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ID:34369033
大小:2.41 MB
页数:12页
时间:2019-03-05
《大别地体超高压变质岩石锆石lu-hf同位素研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、10000569/2007/023(02)033142ActaPetrologicaSinica岩石学报大别地体超高压变质岩石锆石LuHf同位素研究11,23陈道公倪涛谢烈文CHENDaoGong,NITaoandXIELieWen1.中国科学技术大学地球与空间科学学院中国科学院壳幔物质与环境重点实验室,合肥2300262.西北核技术研究所,西安7100243.中国科学院地质与地球物理研究所岩石圈构造演化国家重点实验室,北京1000291.CASKeyLaboratoryofCrustmantleMaterialsandEnvironments,Sch
2、oolofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026,China2.NorthwestInstituteofNuclearTechnology,Xian7100243.StateKeyLaboratoryofLithosphereEvolution,InstituteofGeologyandGeophysics,ChineseAcademyofScience,Beijing10002920060927收稿,20061227改回.ChenDG,NiTand
3、XieLW.2007.ZirconLuHfisotopiccompositionsofultrahighpressuremetamorphicrocksfromDabieTerrain,China.ActaPetrologicaSinica,23(2):331-342AbstractZirconLuHfisotopeanalyseswerecarriedoutforultrahighpressure(UHP)eclogite,jadeitequartziteandgneissfromShuanghe,andeclogiteandgneissfromHuan
4、gzhen,SouthernDabieTerrainbyusingLAMCICPMStechnique.Theresultsshow176177176177thateclogitesfromShuangheandHuangzhenandjadeitequartzitehavelowLu/HfandlowHf/Hfratio,whereasgneissesfrom176177176177twolocalitieshavehighHf/Hf,highandspreadLu/Hfcompositions.ZirconHfisotopedistributionsar
5、emainlydependedontheformationageofmetamorphicprecursor.MetamorphiczirconsucceededbasicallyHfisotopesoftheirprotolith.Metamorphicgrowth176177176177176177zirconshaverelativelowLu/HfbuthighHf/Hfratio,inheritedandrecrystallizedprotolithzirconshavehighLu/Hfand176177lowHf/Hfratio.Insomecas
6、esHfisotopecompositionsofmetamorphicandinheritedzirconsareundistinguishablewithinthesamerange.Itmainlycontrolledbyoriginofprotolithandzirconablationduringmetamorphism.ThelowLu/Hfratioofmetamorphicgrowth176177zirconswerecausedbythedecreasingofLuandincreasingofHf,andthehighHf/Hfratioori
7、ginatedfromtheadditionofhigh176radiogenicHffromotherhighLu/Hfmineralsevolution.TheinitialHfisotopecompositionofεHfandthemodelageofdepletedmantleTDMindicatethattheirageandoriginarealldifferentformetamorphicprecursor.ThesourcematerialofeclogitesfromShaungheshowthemixtureofmagmaderivedfr
8、omdep
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