Ga’lale Copper-gold Deposit Ore-forming Elements Occurrence Status And Metallogcnic Mechanism,Tibet

Ga’lale Cu-Au deposit is located in the Geji County, Tibet province. The tectonicis in Bangong-River metallogenic belt western section, and it is located in place wherebelong to intersections of Shiquan River late Yanshan period combined belt andGangdese-Lhasa-Tengchon gland mass. Mining area exposure strata is LowerCretaceous Zenong Group Shangbulangjiu Formation, Lower Cretaceous Jiega Groupand Quaternary, Fault structures are development, followed by fold structures. Threekinds of intermediate-acid intrusive rocks which can be seen are a series of qiyiqiaosyrup mixed rock. The former has repeatedly to make a detailed study on petrologyand petrochemistry of quartz diorite, granodiorite and diorite-porphyrite, and considerthat granodiorite and diorite-porphyrite is close relationship with mineralization.In this paper, we through investigation and collected rock samples to makepolished thin sections, and make detailed system identification on rock samples byoptical microscopy and scanning electron microscopy. We do a further test analysis onthe mineral composition by some advanced equipment, such as X ray spectrometerand electron probe and so on. The mainly metal mineral in ore is complex types andVariety,metal minerals can be divided into:natural elements inminerals,oxides, sulfides, sulfosalts,tellurides, gold-silver compound, intermetalliccompounds and other specics. Non metallic minerals composed mainly of quartz、feldspathic、mica、serpentine、chlorite、amphibole、pyroxene、peridot、epidote.Ga’erqiong Cu-Au deposit mainly has copper minerals、gold and silver mineralSeries、bismuth minerals. Iron minerals、Lead minerals as a secondary or parageneticmineral, exist as an independent form, While silver is also associated with the naturalradioactive elements present in the form of silver.The main structure is divided according to the different ore geological formationfor hydrothermal contact metasomatic、hydrothermal filling type and supergeneweathering type structure. The main structure of the crystal structure of the ore,account structure, solid solution structure separation structure and stress. According fabrics Ore, ore material components, forming elements occurrence, mineralassemblages relations Gala Le copper-gold deposit will be divided into magmatichydrothermal stage of weathering and supergene mineralization of two times, Andfurther divided into magmatic hydrothermal mineralization of skarn-oxide phase,quartz-sulfide phase, carbonate-sulfide mineralization stage stage three.Ore-bearing rock Pb isotopic composition of lead isotopes over Gala Le crustalrocks lead-based, Mixed with a small amount of lead orogenic crust and mantle insubduction zones with characteristics of lead. Ore-bearing rock in the fine-grainedgranodiorite SHRIMP U-Pb zircon age of86.52±0.41Ma, Ore mining diorite GalaLe muscovite muscovite skarn statutory year using40Ar-39Ar, Obtain itsmineralization age of91.48±0.68Ma, This age close to the age of ore-bearing rockdiagenetic, Indicate diagenesis and mineralization with near simultaneity, LateCretaceous. To contact metasomatic deposit types skarn.