filling deposit and weathered residual mineral deposit.The deposit's geological feature and ore genesis were analogical reasoning by contrast the commons and differents between the intrusive and deposit in the thesis .At first , In the aspect of trace element and major metallogenic element, the content's change trend of the both was concordia and all higher than the crustal abundance or average abundance hi acid rock and so affinitive.And then , the all specified parameters about lanthanon showed the granite magma had got through a perfect crystallization and diagenetic differentiation. This was the essential precondition to form ore -bearing hydrothermal solution ,and it can be deducted from synthesize the trace element and lanthanon that geotectonic setting was collision and subduction zone of plates .The third , it could be deduced from that sulfur isotope composition was close to the feature of meteorite sulfur that the sulfur originated mainly from original sulfur unfractionated , and lead isotope ratio showed the ore geniss of the Liuyang Qibaoshan polymetallic deposit related to the intrusive rock.Finally ,the physical-chemical condition about the deoposit was demonstrated by studying detaildely gas-liquid inclusion.To sum up , the polymetallic deposit's genesis course was as follows:The mantle magmatic melt raised led to remelting of partial lower crustal layer, forming the enriched polymetallic crust-mantle granite magma ,and the got the hydrothermal ore-forming solution during the granite magma's crystallization and diagenetic differentiation .finally , abundant sulphide deposited when reaction took place between the solution and wall rocks.