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1、第68卷第1期有色金屬(礦山部分)2016年1月doi:10.3969/J.issn.1671。4172.2016.01.006贛中良山石英脈型鉬礦成礦地質(zhì)特征及成因初探沈滔,陳正樂一,韓鳳彬。,吳玉,伍俊杰(1.東華理工大學(xué)核資源與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室培育基地,南昌330013;2.中國地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所,北京100081)摘要:通過野外地質(zhì)勘測、顯微巖礦鑒定、包裹體熱力學(xué)測溫及同位素質(zhì)譜等測試,對良山石英脈型鉬礦的成礦地質(zhì)特征及其礦床成因機(jī)制進(jìn)行了初步的分析研究。綜合研究表明,鉬礦體多以長條狀、臘腸狀、透鏡狀形式產(chǎn)出,受不同級次NW—NNW小型構(gòu)造斷裂控制,與燕山期巖漿活
2、動密切相關(guān),輝鉬礦呈浸染狀、薄層狀、團(tuán)塊狀等賦存其中,并伴有黃鐵礦、黃銅礦的發(fā)育,成礦溫度主要集中于200~240~C,成礦壓力估計(jì)為15~58.5MPa,成礦深度為0.56~2.17km,礦石S值為一1.8‰~+1.9%o,顯示出巖漿硫特征且來源較為均一,成礦原始流體應(yīng)為巖漿熱液,而流體的混合作用及鉀化蝕變作用的進(jìn)行是該處金屬元素富集沉淀成礦的主要因素。關(guān)鍵詞:石英脈型鉬礦;成礦地質(zhì)特征;成因機(jī)制;良山;江西中圖分類號:TD15文獻(xiàn)標(biāo)志碼:A文章編號:1671—4172(2016)01—0023—05Ore—forminggeologicalcharacteristicsand
3、formationmechanismofLiangshanQuartz-VeinTypeMolybdenumDepositincentra1JiangxiProvinceSHENTao,CHENZhengle,HANFengbin,WUYu,WUJunjie(1.StateKeyLaboratoryofNuclearResourcesandEnvironment,EastChinaUniversityofTechnology,Nanchang330013,China;2.InstituteofGeomechanics,ChineseAcademyofGeologicalScien
4、ces,Beijing100081,China)Abstract:Basedonthefieldgeologicalinvestigation,microscopicidentification,inclusiontemperatures,andisotopicmassspectrometry,thispapercarriesoutapreliminaryanalysisoftheore—forminggeologicalcharacteristicsandformationmechanismoftheLiangshanQuartz-VeinTypeMolybdenumDepos
5、it.Theshapesofmolybdenumorebodiesmostlypresentaslongstrips,sausage—shapedandlenticular.TheorebodiesarecontrolledbythedifferentgradesofNW—NNWsmallfaultstructure,closelyrelatedtothemagmaactivitiesduringYanshanian.Molybdeniteshowsdisseminated,thinlayerandcrumbystructures,accompaniedbythegrowthof
6、pyriteandchalcopyrite.Theore-formingtemperaturemainlyconcentratedin200~CtO240~C.Pressureofthefluidisestimatedat15MPatO58.5MPa.Themineralizationdepthisapproximately0.56kmtO2.17km.TheSvaluesoforerangefrom一1.8‰to+1.9‰,itsisotopecompositionsshowthecharacteristicsofmagmaticsulfurandrelativelyhomog
7、e—nous.Initialore—formingfluidmightbemagmatichydrotherma1.Themainlyfactorsofore-formingmaterialenrich—mentandprecipitationarethemixingoffluidandpotassicalternation.Keywords:quartz—veintypemolybdenitedeposit;ore—forminggeologicalcharacteristic