Metamorphic effects in experimentally heated Krymka /L3/ chondriteExperimental charges of the Krymka unequilibrated ordinary chondrite heated from 500-1000 C have been examined petrographically for evidence of metamorphism. Of the petrologic criteria commonly used to distinguish types 4-6 chondrites, only changes in opaque mineral compositions are observed. Chemical and textural observations indicate development of a fine-grained intergrowth of taenite + troilite beginning at 700 C due to melting within the metal-rich portion of the Fe-Ni-S system, and minor reduction of troilite to metal, possibly through sulfur loss at higher temperatures. Overall textural integration, glass devitrification, and significant Fe-enrichment of ferromagnesian minerals are not observed because the short duration of these experiments was not sufficient for the development of other changes normally attributed to metamorphism in ordinary chondritic meteorites.
Document ID
19790055162
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mcsween, H. Y., Jr. (Tennessee Univ. Knoxville, TN, United States)
Taylor, L. A. (Tennessee, University Knoxville, Tenn., United States)
Lipschutz, M. E. (Purdue University West Lafayette, Ind., United States)