地球的内核组成.ppt

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1、JieLiCarnegieInstitutionofWashingtonLivingPlanetSymposiumSeptember2002TheOrigin,Composition,andPropertiesoftheEarth'sCoreSize:radius3480km(1/2Earth)volume1/8Earthmass1/3EarthProperties:density10-13g/cm3pressure136-330GPatemperature5500±1500Kstateliq

2、uid-solidComposition:iron-nickelTheStateoftheEarth'sCoreCore-MantleBoundaryCoreformation~4.5GaOuterCoreConvectionGeodynamoInner-OuterCoreBoundarySecularcoolingRadioactivedecay?InnerCoreDifferentialrotationAnisotropyTheDynamicsoftheEarth'sCoreObservat

3、ionsExperimentsComputationWidmanstättenPatternDiamond-AnvilCellCraySV1StudytheCoreDensitydeficitAccuratetemperatureInnercoreanisotropyCoreformationCore-mantleinteractionGeodynamo…UnresolvedIssuesHETEROGENEOUSACCRETIONHOMOGENEOUSACCRETIONGravitational

4、energyCore-mantleequilibriumCorecompositionCoreFormation0.0012MantleAbundanceMantleSiderophileElementsintheMantleMantleCoreApparentpartitioncoefficientDi*=cicore/cimantleDi=ciFe-alloy/cisilicateEquilibriumpartitioncoefficientElementsPartitioningAlloy

5、Silicate100mmBSEImageRingwood66MantleHeterogeneousAccretion?"Excess"SiderophileElementsintheMantleProtocoreSolidmantleEarlyTerrestrialMagmaOceanGravitationalenergyGiantimpactAllendeCV3HomesteadL5ElementsPartitioningatHighP&TProtocoreSolidmantleCoreFo

6、rmationinaDeepMagmaOceanAlloy-SilicateEquilibriumCoreFormationinaDeepMagmaOceanHomogeneousaccretionGravitationalenergyCore-mantleequilibriumCorecomposition15141312111098Density,kg/m-3350300250200150100500Pressure,GPa6000500040003000200010000Depth,kmC

7、MBICBPREMFe5000KatICBDensityDeficitintheCorePREM:DziewonskiandAnderson81,ShearerandMasters90Fe:Maoetal.90,JephcoatandOlson87AbundanceAffinityforironYESDensityMeltingbehaviorSulfurintheCore?15141312111098Density,kg/m-3350300250200150100500Pressure,GPa

8、6000500040003000200010000Depth,kmCMBICBPREMFe5000KatICBDensityDeficitintheCorePREM:DziewonskiandAnderson81,ShearerandMasters90Fe:Maoetal.90,JephcoatandOlson87AbundanceAffinityforironDensityMeltingbehavior?SulfurintheCore?1barFeFeS+LFeST,˚CFe+FeSFe+LL