Show simple item record

dc.contributor.authorSahijpal, S.
dc.contributor.authorSoni, P.
dc.contributor.authorGupta, G.
dc.date.accessioned2021-02-12T22:30:15Z
dc.date.available2021-02-12T22:30:15Z
dc.date.issued2007-01-01
dc.identifier.citationSahijpal, S., Soni, P., & Gupta, G. (2007). Numerical simulations of the differentiation of accreting planetesimals with 26Al and 60Fe as the heat sources. Meteoritics & Planetary Science, 42(9), 1529-1548.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb00589.x
dc.identifier.urihttp://hdl.handle.net/10150/656326
dc.description.abstractNumerical simulations have been performed for the differentiation of planetesimals undergoing linear accretion growth with 26Al and 60Fe as the heat sources. Planetesimal accretion was started at chosen times up to 3 Ma after Ca-Al-rich inclusions (CAIs) were formed, and was continued for periods of 0.001-1 Ma. The planetesimals were initially porous, unconsolidated bodies at 250 K, but became sintered at around 700 K, ending up as compact bodies whose final radii were 20, 50, 100, or 270 km. With further heating, the planetesimals underwent melting and igneous differentiation. Two approaches to core segregation were tried. In the first, labelled A, the core grew gradually before silicate began to melt, and in the second, labelled B, the core segregated once the silicate had become 40% molten. In A, when the silicate had become 20% molten, the basaltic melt fraction began migrating upward to the surface, carrying 26Al with it. The 60Fe partitioned between core and mantle. The results show that the rate and timing of core and crust formation depend mainly on the time after CAIs when planetesimal accretion started. They imply significant melting where accretion was complete before 2 Ma, and a little melting in the deep interiors of planetesimals that accreted as late as 3 Ma. The latest melting would have occurred at <10 Ma. The effect on core and crust formation of the planetesimals final size, the duration of accretion, and the choice of (60Fe/56Fe)initial were also found to be important, particularly where accretion was late. The results are consistent with the isotopic ages of differentiated meteorites, and they suggest that the accretion of chondritic parent bodies began more than 2 or 3 Ma after CAIs.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectAccretion
dc.subjectdifferentiated Asteroid
dc.subjectShort-lived isotopes
dc.subjectthermal evolution asteroids
dc.titleNumerical simulations of the differentiation of accreting planetesimals with 26Al and 60Fe as the heat sources
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue9
dc.source.beginpage1529
dc.source.endpage1548
refterms.dateFOA2021-02-12T22:30:15Z


Files in this item

Thumbnail
Name:
15485-17838-1-PB.pdf
Size:
1.178Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record