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Geology, Geochemistry And Genesis Of Aimusidaiyi-kekesala Iron-copper Deposit In Jinghe, Xinjiang

Posted on:2015-03-05Degree:MasterType:Thesis
Country:ChinaCandidate:H GaoFull Text:PDF
GTID:2250330428966834Subject:Mineralogy, petrology, ore deposits
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Xitianshan boluokenu metallogenic belt was mineralized by gold, copper, lead, zinc,Iron and Molybdenum, and its main deposit type is Skarn-porphyry copper-molybdenumpolymetallic deposits. Aimusidaiyi-Kekesala iron-copper skarn deposit is newlydiscovered in Boluokenu, we still cannot fully understand Aimusidaiyi-Kekesalairon-copper deposit because of the research level of it being low, This study based on fieldsurvey combiningwith multiple theories including mineralography, petrology, mineraldeposits and geochemistry of mineral depositshas acquired muc h information about thedeposit. Aimusidaiyi-Kekesala iron-copper deposit Research on microscopic identification,geochemical analysis and testing of fluid inclusionsand and ascertained its deposit type.Aimusidaiyi-Kekesala iron-copper deposit locates in the inside-outside contact zonebetween Husite pluton and UpperOrdovician Hudukedaban group. The deposit possessesthe characteristics of typical Skarn deposite because it is restricted by ignious rocks, stratalithology structural conditions and Wall rock alteration. Faults and fractures in deposit areaare main ore-bearing structures. Carbonatite being host rock of the ignious rocks provides afavorable condition for deposit developing.Host rock alteration characterized mainly bySkarnization controls the spacialdistribution of orebody.Ore structures contain taxitic structure, disseminated structure, vein structure andmassive structure. Ore textures contain crystallographic texture, metasomatic texture andseparation of solid solution structure. We divide the mineralization process ofAimusidaiyi-Kekesala iron-copper deposit into two mineralization epochs, namely Skarnperiod and quartz–sulfideepoch.The skarn period include dry skarn stage, wet skarn stageand oxide stage, the quartz–sulfideepoch include early quartz–sulfideepoch stage and Laterquartz–sulfideepoch stage.The study results of geochemistry indicate the ignious rocks in the deposit area aremainlygranidiorite, monzonitic granite and syenogranite belonging to metaluminous-weakperaluminous and high-K calc-alkalineI-type granite, formed in a continental margin arc environment.The study results of fluid inclusions from Aimusidaiyi-Kekesala iron-copper depositindicate the deposite was produced in middle-deep to shallow-seated environment,ore-forming fluids belong high temperature, high salinity and medium density. Duringmineralization, metallogenic pressure and depth are lowering continuously,homogenization temperature and salt content going down continuously, and metallogenicdensity increasing slightly. There are some boiling inclusions group in eiidote and quartz,fluid boiling cause precipitation of magnetite and copper.Ore characteristics, minerals coexisting relationship and ore textures ofAimusidaiyi-Kekesala iron-copper deposit suggest that the deposit is a typical Skarndeposit.
Keywords/Search Tags:Aimusidaiyi-Kekesala iron-copper deposit, metallogenic fluid, genesis ofmineral deposit, Skarn deposit, Xinjiang
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