欢迎来到天天文库
浏览记录
ID:37627279
大小:2.95 MB
页数:18页
时间:2019-05-26
《天津蓟县盘山I型-A型复合花岗岩体――区域构造环境转变的记录?》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、10000569/2007/023(03)052946ActaPetrologicaSinica岩石学报天津蓟县盘山I型—A型复合花岗岩体———区域构造环境转变的记录?12344杨富全赵越曾庆利吴海夏浩东12344YANGFuQuan,ZHAOYue,ZENGQingLi,WUHaiandXIAHaoDong1.中国地质科学院矿产资源研究所,北京1000372.中国地质科学院地质力学所,北京1000813.中国科学院地质与地球物理研究所,北京1000294.国土资源部实物地质资料中心,河北燕郊06520
2、11.InstituteofMineralResources,ChineseAcademyofGeologicalSciences,Beijing100037,China2.InstituteofGeomechanics,ChineseAcademyofGeologicalScience,Beijing100081,China3.InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China4.NationalGeolog
3、icalSamplesCenter,MinistryofLandandResources,Yanjiao065201,China20060817收稿,20070227改回.YangFQ,ZhaoY,ZengQL,WuHandXiaHD.2007.IandAtypecompositegranitesofthePanshanplutonintheJixian,Tianjin:arecordofregionaltectonictransformation?ActaPetrologicaSinica,23(
4、3):529-546AbstractTheLateTriassicPanshanIandAtypecompositegranitesarelocatedintheeasternsegmentoftheYanshanintracontinentalorogenicbelt.Inaccordancewiththeirintrudingorder,fromearlytolate,thecompositegranitescanbedividedintofourunits,theLangjiayu,Guanzhuan
5、g,DongluozhuangandXiaopanshanunits.TheLangjiayuandGuanzhuangunitsarecharacterizedbyItypegranite,butDongluozhuangandXiaopanshanunitsbelongtoAtypegranite.Investigationresuitshaveshownthatthefeaturesofpetrology,majorelements,traceelements,rareearthelementsand
6、SrNdisotopiccompositionsbetweentheItypeandAtypegranitesarequitedifferent.GeochemistryoftheItypegranitesisrichinalkalis(K2O+Na2O=8.15%~9.50%),Al(Al2O3=13.05%~15.49%),Ca(CaO=1.22%~3.02%),REE,Rb,Ba,HfandTb,poorinNb,P,Ti,ZrandTh.TheAtypegranitesarerichinSi,
7、alkalis,Th,Nd,Rb,Hf,anddepletedinREE,Ba,Sr,P,TiandZr,andhavehigherRb/SrandGa/Al,8786anddisplayobviouslynegativeeuropiumanomaly.TheSr/SrinitialratiosoftherockfromthePanshancompositegranitesrangingfrom0.70234to0.70628andtheεNd(t)valuesof-12.73to-15.70.Regional
8、settingandgeochemistrycompositiveanalysesuggeststhatthePanshanplutonwasemplacedinanenvironmentofregionalcompressionalshorteningtransformingtoextension.EarlyItypegranitesrecordthefeatureofregion
此文档下载收益归作者所有