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《蒙古國南戈壁Harshatewula地區(qū)二長花崗巖LA-ICP-MS鋯石U-Pb年齡及其地質(zhì)意義.pdf》由會員上傳分享,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。
1、第35卷第4期地質(zhì)通報(bào)V0l-35.No.42016年4月GEOLOGICALBULLETINOFCHINAApr.,2016蒙古國南戈壁Harshatewula地區(qū)二長花崗巖LA—ICP-MS鋯石U-Pb年齡及其地質(zhì)意義唐文龍,李俊建,付超,黨智財(cái),趙澤霖27OrolmaaDemberel。。AltankhundagaBatsaikhan3,DelgersaikhanAdiya,EnkhbatTserendashTANGWenlong,LIJunjian,F(xiàn)UChao,DANGZhicai,ZHAOZelin,O
2、ROLMAADemberel。,ALTANKHUNDAGABatsaikh,DELGERSAIKHANAdiya,ENKHBATTserendash1.中國地質(zhì)調(diào)查局天津地質(zhì)調(diào)查中心,天津300170;2.中國地質(zhì)科學(xué)院,北京100037;3.蒙古地質(zhì)科學(xué)院,蒙古烏蘭巴托211238;4.蒙古地質(zhì)調(diào)查局,蒙古鳥蘭巴托2112381.TianfinCenterofChinaGeologicalsTianfin300170,China;2.ChineseAcademyofGeologicalSciences,Beng1
3、00037,China;3.MongolianAcademyofGeologicalSciences,Ulaanbaatar211238,Mongolia;4.MongoliaGeologicalSume5Ulaanbaatar211238,Mongolia摘要:對蒙古國南戈壁Harshatewula地區(qū)二長花崗巖進(jìn)行LA—ICP-MS鋯石u—Pb精確定年。結(jié)果表明,該巖體LA—ICP—MS鋯石U-Pb年齡為326.4+I.iMa,成巖時(shí)代為早石炭世。本次所測巖體年齡是迄今為止該區(qū)獲得的較為可靠的直接測年數(shù)據(jù),為北
4、山構(gòu)造帶、哈爾力克一大南湖島弧帶與蒙古戈壁一天山古生代島弧巖漿巖帶為一條古生代島弧巖漿巖帶的認(rèn)識提供了年齡依據(jù),對該區(qū)構(gòu)造地質(zhì)演化研究具有重要意義。關(guān)鍵詞:鋯石;二長花崗巖;Harshatewula;蒙古國中圖分類號:P588.121;P597+.3文獻(xiàn)標(biāo)志碼:A文章編號:167卜2552(2016)O4—0559—06TangWL,LiJJ,F(xiàn)uC,DangZC,ZhaoZL,OrolmaaD,AltankhundagaB,DelgersaikhanA,EnkhbatT.LA—ICP—MSzir-conU—Pbd
5、atingofmonzograniteofHarshatewulaareainSouthGobiprovince,Mongolia,anditsgeologicalsignificance.GeologicalBulletinofChina,2016,35(4):559—564Abstract:HighprecisionLA—ICP—MSzirconU—PbdatingoftheHarshatewulamonzograniteswasconducted.Theanalysesindi-catethattheintr
6、usionwasformedat327.0±2.1Ma.belongingtoEarlyCarboniferous.Theageisarelativelyreliableanddirecdymea-sureddatumwhichprovidestheevidencefortheexistenceofanislandarcmagmatitebeltcomposedofBeishantectonicbelt,Har-hke—DananhuislandarcbeltandGobi—Tianshanislandarcmag
7、matitebelt.Thisresulthasgreatsignificancefortheunderstandingofthetectonic—geologicalevolutioninthisarea.Keywords:zircon;monzogranite;Harshatewula;Mongoha中蒙邊界Harshatewula二長花崗巖地處蒙古國1:20萬區(qū)調(diào)工作時(shí)進(jìn)行了少量簡單的地表工作,很南戈壁省Harshatewula地區(qū)南西部,該區(qū)地質(zhì)工作多巖體缺乏準(zhǔn)確年齡。1998年,蒙古與日本合作對程度低,只
8、在20世紀(jì)7o年代前蘇聯(lián)地質(zhì)專家開展該區(qū)1:20萬地質(zhì)圖進(jìn)行了修測,但是沒有對巖體時(shí)收稿日期:2015-10-23;修訂日期:2016-03-07資助項(xiàng)目:中國地質(zhì)調(diào)查局項(xiàng)目(編號:1212010561510、1212010811061、1212011120330、12120114001201、1212010781028、1212011085488)、國土資