Mathematics – Logic
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..260m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 105, no. 1-3, July 1991, p. 260-265. Research supported by Ministero
Mathematics
Logic
22
Geochemistry, Iron Compounds, Metamorphism (Geology), Meteoritic Composition, Pyroxenes, Crystal Structure, Magnesium Compounds, Order-Disorder Transformations
Scientific paper
The present study investigates equilibrium reversals of Fe(2+)-Mg distribution between the M1 and M2 sites of an orthopyroxene from the Johnstown meteorite that were achieved at several temperatures between 700 and 1000C. One single crystal was used for the whole thermal treatment and for collecting all the X-ray data after quenching. A TEM study of part of the crystal showed the presence of very thin auguite lamellae and Guinier-Preston zones indicating a relatively rapid cooling of the host rock at temperatures close to 1000C. The new temperature scale yields a relatively high quenching temperature of 379 C + or - 8 C for the pyroxene, which is consistent with the rapid cooling (estimated at a few degrees per 100 yr) of a magmatic cumulate excavated by the impact on its parental body.
Brizi E.
Molin Mario G.
Saxena Surendra K.
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