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时间:2020-04-27
《河南小秦岭金矿稀土元素地球化学特征及地质意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第28卷第6期现代地质Vol.28No.62014年12月GEOSCIENCEDec.2014河南小秦岭金矿稀土元素地球化学特征及地质意义冯建之,张灯堂,张为民,王杏村,崔燮祥,刘宗彦,王振强(河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023)摘要:小秦岭金矿产于新太古界太华群变质岩中,其中的次级拆离断裂为赋矿构造。为了探究矿床的地球化学特征和矿床成因,从矿区主要地质体采集了100件来自太华群地层、文峪岩浆岩和矿石的样品进行测试,其稀土元素的主要-6-6
2、特征为:太华岩群的ΣREE值为30.81×10~188.66×10;δEu值为0.62~1.24;花岗岩和脉岩类ΣREE值为58.22-6-6-6-6×10~365.98×10;δEu为0.90~1.10;矿石的ΣREE值多集中于76.74×10~358.22×10,δEu值多集中于0.74~1.14。结果表明:各地质体稀土总量接近,没有Eu异常或有微弱的正、负铕异常;矿石的稀土元素含量特征与太华群接近,而与文峪等花岗岩相差较远。分析认为,成矿物质主要来源于太华群地层而不是花岗岩。关键词:小秦岭金矿;稀土元素;成矿物质;河南省中图分类号:P618.51文献标志
3、码:A文章编号:1000-8527(2014)06-1151-10REEGeochemicalCharacteristicsofXiaoqinlingGoldDepositsandTheirGeologicalSignificanceFENGJian-zhi,ZHANGDeng-tang,ZHANGWei-min,WANGXing-cun,CUIXie-xiang,LIUZong-yan,WANGZhen-qiang(No.1InstituteofGeologicalandMineralResourcesSurvey,HenanProvincialBureau
4、ofGeo-explorationandMineralDevelopment,Luoyang,Henan471023,China)Abstract:TheXiaoqinlinggolddepositsarelocatedintheNeoproterozoicTaihuaGroup,ofwhichtheseconda-rydetachmentfaultsarethemajororebearingstructure.Inordertofigureoutgeochemicalcharacteristicsandgenesisoforedeposit,wecollec
5、ted100samplesfromtheTaihuaGroup,magmaticrocksandgoldoresofmaingeologicalbodyinthestudyarea,respectively.Themaincharacteristicsofrareearthelementsareasfollowing:-6-6theΣREEsofTaihuaGrouparefrom30.81×10to188.66×10,andtheδEuvaluesarefrom0.62to-6-61.24;ΣREEsofgraniteanddikerocksarefrom5
6、8.22×10to365.98×10,andtheδEuvaluesarefrom-6-60.90to1.10;ΣREEofgoldoresaremainlyconcentratedin76.74×10-358.22×10,δEuvaluesaremainlyconcentratedin0.74-1.14.TheresultsshowthattheΣREEfromthethreekindsofgeologicbodyaresimilar,andthereisnoEuanomalyorthereareonlyweaklypositiveandnegativeeu
7、ropiumanomaly.TherareearthdistributionoforesissimilartothatoftheTaihuaGroup,andisdifferentfromthatofWenyugranite.Itprovesthattheore-formingmaterialscomefromtheTaihuaGroupinsteadofgranite.Keywords:Xiaoqinlinggolddeposit;REE;ore-formingmaterial;HenanProvince中,是我国重要的黄金产地,其小秦岭金矿产于0引言新太古
8、界太华群变质岩中,近东西向次级拆离断[
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