Thermal histories of CO3 chondrites - Application of olivine diffusion modelling to parent body metamorphism

Details Thermal histories of CO3 chondrites - Application of olivine diffusion modelling to parent body metamorphism Thermal histories of CO3 chondrites - Application of olivine diffusion modelling to parent body metamorphism

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.106...73j&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 106, no. 1-4, Sept. 1991, p. 73-86. Research supported by University

Mathematics

Logic

15

Carbonaceous Chondrites, Metamorphism (Geology), Meteoritic Composition, Olivine, Petrology, Chondrule, Crank-Nicholson Method, Diffusion Coefficient, Geochemistry, Iron, Magnesium, Temperature Effects

Scientific paper

The 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.

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