A Thickness Gauge for the Lithosphere Based on Ce/Yb and Sm/Yb of Mantle-Derived Magmatic Rocks-中国Betway体育网页登陆

摘要 Anewmethodfordeterminingthepartialmeltingdepthofmantle-derivedmagmaandlithosphericthicknessincontinentalregionsisderivedfromREEgeochemistry.ThiseffectivetechniqueusesvariationsintheCe/YbandSm/YbratiosfoundinmainlyvolcanicrocksincontinentalChina.TheratioschangewiththedepthoforiginconsistentwiththecorrelationbetweenlithosphericthicknessandtheCe/YbandSm/Ybratiosfoundinoceanicbasalt.Theseratiosincreaseexponentiallywiththedepthoforigin,thelithosphericthickness,ofawidevarietyofCenozoicvolcanicbasaltandPaleozoickimberliteintheNorthChinaCraton,northeasternChinacontinentandvicinity.Thisfunctionalrelationshipwithdepthisshowninaplotoftheratiosthatformsaconcordiacurve,whichiscloselyexpressedbyformulasusing8-degreepolynomials.Theseprovideamoreaccurategageinmeasuringthelithosphericthicknessthanthetraditionalgeophysicalmethods.Whenappliedtovolcanicrockofdifferentagesitalsorevealshowthethicknesshaschangedovertimeandthus,greatlyaidstheunderstandingofthetectonichistory.RelationsbetweentheCO2content,mineralreactionsandpressureintheupperasthenospherebeneaththebaseofthelithosphereappearstoaffecttheproportionsofREEinpartialmeltsandbringsaboutaclosecorrelationbetweenlithosphericthicknessandtheCe/YbandSm/Ybratiosinmantle-derivedmagmaticrock.Thisthicknessgauge,forbothcontinentalandoceaniclithosphere,providesanewapproachinanalyzingthelithosphericthicknessindifferenttectonicsettingsandgeologictimes.

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A Thickness Gauge for the Lithosphere Based on Ce/Yb and Sm/Yb of Mantle-Derived Magmatic Rocks

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