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1、2013年12月礦床地質(zhì)第32卷第6期December,2013MINERALDEPOSITS32(6):1l59~1170文章編號:0258—7106(2013)06—1159—12DonJavier斑巖型銅鉬礦床地質(zhì)特征吳斌,方針,葉震超2一(1中國地質(zhì)大學,北京100083;2中南大學地球科學與信息物理學院,湖南長沙410083)摘要DonJavier礦床是在秘魯南部新發(fā)現(xiàn)的大型斑巖銅鉬礦床,位于秘魯古近紀斑巖型銅鋁成礦帶內(nèi)。該礦區(qū)主要出露Yarabamba花崗閃長巖體,NW走向的礦體賦存于英安斑巖及其圍巖中。主要的礦石礦物有黃銅礦、輝鉬礦、輝銅礦等。礦化蝕變由內(nèi)向
2、外依次為鉀化、石英一絹云母化、泥化、青磐巖化,具有典型斑巖型銅礦床的蝕變分帶特征。礦體呈筒狀,主要分布于石英一絹云母化蝕變帶中。礦區(qū)內(nèi)的英安斑巖有4期,其中的前2期與礦化有關,后2期為成礦后侵位。NW向斷裂是區(qū)內(nèi)主要的控礦構造,對成巖成礦具有控制作用。與同一成礦帶內(nèi)相鄰的CerroVerde超大型斑巖型銅礦床相比較,兩者具有類似的成礦特征。找礦實踐表明,強烈的蝕變帶、低阻高極化激電異常是找礦的有效標志。關鍵詞地質(zhì)學;斑巖銅礦;斑巖期次;礦化蝕變;礦床對比;DonJavier;秘魯中圖分類號:P618.41;P618.65文獻標志碼:AGeologicalcharacter
3、isticsofDonJavierporphyrycoppermolybdenumdepositWUBinI.FANGZhenandYEZhenChao2(1ChinaUniversityofGeosciences,Beijing100083,China;2SchoolofGeosciencesandInfo-Physics,CentralSouthUniversity,Changsha410083,Hunan,China)AbstractTheDonJavierdepositisalarge—sizeporphyryCu-Modepositnewlydiscovered
4、insouthernPeru.Itis1o—catedinthePalaeogenecopperandmolybdenummetallogenicbeltofPeru.ThemainoutcropintheminingareaisthegranodioriteofYarabamba.a(chǎn)ndtheNw—strikingorebodyishostedinthedaciteporphyryanditscountryrock.Theprincipaloremineralsmainlyincludechalcopyrite,molykIdeniteandchacocite;from
5、theinnerpartoutwardsthemineralalterationsarepotassicalteration,quartz-sericitization,argillizationandpropylitization,withtypicalporphyrycopperalterationzonation;theorebodypresentscylindricalformandismainlydistributedinthequartz—sericitizationzone;thedaciteporphyryintheminingareaconsistsof
6、4phasesofdaciteporphyries,amongwhichtheformer2phasesareassociatedwithmineralization,whereasthelatter2phasesbelongtopostmineralizationemplacement.TheDonJavierdepositissimilartothenearbyCerroVerdedeposit,asuperlargecopperporphyrydepositinthesamemetallogenicbelt.inmetallogeniccharacteristics
7、.TheNw—strikingfractureisthemainore—controllingstructure,whichcontrolledtherock—formingandore-formingprocess.ProspectingpracticeverifiesthatintensealterationbeltsandlowresistivityandhighIPanomaliesareeffectiveindicatorsintheprospectingactivity.Keywords:geology,porph