資源描述:
《廣西栗木錫鈮鉭礦田礦化花崗巖鋯石SHRIMPU—Pb定年及其意義.pdf》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第29卷第4期華南地質(zhì)與礦產(chǎn)Vo1.29,No.4,292—2982013年12月GeologyandMineralResourcesofSouthChinaDec.,2013doi:10.3969~.issn.1007-3701.2013.04.004廣西栗木錫鈮鉭礦田礦化花崗巖鋯石SHRIMPU—Pb定年及其意義馬麗艷一,付建明一,程順波一,盧友月,徐德明,陳希清MALi—Yan一,F(xiàn)UJian—Ming一,CHENGShun—Bo一,LUYou—Yuel,XuDe—Ming,CHENXi—Qing(1.中國地質(zhì)調(diào)查局武漢地質(zhì)調(diào)查中心,武漢43020
2、5;2.中國地質(zhì)調(diào)查局花崗巖成巖成礦地質(zhì)研究中心,武漢430205)(1.WuhancenterofChineseGeologicalSurvey,Wuhan430205,China;2.InstituteofGraniticDiagenesisandMetallogeny,CGS,Wuhan430205,China)摘要:栗木礦田是南嶺地區(qū)典型的錫鈮鉭多金屬礦田,成礦作用與花崗巖關(guān)系十分密切。本文通過鋯石SHRIMPU—Pb法定年研究,獲得栗木礦田水溪廟礦區(qū)的隱伏礦化花崗巖形成年齡為212.3-4-1.8Ma(98%可信度,MSWD=1.5),與前人測
3、得的老虎頭礦區(qū)的云英巖化花崗巖中白云母的A卜Ar坪年齡(214.1Ma)、金竹源花崗巖中蝕變白云母Ar_Ar坪年齡(212.4na)及金竹源和三個黃?;◢弾r體鋯石SHRIMPU—Pb年齡(分別為214.0Ma和218-3Ma)在誤差范圍內(nèi)一致。結(jié)合其它資料分析,我們認為栗木地區(qū)錫鈮鉭礦與花崗巖為印支期同一構(gòu)造一巖漿活動的產(chǎn)物,建議在南嶺地區(qū)下一步規(guī)劃部署中應(yīng)注意印支期成礦巖體和印支期錫多金屬礦的尋找。關(guān)鍵詞:鋯石SHRIMPU.Pb年齡;礦化花崗巖;栗木錫鈮鉭礦田;廣西中圖分類號:P597+.3文獻標(biāo)志碼:A文章編號:1007—3701(2013)04—
4、292—07MaLY,F(xiàn)uJM,ChengSB,LuYY,XuDMandChenXQ.SHRIMPU-PbzircondatinganditssignificanceofmineralizedgraniteinLimuSn-Nb-Taore-field,Guangxi,SouthChina.GeologyandMineralResourcesofSouthChina,2013,29(4):292—298.Abstract:Sn-Nb—TamineralizationinLimu,atipicalhugeorefieldinNanlingRange,has
5、closerelationtograniticdiagenesis.ZirconSHRIMPU-PbdatingofmineralizedgraniteinconcealedShuiximiaostockwascorn—-ductedinthispaper,yieldinganageof212.3±1.8Ma(98%confidence,MSWD=I.5).Theresultiswellconsis—tentwiththoseagesfromgreisenizedgraniteinlaohutoudistrict(214.1Ma),muscovitili
6、zedgraniteinJinzhuyuan(212.4Ma,214.0Ma)andsangehuangniugranite(218.3Ma)inerrorrange.Compiledwithotherreferences,it’SclearthatbothSn——polymetallicdepositandgraniticstocksinLimuore-fieldareproductionofIndosiniandiage-neticandmetallogenticactivitiesinthisregion.Asknownbygeologistsin
7、Nanlingrange,fruitfulexplorationchievementshavebeenharvestedinthevicilityofcontactsofIndosiniangranites,SOmoreattentionmustbepaidontheexplorationandevaluationinthisregioninnextfewyears.Keywords:ZirconSHRIMPU—Pbdating;Mineralizedgranite;LimuSn-Nb-Taore—feild;Guangxi收稿日期:2013—09.18
8、;修回日期:2013—10—15.基金項目:中國地質(zhì)調(diào)查局地質(zhì)礦產(chǎn)調(diào)查評價專項項