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时间:2020-03-26
《黑龙江完达山地区358高地岩金矿床花岗斑岩LA-ICP-MS锆石U-Pb定年及其地质意义.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34卷第12期地质通报Vo1.34,No.122015年12月GEOLOGICALBULLETINOFCHINADec..2015黑龙江完达山地区358高地岩金矿床花岗斑岩LA—ICP-MS锆石u—Pb定年及其地质意义王庆磊,杨言辰,李骞,马晓阳2,谈艳,张国宾WANGQinglei,YANGYanchen,LIQian。,MAXiaoyang2,TANYan,ZHANGGuobin1.吉林大学地球科学学院,吉林长春130061;2.黑龙江省地质矿产局,黑龙江哈尔滨1500361.Colleg
2、eofEarthSciences,JilinUniversity,Changchun130061,Jilin,China;2.HeilongfiangBureauofGeologyandMineralResources,Harbin150036,Heilongjiang,China摘要:选取黑龙江省完达山地区358高地与成矿关系密切的花岗斑岩,进行系统的地质、岩相学、元素地球化学.E~LA—ICP—MS锆石u—Pb定年研究。结果显示:花岗斑岩具有富硅、钠、钾、铝,贫镁、钙的特征,里特曼指数(盯)
3、为1.12~2.00(盯<3.3),A/NK为1.36-2.00,A/CNK为1.11~1.93(A/CNK>1.1);富集大离子亲石元素,亏损Nb、Ta,严重亏损sr、P、Ti;轻稀土元素富集,重稀土元素亏损,具有负Eu异常。这些特征揭示,花岗斑岩是过铝质的s型花岗岩,岩浆来源可能为壳源。LA—ICP—MS锆石定年获得花岗斑岩的成岩年龄为128+_1Ma,推断金矿成矿时代应为早白垩世晚期。构造判别图解显示,花岗斑岩具有碰撞后花岗岩的特征,王i王岩体的形成很可能与太平洋板块俯冲作用后的伸展体制有
4、密切关系。关键词:完达山地区;LA—ICP—MS锆石U-Pb定年;S型花岗岩;碰撞后伸展中图分类号:P597+.3文献标志码:A文章编号:1671—2552(2015)12—2171—10WangQL,YangYC,LiQ,MaXY,TanY,ZhangGB.LA—ICP—MSzirconU—Pbdatingofgranite—porphyryfrom358UplandrockgolddepositinWandaMountainarea,HeilongjiiangProvinceanditsge
5、ologicalsignificance.GeologicalBulle—tinofChina,2015,34(12):2171—2180Abstract:The358UplandrockgolddepositislocatedattheeastedgeoftheWandaorogenicbelt,beingpartoftheCircum—Pacif-icmetallogenicbelt.Theauthorsselectedthegraniteporphyrycloselyassociatedw
6、ithmineralizationinthestudyareatoconductasystematicstudyofgeology,petrography,elementgeochemistryandLA—ICP—MSzirconU—Pbdatingresults.Accordingtothere-suitsobtained,thegraniteporphyryisrichinsilicon,sodium,potassium,aluminumandpoorinmagnesiumandcalciu
7、m,theRittmanindex(o-)is1.12to2.00(叮<3.3),A/NK=1.36~2.00,A/CNK=1.11-1.93(A/CNK>1.1).Thegranite—porphyryisenrichedinLILE,relativelydepletedinBa,NbandTa,severelydepletedinSr,PandTi;enrichedinLREE,anddepletedinHR~E,withEuanomalies.Thesecharacteristicsrev
8、ealthatthegranite—porphyryisperaluminous,andtheStypegraniteandmagmamighthavebeenofshellsource.LA—ICP—MSzircondatingmethodswereusedtodeterminetheageofthegranite—porphyry.ItisthusconcludedthatthegoldmetaUogenicepochshouldbelateEarlyCretaceous.Combinedw
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