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冀东古元古代基性岩墙群的年龄及地球化学21Ga伸展及-岩石学报
10000569/2017/033(09)282749 ActaPetrologicaSinica 岩石学报
冀东古元古代基性岩墙群的年龄及地球化学:
~21Ga伸展及 ~18Ga变质
杨崇辉 杜利林 耿元生 任留东 路增龙 宋会侠
YANGChongHui,DULiLin,GENGYuanSheng,RENLiuDong,LUZengLongandSONGHuiXia
中国地质科学院地质研究所,北京 100037
InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China
20170319收稿,20170628改回
YangCH,DuLL,GengYS,RenLD,LuZLandSongHX2017Paleoproterozoicmetamacdykeswarmsintheeastern
Hebeimassif,theeasternNorthChinaCraton:~21Gaextensionand~18GametamorphismActaPetrologicaSinica,33
(9):2827-2849
Abstract ThepreviousresearchintheNorthChinaCratonwaslimitedtothe~25GaeventintheEasternandWesternblocks,
andthe22~20Ga,195~18GaeventsoftheCentralOrogenicBeltbetweenthemThegeochronologicalandgeochemicalstudies
oftheShimenmetamaficdykeswarmfromeasternHebeiProvince,yieldformationageat2162±27Maandmetamorphismat1820±
78Ma,throughSHRIMPzirconUPbdatingThecountryrockofthedykes,thetonaliticgneiss,wascrystallizedat2531±14Ma,
andsubsequentgranulitefaciesmetamorphismat2513±15MaAlthoughtheShihmenmetamaficdykesexperienceda~18Ga
metamorphism,thesurroundingtonaliticgneissdidnotshowanysignsofmetamorphismormetamorphiczirconsatthistimeIn
geochemistry,thedykesareslightlyrichinLREE,andweaklynegativeEuanomalies,enrichinginLILE(Rb,Ba),aswellas
depletedinHFSE(Nb,Ta,Ti),indicatingthefeatureoftholeiiticbasaltMeanwhilethedykeshowsalowpositive (t)value
ε
Nd
(147)andzirconpositive (t)(188~880)WhiletheHfmodelage,2206~2338Ma,isclosetotheformationageofthe
ε
Hf
metamaficdykesItsuggeststhatthebasalticmagmaofthemaficdykewasderivedfromthepartialmeltingofthedepletedmantle
whichhasundergonecrystallizationdifferentiationandcrustalcontaminationprocess(AFC)ThusweinferthattheShimemaficdyke
formedintheintracontinentalenvironm
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