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1、礦物巖石地球化學通報·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVoI.33No.6,NOV.,2O14江西大嶺上鎢礦含斑細?;◢弾r鋯石成因及成巖成礦由口_==;、彭花明,袁琪。,夏菲。,嚴兆彬。,張婉婉。1.中國地質(zhì)科學院地質(zhì)研究所,北京100037;2.中國地質(zhì)大學(北京)地球科學與資源學院,北京100083;3.東華理工大學地球科學學院,南昌330013摘要:鋯石成因研究成果是鋯石定年、源區(qū)性質(zhì)示蹤和巖漿演化過程分析的基礎(chǔ)。本文利用陰極發(fā)光和LA
2、-ICP—MS技術(shù)發(fā)現(xiàn)研究區(qū)含斑細粒花崗巖包含了無繼承核鋯石和有繼承核鋯石。無繼承核鋯石陰極發(fā)光暗黑,其Th/U值低,LREE相對富集,Ce弱正異常,Ti溫度計得到地質(zhì)溫度為801℃,是形成于富含熱液的巖漿環(huán)境的鋯石。有繼承核鋯石殘留核具有均勻的灰白陰極發(fā)光,邊緣陰極發(fā)光暗黑,其Th/U值較高,LREE相對較低、ce正異常明顯,Ti溫度計得到地質(zhì)溫度為771℃,是形成于正常巖漿環(huán)境的中、深成巖漿巖中的鋯石。結(jié)合區(qū)域地質(zhì)情況,推斷殘留核鋯石很可能是晉寧期花崗閃長巖中的鋯石,說明礦區(qū)晉寧期花崗閃長巖可能是含斑細粒
3、花崗巖的一種源巖。無繼承核鋯石的結(jié)晶環(huán)境反映了當時巖漿已經(jīng)演化到晚期,而且其結(jié)晶時的富含熱液的巖漿可能是一種良好的成礦物質(zhì)的載體,值得進一步研究。關(guān)鍵詞:鋯石成因;含斑細?;◢弾r;成巖成礦;江西大嶺上鎢礦中圖分類號:P618.2文獻標志碼:A文章編號:1007—2802(2014)06083009doi:10.3969/j.issn.1007—2802.2014.06.O11OriginoftheZirconinFineGrainedGraniteinDalingshangTungstenDeposit,Ji
4、angxiandItsPetrogeneticandMineralizingImplicationsPENGHua—ming’。,YUANQi。,XIAFei。,YANZhao—bin。,ZHANGWan—wan。1.InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China;2.SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences(Beijing),
5、Beijing100083,China;3.CollegeofEarthSciences,EastChinaInstituteofTechnology,Nanchang330013,ChinaAbstract:Twokindsofzirconwerefoundinthefinegrainedgranitebyanglicizingthetraceelementsinthezirconanditscathodoluminescencecharacteristics.Thesimplezirconsarechar
6、acterizedbynocathodoluminescence,lowratioofTh/U,relativeenrichmentofLREE,weakpositiveanomalyofCeandTithermometergeologica1tempera—tureof801℃.Andtheywereclassedasthemagmaticzirconsformedinthemagmaenvironmentwithrichhydro—therm.Therelictcorezirconswerethetypi
7、calmagmaticzircons,whichhavethefeaturesofgreycathodolumines—cenceofmagmaticzircons,highratioofTh/U,relativelowIREE,obviouspositiveanomalyofCeandTither—mometergeologicaltemperatureof771℃.Therelictcorezirconscouldonlycomefromtheporphyriticgranitedio—ritesurro
8、undingrockofJinningPeriodbecauseitistheonlyplutonformingbeforeYanshanianPeriod.Andwecanknowtheporphyriticgranitedioritemaybeoneoftheoriginalrocksofthefinegrainedgraniterock.Keywords:originofzircon;fine