Cooling Rates of Diogenites: A Study of Fe(2+)-Mg Ordering in Orthopyroxene by X-Ray Single-Crystal Diffraction

Details Cooling Rates of Diogenites: A Study of Fe(2+)-Mg Ordering in Orthopyroxene by X-Ray Single-Crystal Diffraction Cooling Rates of Diogenites: A Study of Fe(2+)-Mg Ordering in Orthopyroxene by X-Ray Single-Crystal Diffraction

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...42z&link_type=abstract

Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 42

Computer Science

Achondrites, Asteroids, Chromites, Cooling, Meteoritic Composition, Pyroxenes, Vesta Asteroid, Volcanology, Crystal Growth, Feldspars, Olivine, Phosphates, X Ray Diffraction, Crystallography

Scientific paper

Diogenites are either breccias or recrystallized breccias consisting almost entirely of orthopyroxene, sometimes with minor olivine and chromite and traces of silica, plagioclase, troilite, metal, and phosphates. A remarkable feature is the very homogeneous major-element composition of diogenite orthopyroxenes. Diogenites, together with howardites and eucrites, are assumed to come from a single parent body (HED), probably asteroid 4 Vesta, that consists of a diogenitic mantle and an eucritic crust whose thickness has been estimated to be not less than 10 km The purpose of this work was to use single-crystal X-ray diffraction (XRD) and kinetic analysis of Fe2 +- Mg ordering in orthopyroxene to obtain additional information on the thermal history of the HED parent body. The ordering of Fe2+ and Mg between the two crystallographic M1 and M2 sites is temperature, time, and composition dependent and provides a means of determining cooling rates.

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