Grain Size Distributions and Textures in the Matrices of Metamorphosed CO3 Chondrites

Details Grain Size Distributions and Textures in the Matrices of Metamorphosed CO3 Chondrites Grain Size Distributions and Textures in the Matrices of Metamorphosed CO3 Chondrites

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..159b&link_type=abstract

Lunar and Planetary Science, volume 27, page 159

Mathematics

Logic

2

Chondrites: Co, Grain Size Distributions, Matrixes, Metamorphism, Transmission Electron Microscopy

Scientific paper

We have examined the morphologies, textures and grain size distributions of fine-grained crystalline phases (dominantly olivine) in the matrices and fine-grained rims of 3 CO chondrites which range from petrologic subtype 3.1 to 3.6 in order to examine the physical changes which occur as a response to increasing degrees of equilibration. In moving through the petrologic sequence, the textural characteristics of individual grains show subtle, but progressive changes. Grain outlines become progressively less angular and aggregates of grains with tight grain boundaries become more common in contrast to individual grains which dominate in low petrologic types. All three meteorites show log normal grain size distributions indicative of either Ostwald ripening or condensation from a gas phase.

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