| Huangshandong deposit is a large Cu-Ni sulfide deposit located in the territory ofHami City, Xinjiang Uygur Autonomous Region.The tectonic position is in the easternpart of the suture zone and Kangguer Kanggur big break is on the north side of Harlik-Dananhu island arc zone. In this paper, through the regional geological features of thestudied area, the geological characteristics of the deposit, ore-rock characteristics, basicgeochemical characteristics and diagenetic mineralization age studies of Cu-Ni sulfidedeposit Huangshandong understanding are as follows:Huangshandong copper-nickel sulfide deposit and ore-bearing rock Huangshandongare in close relationship, which is the Huangshandong geological rock mineralization.Huangshandong rock facies zonation are quite evident, mainly including diorite, peridotite,gabbro and other facies, and their petrographic has a better differentiation.Huangshandong ore-bearing rock occur in the dry pier group（C1g）. The deposit oretypes are the type of ore in situ melting, melting away-penetration type ore and so on.Nickel ore mainly includes minerals pyrite, pyrrhotite, chalcopyrite etc; gangue mineralsare consist of olivine, pyroxene, plagioclase, hornblende,etc., followed by biotite, andquartz. There are sliding wall rock alteration petrochemical, chlorite, serpentinetechnology, tremolite and so on. According to the ore body characteristics, ore mineralassemblages, fabric and other ore characteristics determine Huangshandong Cu-Nideposits in magmatic, hydrothermal period of three supergene mineralization, which canbe divided into early magmatic crystallization stage and late-magmatic magmaticcrystallization stage. The main ore-bearing rock Huangshandong oxide content:38.30%~53.02%(SiO2),0.205%~3.88%(TiO2),4.43%~24.9%(Al2O3),0.21%~13.7%(CaO),1.66%~31.25%(MgO), full-alkali(K2O+Na2O)was0.12%~7.12%, K2O/Na2O majority of lessthan1(0.024~0.541); Huangshandong mafic-ultramafic rock generally has a relativelyhigh Rb,Sr, Ba and other large LILE and lower Nb, Ta high field strength elements;ΣREE=11.22×10-6~67.64×10-6, LREE/HREE ratio of1.99~4.43, δEu betweenbetween0.72to2.57. These geochemical studies show that the main component ofHuangshandong rock with sub alkaline mafic-ultramafic rocks characteristic; mafic-ultramafic rocks generally have relatively high field strength elements, or large low LILE;severity REE fractionation between the slightly stronger, lighter, two heavy REEfractionation between weak internal elements.The work to get the ore-bearing rock Huangshandong gabbro diorite (HSD-15),gabbro-diorite (HSD-16), olive gabbro (HSD-37) of the LA-ICP-MS zircon U-Pb ages of278.1±1.9Ma,279.6±1.9Ma,278.5±2.1Ma, combined with the results of previousstudies, the formation of the Permian era Huangshandong rock. Combined with tectonicsetting, Huangshandong rock formation after the collision should be the extension phase.At this stage, with the termination of the compressive stress of the subduction process andby increasing the proportion of subducted slab impact, making the occurrence of breakingaway from the subducting plate, spreading with lithospheric mantle thinning occurring ondeep mantle upwelling asthenosphere, prompting the main collisional plate was cut andexplanation transformed mantle asthenosphere material is heated and partially melted,forming basaltic magma. This magma emplaced in Carboniferous strata of rock to formHuangshandong. |
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