Geochemical Characteristics And Genesis Of Gold Deposits Of Dai Wang Shan, Inner Aohanqi

Gold deposit Dai Wang located in the Inner Mongolia junction that Chifeng CityAohanqi junction with,Tongliao City Naiman. Location in central Inner Mongoliageosynclinal fold system to the North China platform Harqin off Long transition site.Is currently small gold deposits of prospecting and mining.Gold deposit of Dai Wangbearing bearing ore rock formations is sandstone, Rare within the region, Neithercause attention of predecessors nor carry out the research work. Therefore,It’simportant guiding significance for studing genetic mechanism aspects of Dai Wanggold deposit,mineralization law of gold’area andcarry out prospecting work.Formation mechanism of Dai Wang gold deposit, Predecessors did not conduct acomprehensive and systematic study, We need to determine is the geologicalformation of gold deposits. Research for deposits in geological need Gold deposit andsurrounding geological, Temporal relationship between gold-bearing strata,geochemical correlation,in order to judge material source, the fluid source, water ofDai Wangshan mine process Material source,Final ensure fluid migration,accumulation, precipitation mechanism.Dai Wang Shan Mine’s ore-bearing strata under the Liquor Board sub-groupsegment, Gold mineralization is controlled by structural alteration zone. There are twotypes of Alteration zone,Silicified alteration zone and interlayer broken alterationzone. Silicified alteration zone is controled by faults, It is expressed maroonmetamorphic sand, siltstone rock crushing, silicified、hematitization、fluorite andpetrochemicals peacock. Strongly silicified,quartz and quartz vein stockworkdevelopment,Partly we can see bornite pyrite and cluster. Wall rock alteration havepyritization、silicified、sericite mainly in the low-temperature alteration zonation.Gangue minerals are mainly quartz and sericite,Followed by feldspar, calcite, clayminerals are also typical of the low-temperature mineral assemblages. Showed atypical low-temperature deposits in rock fabric.In Harker illustration, There are permian quartz diorite chemical composition showed a good linear relationship on theore-bearing rock,Explains diorite experienced some degree of fractionalcrystallization in the process of its formation. In K2O/SiO2illustration rock miningwere cast in high-K calc-alkaline series,In the diagram3.8Nb-Yb and illustrations3.9Rb-(Y+Nb) discrimination diagrams sample points are invested in the volcanic arcregion, Indicates that the rocks were formed in an island arc setting,Magma mainlyenriched Rb, K and other large LILE,Mainly loss of Ta, Nb, Ti, P high field strengthelements,These characteristics indicate that magma may form on the continentalmargin subduction-related environment or island. Summary, the gold deposits formedin an island arc setting. Extensional cause crustal thinning, lithospheric and crustalremelting.Gold is mainly controlled by the ductile shear zone,Mine memory in a ductileshear zone north east,Wide2km, long10km,High strain in the middle of the ductileshear zone in the well-peak mountain water,High strain zone development wellsGold,Jianshanzi gold, white gold valley, peak water Gold Mine. Ductile shear zonemakes sandstone fragmentation,Interlaminar developed fracture zone,Provideore-space for the latter part of the gold mineralization,Slate occurs ductiledeformation,To shield the migration of Ore-bearing hydrothermal. Meanwhile ductileshearing accompanied with gold-bearing pyrite, Resulting in an initial enrichment ofgold, Preliminary constitutes gold mineralization in the region.Native and False secondary fluid inclusions divided into3types: A type-gas-liquid two-phase inclusions,Type B-Three-phase inclusions containing CO2,Type C-pure CO2phase inclusions, Mainly in gas-liquid two-phase. The meantemperature of265℃, Salinity mean of5.53%,The mean density of1.0g/cm3. Fluidinclusions of Dai Wang gold deposit exhibit magmatic hydrothermal features ofmedium temperature, low salinity, low-density. From the main mineralization stage tolate mineralization and the late mineralization,All fluid inclusion homogenization aretemperature decreases, the salinity increases, the density has increased.Dai Wang Shan gold’s pressure of fluid inclusions between21.0MPa~29.5Mpa,Mineralization at depth between2.1Km~3.0Km, Are shallow range.Dai Wang gold deposit composition of fluid inclusions, there is a higher contentof CO2, N2, CH4. Explains the process of gold mineralization, Upper Carboniferousstrata Liquor Authority subgroup organic carbon involved in the transport of goldmineralization, precipitation, enriched mineralization. Mine exists the north-east ductile shear zone, Rich in organic matter of Liquor Board sub Formation form theconstruction of water from ductile shear deformation zone, provides the main sourceof fluid for the gold mineralization Dai Wang.S isotope composition show that sulfur isotope of Dai Wang Shan gold deposit ismore discrete,description of the host strata sulfur is also involved in goldmineralization. In the late mineralization quartz-calcite phase and mineralization latestage quartz veins began to shift precipitation and gradually increased.These characteristics suggest that Dai Wang Shan Gold Mineral deposit is lightto medium temperature magmatic hydrothermal orogenic gold deposits.