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ID:51500551
大小:2.37 MB
页数:24页
时间:2020-03-25
《松潘—甘孜造山带北部岗龙地区巴颜喀拉山群地球化学特征和锆石U-Pb年代学特征对物源及构造环境的启示.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、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.35No.4,July,2016松潘一甘孜造山带北部岗龙地区巴颜喀拉山群地球化学特征和锆石U—Pb年代学特征:对物源及构造环境的启示崔加伟,郑有业,田立明2,孙君一,董俊1.中国地质大学(北京)地球科学与资源学院,北京100083;2.中国地质大学(武汉)资源学院,武汉430073摘要:为探讨岗龙地区巴颜喀拉山群沉积的形成构造环境和约束其物质来源,对其岩进行了锆石U—Pb定年和岩石地球化学研究。结果显示,巴颜喀
2、拉山群沉积岩主要为硬砂岩,SiO,=57.09%~71.96%,A1,O=10.46%~16.03%,CIA=49~63。稀土元素具有轻一中等的轻重稀土分异,具有弱的Eu负异常。巴颜喀拉山群碎屑锆石年龄分布范围大,有3个峰值:212~500Ma,1711~2000Ma,2200~2500Ma。研究表明,巴颜喀拉山群形成年龄在209~252Ma之间,其形成于岛弧环境中,且主要物质来源是昆仑地块和羌塘地块。关键词:岩石地球化学;碎屑锆石;物源分析;岗龙地区;松潘一甘孜造山带北部中图分类号:P597文章编号:1007—2802(2016)04一
3、O719—24doi:10.3969/j.issn.1007—2802.2016.04.O13GeochemicalCharacteristicsandZirconU-PbAgesoftheBayankalashanGroupintheGanglongAreaoftheNorthernSongpan—GanziOrogenicBelt:ImplicationforItsProvenanceandTectonicEnvironmentCUIJia—wei,ZHENGYou—ye’,TIANLi—ming,SUNJun—yi,DONGJnn1
4、.SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences(Beqing),Beijing100083,China;2.FacultyofEarthResources,ChinaUniversityofGeosciences(Wuhan),Wuhan430073,ChinaAbstract:Inordertodiscussthe~rmingtectonicenvironmentandtoconstraintheprovenanceoftheBayankalashangro
5、up,whichiswidelydistributedintheGonglongareaofthenorthernSongpan—Ganzifoldbelt,thezirconU—Pbdatingandpetro—geochemicalstudyoftheBayankalashangrouphavebeencarriedoutinthispaper.ResultsshowthattheBay—ankalashangroupismainlycomposedofgraywacke,withSiO2contentsof57.09%一71.96%
6、,A12O3contentsof10.46%一16.03%,andCIAvaluesvaryingfrom49to63,respectively.ItsLREEsandHREEsareslightlytomoderatelydifferentia—ted,weaknegativeEuanomaly,respectively.VariousU—PbagesofdetritalzirconsfromgraywackesoftheBayankalashangrouphavebeenobtainedandtheyareconcentratedma
7、inlyinthreegroupsof212—500Ma,1711—2000Ma,and2200—2500Ma.Basedontheabovestudy,itissuggestedthattheBayankalashanGroupwasprobably~rmedduringaperiodfrom209Mato252Mainanislandareenvironment,withitsmaterialsmainlysourcedfromtheQiangtangandtheKunlunterrains.Keywords:petro—geoche
8、mistry;detritalzircons;theprovenanceanalysis;GanglongArea;ThenorthernSongpan—Ganziorogenicbelt松潘
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