Textural evidence bearing on the origin of isolated olivine crystals in C2 carbonaceous chondrites |
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| Authors: | Steven M. Richardson Harry Y. McSween |
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| Affiliation: | 1. Department of Geological Sciences, Harvard University, Cambridge, MA 02138 U.S.A.;2. Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 U.S.A. |
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| Abstract: | In some cases the mechanical competence of chondrules in carbonaceous chondrites has been reduced by alteration of their mesostasis glass to friable phyllosilicate, providing a mechanism by which euhedral olivines can be separated from chondrules. Morphological features of isolated olivine grains found in carbonaceous chondrites are similar to those of olivine phenocrysts in chondrules. These observations suggest that the isolated olivine grains formed in chondrules, by crystallization from a liquid, rather than by condensation from a vapor. |
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