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Thermal histories of CO3 chondrites - Application of olivine diffusion modelling to parent body metamorphismThe petrologic sequence observed in the CO3 chondrite group has been suggested to be the result of thermal metamorphism on a parent body. A model developed to examine the possibility that chondrule and matrix olivines equilibrated in situ, during parent body metamorphism is presented. The model considers Fe-Mg interdiffusion between chondrule and matrix olivines. Zoning profiles comparable to those observed in chondrule olivines from partially equilibrated members of the series are reproduced successfully. Metamorphism of CO3 chondrites on a parent body is therefore a viable model for the observed equilibration. Results indicate that peak metamorphic temperatures experienced by the CO3 chondrites were around 500 C, and that the range of peak temperatures between unequilibrated and equilibrated subtypes was relatively narrow, around 100 C.
Document ID
19920029597
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jones, Rhian H.
(New Mexico, University Albuquerque, United States)
Rubie, David C.
(Bayreuth, Universitaet Federal Republic of Germany, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1991
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 106
Issue: 4-Jan
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
92A12221
Funding Number(s)
CONTRACT_GRANT: NAG9-30
Distribution Limits
Public
Copyright
Other

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