2022, 41(2) 272-282 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Keywords
Ctypeadakites
EarlyTriassic
thickenedlowercrust
ShuangyangofJilin
Authors
ZHUShuhong
YUANPengyu
KONGFanqian
NIELijun
ZHANGHaiying
LIGuangtie
GUODaopeng
PubMed
Article by Zhushuhong
Article by Yuanpengyu
Article by Kongfanqian
Article by Nielijun
Article by Zhanghaiying
Article by Liguangtie
Article by Guodaopeng

Discovery of Early Triassic C-type adakitic rocks in Shimen reservoir of Shuangyang,Jilin and its geological significance

ZHUShuhong,YUANPengyu,KONGFanqian,NIELijun,ZHANGHaiying,LIGuangtie,GUODaopeng

RegionalGeologyandMineralResourcesSurveyofJilinProvince,Changchun130022,Chin

Abstract

TheShimenreservoirgranodioriteinShuangyangareaofJilinmostlyoccursasstocks.Acomprehensivestudyofpetrologicalcharacteristics,zirconUPbdatingandrockgeochemicalcharacteristicsofthegranodioritehasbeenconducted,inordertodeterminetheformationage,rocktype,magmasource,magmaticactivity andtectonicevolution.ZirconUPbdatingresultsshowthattheShimenreservoirgranodioritewasemplacedinthe EarlyTriassic(2463±12)Ma.Geochemicalanalysisresultsshowthatthegranodioritesamplesarerichinsodiumandpoorincalciumandmagnesium,withanA/CNKvalueof103~107,whichbelongstotheweakperaluminous,highpotassium,calcalkalineseries.TheyhavethecharacteristicsofenrichmentoflargeionlithophileelementsBa,Th,UandlightrareearthelementsLa,Ce,Pr,weaknegativeEuanomalies,obviouslightrareearth fractionation,insignificantheavyrareearthfractionationbutobviousdepletion.TheirhighAl2O3 (15-23% ~15-95%),Na2O(4-45% ~4-68%),Sr(63760×10-6 ~71770×10-6 )contentsandSr/Yratio(6118~9832),aswellaslowMgO(071% ~076%),Y(730×10-6 ~1060×10-6),Yb(071×10-6 ~109×10-6)contents,showthegeochemicalcharacteristicsofadakiticrocks.Moreover,consideringthehighK2Ocontent (288% ~346%)andRb/Srratio(008~012),lowMg#value(3447~3555)andCrcontent(486×10-6~525×10-6),itisfurtherdeterminedthattheoriginofthegranodioriteisduetothepartialmeltingofthe thickenedlowercrust.Combinedwiththeregionaltectonicevolution,itisbelievedthattheShimenreservoirEarly Triassicgranodioritewasgeneratedbythepartialmeltingofthethickenedlowercrustintheorogenicenvironment causedbythecollisionbetweentheNorthChinaplateanditsnorthernplate

Keywords Ctypeadakites   EarlyTriassic   thickenedlowercrust   ShuangyangofJilin  
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