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dc.contributor.authorElkins Tanton, Linda T.
dc.contributor.authorZuber, Maria
dc.contributor.authorWeiss, Benjamin P.
dc.date.accessioned2017-05-02T17:58:45Z
dc.date.available2017-05-02T17:58:45Z
dc.date.issued2011-05
dc.date.submitted2011-03
dc.identifier.issn0012821X
dc.identifier.urihttp://hdl.handle.net/1721.1/108598
dc.description.abstractChondritic meteorites are unmelted and variably metamorphosed aggregates of the earliest solids of the solar system. The variety of metamorphic textures in chondrites motivated the “onion shell” model in which chondrites originated at varying depths within a parent body heated primarily by the short-lived radioisotope 26Al, with the highest metamorphic grade originating nearest the center. Allende and a few other chondrites possess a unidirectional magnetization that can be best explained by a core dynamo on their parent body, indicating internal melting and differentiation. Here we show that a parent body that accreted to >~200 km in radius by ~ 1.5 Ma after the formation of calcium–aluminum-rich inclusions (CAIs) would have a differentiated interior, and ongoing accretion would add a solid undifferentiated crust overlying a differentiated interior, consistent with formational and evolutionary constraints inferred for the CV parent body. This body could have produced a magnetic field lasting more than 10 Ma. This hypothesis represents a new model for the origin of some chondrites, presenting them as the unprocessed crusts of internally differentiated early planetesimals. Such bodies may exist in the asteroid belt today; the shapes and masses of the two largest asteroids, 1 Ceres and 2 Pallas, can be consistent with differentiated interiors, conceivably with small iron cores with hydrated silicate or ice–silicate mantles, covered with undifferentiated crusts.en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (NSF Astronomy CAREER grant)en_US
dc.description.sponsorshipMitsui & Co. (U.S.A.), Inc. ( Mitsui Career Development Professorship)en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration (NASA Origins grant)en_US
dc.description.sponsorshipMassachusetts Institute of Technology (Victor P. Starr Career Development Professorship)en_US
dc.description.sponsorshipUnited States. National Aeronautics and Space Administration (NASA/Dawn co-investigator grant)en_US
dc.language.isoen_US
dc.publisherElsevier B.V.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.epsl.2011.03.010en_US
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.sourceProf. Weiss via Michael Nogaen_US
dc.titleChondrites as samples of differentiated planetesimalsen_US
dc.typeArticleen_US
dc.identifier.citationElkins-Tanton, Linda T., Benjamin P. Weiss, and Maria T. Zuber. “Chondrites as Samples of Differentiated Planetesimals.” Earth and Planetary Science Letters 305, no. 1–2 (May 2011): 1–10.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.approverWeiss, Benjamin Pen_US
dc.contributor.mitauthorElkins Tanton, Linda T.
dc.contributor.mitauthorWeiss, Benjamin P
dc.contributor.mitauthorZuber, Maria
dc.relation.journalEarth and Planetary Science Lettersen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsElkins-Tanton, Linda T.; Weiss, Benjamin P.; Zuber, Maria T.en_US
dspace.embargo.termsNen_US
dc.identifier.orcidhttps://orcid.org/0000-0003-4008-1098
dc.identifier.orcidhttps://orcid.org/0000-0003-3113-3415
dc.identifier.orcidhttps://orcid.org/0000-0003-2652-8017
mit.licensePUBLISHER_CCen_US


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