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1、第42卷第3期中國(guó)地質(zhì)、,o1.42.NO.32015年6月GEOL0GYINCHINAJun..2015郭周平,趙辛敏,白贊,等.北祁連浪力克銅礦床鋯石U-Pb和輝鉬礦Re一0s年齡及其地質(zhì)意義[J].中國(guó)地質(zhì),2015,42(3):691-701.GuoZhouping,ZhaoXinmin,BaiYun,eta1.Z~conU—PbandmolybdeniteRe—OsdatingoftheLanglikecopperdepositinNorthQilianMountainanditsgeologicalim
2、plications[J].GeologyinChina,2015,42(3):691—701(inChinesewithEnglishabstract).北祁連浪力克銅礦床鋯石U-Pb輝鉬礦Re-Os年齡及其地質(zhì)意義郭周平趙辛敏白費(fèi)張江偉孔會(huì)磊(1.中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心,國(guó)土資源部巖漿作用成礦與找礦重點(diǎn)實(shí)驗(yàn)室,陜西西安710054;2.長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院,陜西西安710054)提要:浪力克銅礦床是北祁連造山帶中段冷龍嶺火山巖帶內(nèi)的一個(gè)中型銅礦床,銅礦體主要賦存于火山通道內(nèi)的石英閃長(zhǎng)玢巖及其鄰近的
3、安山巖中,文章在對(duì)礦化特征分析的基礎(chǔ)上,對(duì)其進(jìn)行了成巖成礦年代學(xué)研究。采用LA—ICP—MS鋯石U—pb~1]年技術(shù),得到含礦巖體石英閃長(zhǎng)玢巖的成巖年齡為(461.5~7.3)Ma,通過(guò)含輝鉬礦礦石中輝鉬礦的Re-Os同位素分析,獲得其模式年齡為(467.1+6.3)Ma-(471.3~6.7)Ma,等時(shí)線(xiàn)年齡為(470.5+3.4)Ma,表明礦床形成于中奧陶世,成礦與石英閃長(zhǎng)玢巖具有密切的時(shí)空關(guān)系。綜合分析表明,浪力克成巖成礦作用發(fā)生在北祁連洋俯沖形成的島弧環(huán)境,礦床具有斑巖(次火山巖)型礦床的特征,這對(duì)浪力克銅
4、礦床成因類(lèi)型的進(jìn)一步查明和指導(dǎo)找礦工作具有重要意義。關(guān)鍵詞:鋯石u—Pb年齡;輝鉬礦Re一0s年齡;浪力克銅礦;斑巖(次火山巖)型礦床;北祁連中圖分類(lèi)號(hào):P597+.3;P618.4文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000—3657f2015)03—069卜11ZirconU‘——PbandmolybdeniteRe‘——OsdatingoftheLanglikecopperdepositinNorthQilianMountainanditsgeologicalimplicationsGUOZhou—ping,ZHAOXi
5、n—min,BAIYun2,ZHANGJiang—wei,KONGHui—leif1.KeyLaboratoryfo,PStudyofFocusedMagmatismandGiantOreDeposits,MLR,Xi’anCenterofChinaGeologicalSurveym’an710054,ShaanxLChina,"2.EarthScience&ResourcesCollege,Chang’anXi’an710054,ShaanxLChina)Abstract:LocatedintheLenglong
6、lingvolcanicbeltofNorthQilianMountain,theLanglikecopperdepositisamedium—sizeddepositwithmineralizationmainlyoccurringinquartzdioriticporphyrite.Basedonai1analysisofthemineralizationfeaturesofthedeposit.theauthorsusedthezkconLA—ICP—MSU—PbandmolybdeniteICP—MSRe—
7、Oshighlyprecisedatingtechniquestostudytheore—bearingquartzdioriticporphyriteandfivesamplesofmolybdenumcollectedfromthedeposit.ZirconU—Pbdatingyieldedallageof(461.5士7.3、Maforquartzdioriticporphyrite.TheRe—Osmodelagesofthemolybdenitesamplesvaryfromf467.1士6-3Mato
8、(471.3+6.7)MaandtheRe—OsisochronageiS(470.5-4-3.4)Ma.ThesimilarzirconU-PbandmolybdeniteRe一收稿日期:2015—01—27;改回日期:2015—01—30基金項(xiàng)目:中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(1212011221043)資助。作者簡(jiǎn)介:郭周平,男,1980年生,助理研究員