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时间:2020-03-26
《秦祁昆结合部瓦勒根金矿床含矿斑岩体岩石学和LA-ICP-MS锆石U-Pb年龄.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第7期地质通报Vol_33.No.72014年7月GE0LoGICALBULLETINOFCHINAJu1.,2014秦祁昆结合部瓦勒根金矿床含矿斑岩体岩石学和LA—IcP—Ms锆石u—Pb年龄李德彪,牛漫兰,夏文静,吴齐,王琳琳LIDe—biao,NIUMan—lan,XIAWen-ring一,WUQi,WANGLin—lin1.青海省地质调查局,青海西宁810001;2.合肥工业大学,安徽合肥230009;3.中国地质科学院地质研究所,北京100037;4.吉林省有色金属地质勘查局六。三队,吉林珲春1333001.QinghaiGeolog
2、icalS“eXi~ing810001,Qinghai,China;2.SchoolofResourcesandEnvironmentalEngineering,HefeiUniversityofTechnology,Hefei230009,Anhui,China;3.InstituteofGeology,ChineseAcademyofGeologicalSciences,Belting100037,China;4.No.603GeologicalParty,filinBureauofGeologicalExplorationforNonferrou
3、sMetals,Hunchun133300,Jilin,China摘要:秦祁昆结合部广泛发育中三叠世岛弧钙碱性岩浆作用,已发现大量与其相关的斑岩型一夕卡岩型铜金、铜钼和银铅锌多金属矿床。瓦勒根金矿床是近年来在该区新发现的一个斑岩型金矿床,矿区内出露有众多的石英斑岩和花岗斑岩,且均发育有金矿化,其中石英斑岩与金矿化关系更为密切。LA—ICP—MS锆石u—Pb年龄表明,花岗斑岩形成于中三叠-~-(237Ma),其中包含有丰富的晚古生代及元古宙继承性锆石。这一特征与区域上的斑岩型铜金矿床含矿岩体具有相似性。进一步说明,古特提斯洋在秦祁昆结合部发生向北消减所形
4、成的岩浆捕获了早于三叠纪的壳源和幔源物质,从而形成了岛弧钙碱性岩浆及相关的斑岩型一夕卡岩型矿床组合。关键词:LA—ICP—MS锆石u—Pb年龄;花岗斑岩;瓦勒根金矿;秦祁昆结合部中图分类号:P597+.3;P61851文献标志码:A文章编号:1671—2552(2014)07—1055—06LiDB,NiuML,XiaWJ,WuQ,WangLL.PetrologyandLA—ICP—MSzirconU-Pbageoftheore—bearingporphyryintheWalegengolddepositatthejunctureoftheQinlin
5、g—Qilian—Kunlunorogens.GeologicalBulletinofChina,2014,33(7):1055-1060Abstract:ThemiddleTriassiccalc—alkalinearcmagmatismanditsrelatedporphyry—skarntypeCu—Au.Cu—MoandAg—Pb—ZnpolymetallicdepositsarewidespreadatthejunctureofQinling—Qilian—Kunlunorogens.TheWalegenAudepositisanewly—d
6、is—coveredporphyrydeposit.ThehostrocksoftheWalegendepositarequa~zporphyryandgraniteporphyry,withthequartzporphy—rymorecloselyrelatedtOgoldriftneralization.rheresultsofzirconU—PbanalysisbyusingLA—ICP—MStechniqueindicatethatthegraniteporphyrywasformedinmiddleTriassic(237Ma),andcon
7、tainedvoluminousPaleozoic—Proterozoicinheritedzircons.ThesecharacteristicsaresimilartocharacteristicsofotherporphyryCu—Audepositsinthisregion.Thesedatasuggestthatthemag—masproducedbynorthwardsubductionofPaleo—tethysoceancapturedpre—Triassiccrustandmantlematerials,resultinginthea
8、rcmagmatismandthefomlationofrelatedporphyry—ska
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