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《皖南祁門(mén)地區(qū)東源鎢鉬礦區(qū)花崗閃長(zhǎng)斑巖SHRIMP鋯石U-Pb年齡和Hf同位素特征.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、第30卷第10期地質(zhì)通報(bào)Vo1.30.NO.102011年10月GEoLoGICALBULLETINOFCHINAoct..2011皖南祁門(mén)地區(qū)東源鎢鉬礦區(qū)花崗閃長(zhǎng)斑巖SHRIMP鋯石U—Pb年齡和Hf同位素特征王德恩,周翔,余心起,杜玉雕,楊赫鳴。,傅建真,董會(huì)明WANGDe—en,ZHOUXiange,YUXin—qi,DUYu—diao。,YANGHe—ming2,F(xiàn)UJian—zhen,DONGHui—ming1.安徽省地質(zhì)礦產(chǎn)勘查開(kāi)發(fā)局332地質(zhì)隊(duì),安徽黃山245000;2.中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)
2、院,北京1000831.No.332GeologicalTeam,AnhuiBureauofGeologyandMineralExplorationandDevelopment,Huangshan245000,Anhui,China;2.SchoolD廠EarthSciencesandResources,ChinaUniversityGeosciences,Beijing100083,China摘要:江家等系列花崗閃長(zhǎng)斑巖是皖南祁門(mén)縣東源鎢鉬礦區(qū)含礦巖體的組成部分,位于東源花崗閃長(zhǎng)巖的西側(cè)對(duì)江家和方村花崗閃長(zhǎng)斑巖進(jìn)行的S
3、HRIMP鋯石u—Pb測(cè)年結(jié)果表明,江家、方村花崗閃長(zhǎng)斑巖的結(jié)晶年齡為149~152Ma,與富鎢的東源花崗閃長(zhǎng)巖相近。巖石地球化學(xué)和鋯石Hf同位素分析顯示,江家等系列花崗閃長(zhǎng)斑巖源區(qū)具有復(fù)雜的多成分端元,其q-老鋯石核的正EHf值反映了成巖巖漿對(duì)晉寧期巖漿巖的繼承,震蕩巖漿環(huán)帶的負(fù)s值(一39.5—~2.86)指示源區(qū)的主要成分為古老的地殼物質(zhì),有少量地幔物質(zhì)的混染。全巖鋯石飽和溫度(737-913。C)顯示巖漿組成中有幔源物質(zhì)的貢獻(xiàn)。關(guān)鍵詞:花崗閃長(zhǎng)斑巖;SHRIMP鋯石U-Pb測(cè)年;鋯石Hf同位素;皖南東源礦區(qū)中圖分
4、類號(hào):P588.121;P597+.3文獻(xiàn)標(biāo)志碼:A文章編號(hào):1671—2552f2O11)10-1514—16WangDE,ZhouX,YuXQ?,DuYD,YangHM,F(xiàn)uJZ,DongHM.SHRIMPzirconU-PbdatingandcharacteristicsofHfisotopesofthegranodioriteporph【yriesintheDongyuanW-Mooredistrict,Qimenarea,southernAnhui.GeologicalBulletinofChina,2011,
5、30(1O):1514—1529Abstract:GranodioritesinJiangjiaandneighboringareasareore——bearingrockcomponentsoftheDongyuanW——ModepositinSOU出emAnhui.ThezirconSHRIMPU—Pbdatashowthattheserockbodieswereformedat149~152Ma.a(chǎn)lmostatthesametimewiththeformationoftheDongyuanW—richgranod
6、iorite.Thewhole—rockchemicalandzirconHfisotopicdataindicatethatthesemagmasourceshavecomplexmulti—componentend—memben.CLimagesrevealthattheyoungzirconsoccurasnewgrainsorrimsofhomogeneousstructurewithmagmaticzoning。whereasmostoftheoldagesOCCLlrincoresorassin~exenoc
7、rystsinNeoprotero-zoicgranodiorites,showingthatthemagmaticsourcecontainedconsiderableamountsofcomponentsofearlyigneousrocks.Youngmagmaticzirconzonesinthegranodioritessamplesareheterogeneousin8Hf(t)values(一39.5~-2.86),probablyindicatingthemixturebetweencrestandrD_
8、antlematerialsduringtheformationofthemagma,witholdcrustalrocksbeingthemainsource.ZirconHfiso-topicdataandbulk—rockzirconsaturationtemperature(737~913。C)indicat