Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust

Details Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..129t&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 26, June 1991, p. 129-134. Research supported by MOESC and Mitsubishi Science Foundation.

Mathematics

Logic

69

Earth Crust, Metamorphism (Geology), Mineralogy, Planetary Evolution, Pyroxenes, Annealing, Antarctic Regions, Meteoritic Composition, Meteoritic Microstructures, Petrography, Planetary Geology

Scientific paper

The pyroxenes in two new monomict eucrites from Antarctica, Yamato 791186 and Yamato 792510, have been studied and compared with those of other Antarctic and non-Antarctic eucrites. The purpose of this study is to identify compositional and textural relationship shown by these pyroxenes which may be used as indicators of the thermal history of the meteorite. An attempt is made, using petrographic and compositional criteria, to distinguish between the initial cooling history and subsequent thermal events. It is suggested that it is possible to identify stages of thermal 'metamorphism' which may be used to indicate the conditions on the surface and crust of the parent body. A picture of the geological setting of the HED (Howardites, Eucrites, Diogenites) parent body is proposed, for which thermal metamorphism by impact heating is an important process.

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