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《青海西部祁漫塔格地區(qū)主要矽卡巖鐵多金屬礦床成礦地質(zhì)背景和礦化蝕變特征.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、2013年2月礦床地質(zhì)第32卷第1期February,2013MINERALDEPOSITS32(1):1~19文章編號(hào):0258—7106(2013)01—0001—19青海西部祁漫塔格地區(qū)主要矽卡巖鐵多金屬礦床成礦地質(zhì)背景和礦化蝕變特征趙一嗚,豐成友,李大新,劉建楠,肖曄,于淼,馬圣鈔(中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所,北京100037)摘要青海西部祁漫塔格地區(qū)矽卡巖鐵多金屬礦床分布廣泛,目前已成為中國(guó)西部最重要和最有找礦潛力的矽卡巖鐵多金屬成礦帶。在大地構(gòu)造上,該地區(qū)屬東昆侖造山帶;成礦主要與印支期(204-237Ma)閃長(zhǎng)巖、花崗閃
2、長(zhǎng)巖和二長(zhǎng)花崗巖有關(guān);控礦地層包括薊縣系狼牙山組大理巖、硅質(zhì)巖,奧陶系一志留系灘問(wèn)山群大理巖、碎屑巖、硅質(zhì)巖、中一基性火山巖和石炭系結(jié)晶灰?guī)r、碎屑巖等。區(qū)內(nèi)發(fā)育3類矽卡巖,即鈣矽卡巖、鎂矽卡巖和錳質(zhì)矽卡巖,以前者為主。鈣矽卡巖常伴生Fe、Cu、Mo(Pb,Zn)礦化,鎂矽卡巖主要伴生Fe礦化,錳質(zhì)矽卡巖則伴生Pb、Zn(Ag)礦化;礦石礦物組合多種多樣,礦化具有一定的分帶性。內(nèi)接觸帶侵入巖廣泛發(fā)育鉀長(zhǎng)石化,與矽卡巖類型一起構(gòu)成該類礦床的重要找礦標(biāo)志之一。關(guān)鍵詞地質(zhì)學(xué);成礦地質(zhì)背景;鐵多金屬礦床地質(zhì)特征;矽卡巖類型;鉀質(zhì)交代現(xiàn)象;祁漫塔格
3、地區(qū);青海中圖分類號(hào):P618.31文獻(xiàn)標(biāo)志碼:AMetallogenicsettingandmineralization-alterationcharacteristicsofmajorskarnFe-polymetallicdepositsinQimantagarea,westernQinghaiProvinceZHAOYiMing,F(xiàn)ENGChengYou,LIDaXin,LIUJianNan,XIAOYe,YUMiaoandMAShengChao(InstituteofMineralResources,ChineseAcadem
4、yofGeologicalSciences,Beijing100037,China)AbstractFe—polymetallicskarndepositsarewidelydistributedintheQimantagareaofwesternQinghaiProvince.Recently,thisareahasbecomeamajormetallogenicbeltwithmostpromisingorepotentia1.Geotectonically,itbelongstoEasternKulunorogenicbelt.M
5、ineralizationisrelatedtoIndosinian(204-237Ma)diorite,granodi—oriteandmozoniticgranite.Ore—controllingstrataarecomposedofmarbleandsilicaliteofmiddleProterozoicLangyashanFormation,marble,clasolite,silicaliteandandesite—basalticvolcanicrocksofOrdovician—SilurianTanjianshanG
6、roup,andcrystallinelimestoneandclasoliteofCarboniferousperiod.Intheoredeposits,threetypesofskarnsaredeveloped,i.e.calcic,magnesianandmanganoantypes,withthefirsttypebeingdominant.CalcicskarniscommonlyassociatedwithFe,Cu,Mo,(Pb,Zn)mineralization,magnesianskarnismainlyas—so
7、ciatedwithFemineralization,andmanganoanskarnisalwaysassociatedwithPb,Zn(Ag)mineralization.Mineralassemblageoftheoresisextremelyvariedandhascertainzonation.Potassicmetasomaticphenomenaareveryentensiveintheendo—contactzonesofthedeposits.Inadditiontodifferenttypesofskarns,p
8、otassicmeta—somatismalsoconstitutesoneoftheimportantore—searchingindicators.*本文得到中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(編號(hào):12120