Ore Fluids And Stable Isotope Geochemistry Of The Duobaoshan Prophyry Cu Deposit,Heilongjiang Province

Duobaoshan porphyry Cu(Mo)depositis a very important and typical large porphyry Cu-Mo-Au deposit in northern China.It is located in Central Asia-North East Xingmeng orogenic belt which situates in the northern margin of the North China Craton,its tectonic position is the eastern part of the Central Asian orogenic Belt.Duobaoshan porphyry Cu-Mo-Au deposit,is a huge complex tectonic-magmatic-hydrothermal system,which is induces by multi-stage hydrothermal activity and superimposed coupling.According to the symbiotic combination of different ore minerals and the formation of a different order of the veins,the veins formed by Duobaoshan mine were divided into four categories,namely:A vein,B vein,D vein,E vein,Their mineral assemblages were:A vein:quartz±feldspar±biotite±magnetite±minor chalcopyrite±a little pyrite;B vein:quartz± molybdenite±chalcopyrite±pyrite,D vein:quartz±molybdenite±chalcopyrite±pyrite,E vein:±calcite±hematite±pyrite±chalcopyrite ±specularite barite.Inclusion test results show that each vein homogenization temperatures were:A vein 110??200? and 270??360?;B vein 120??190?and240??300?;D vein 120??180?and 210??220?E vein 120??170?.Each vein salinity were:A vein 0.88?16.05NaCleqv;B vein 4.18?21.68NaCleqv;D vein 4.18?24.96 NaCleqv;E vein 3.4%?23.7%.Each vein density were:A vein 0.8?1.1Og/cm3;B vein 0.90?1.05 g/cm3;D vein 0.90?1.10 g/cm;E vein 0.97?1.05 g/cm3.Groups of inclusions composition analysis showed that:Duobaoshan deposit in fluid inclusions,the gas phase including mainly H2O and CO2,the liquid phase containing mainly cations Ca2+,followed by Na+ mainly anions SO42-and Cl-.Accordingly,the area of fluid based on NaCl-H2O system.Isotope test results show:hydrothermal calcite ?13CpDB to-3.2‰?-1.8‰,?18OSMOw to-4.0‰?-10.4‰?,with the progress of mineralization,813CPDB basically unchanged,?18OSMOW decreased,?34S values of sulfides varied from-2.9-0.1‰.Sulfur isotope carbon-hydrogen north-south belt display different stages of mineralization and fluid mainly from the mantle magma system,and has a meteoric and crustal material added.Comprehensive analysis show Duobaoshan Cu deposit belongs to typical porphyry copper mineralization model,multi-stage tectonic-magmatic complex formed Duobaoshan mining and ore mineral assemblages and typical porphyry alteration zonation,Ore-forming fluid was from the mantle magma and the crust flow into it in the late substances,With Caledonian granodiorite porphyry intrusion,Duobaoshan Cu deposit was formed by mutual coupling structure,magmatic fluid,formation,and many other elements ietercoupling.