地球巖石的化學(xué)組成

地球巖石的化學(xué)組成作者：卡卡西地球中微子?地球科學(xué)問題

CompositionoftheBulkSilicateEarth(BSE)CompositionoftheEarth’smantleCompositionoftheEarth’scrustUThK

巖石密度元素豐度結(jié)構(gòu)信息U和Th元素在地球中的總量和分布CompositionoftheBSEchondrite（球粒隕石）CosmochemistrymodelCompositionoftheBSEGeochemistrymodelCompositionoftheBSEGeochemistrymodelCompositionoftheBSEGeochemistrymodelTheKconcentrationintheEarthisprobablyonlycertaintoaboutafactoroftwo.CompositionoftheBSE?ThematterfromwhichtheEarthformedwasNOTchondritic;OrtheEarthhaslostmatterbycollisionalerosion.Massbalancerequiresthatamissingreservoir,whichwouldhosttheequivalentofthemoderncontinents’budgetofradioactiveheat-producingelements(U,ThandK),

yethasnotbeendiscovered.Wearguethatthisreservoircouldhavebeenlosttospace.CompositionoftheEarth’smantleUppermantle,MORBperidotite（橄欖巖）Lower

mantle,OIBbasalt（玄武巖）CompositionoftheEarth’smantleCi=CM*[F+D*(1-F)]-1Ci=CM*F/[1-(1-F)1/D]DepletedMantleEnrichedMantle(Srameketal.,2013)

HeterogeneouscompositionoftheEarth’smantle(Huang&Zhao,2006)

EnrichedMantle?CompositionoftheEarth’scrustOceaniccrust:Sediment（沉積物）Basalt（玄武巖）Gabbro（輝長巖）Continentalcrust:ComplexCompositionoftheEarth’scrustContinentalcrust

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uppercrustJUNO巖漿巖和變質(zhì)巖高SiO2=高U,Th(Gaoetal.,2020)

CompositionoftheEarth’scrustContinentalcrust

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lowercrustMetamorphicterranes（地體）Xenoliths（捕擄體）擠壓環(huán)境相對高SiO2拉張環(huán)境相對低SiO2U(ppm)(Huangetal.,2013)

CompositionoftheEarth’scrustHowtoformthecompositionoftheEarth’scrust?低SiO2熔體高SiO2陸殼高SiO2,U,Th低SiO2,U,Th拆沉模型風(fēng)化模型高SiO2巖石更抗風(fēng)化(Lietal.,2016)

CompositionoftheBulkSilicateEarth(BSE)HeterogeneouscompositionoftheEarth’smantleHowtoformthecompositionoftheEarth’scrustConclusionsUThK

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