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Zaoyang chondrite cooling history from Fe2+-Mg intracrystalline ordering in pyroxenes

Published online by Cambridge University Press:  05 July 2018

Gian Mario Molin ,
Mario Tribaudino  and
Elisabetta Brizi
Gian Mario Molin
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, I-35100 Padova, Italy
Mario Tribaudino
Affiliation:
Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 37, I-10125 Torino, Italy
Elisabetta Brizi
Affiliation:
Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università, I-06100 Perugia, Italy
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Abstract

The crystal chemistry of clinopyroxene, orthopyroxene and olivine from a crushed fragment of the H5 Zaoyang chondrite has been investigated by X-ray structure refinement and detailed microprobe analysis. The meteoritic pyroxenes have cell and polyhedral volumes which compare well with such data from terrestrial pyroxenes that typically crystallize at low-pressure. Fe2+ and Mg are rather disordered in M1 and M2 sites of clino- and orthopyroxenes; the closure temperatures of the exchange reaction are 600 and 512°C respectively, which is consistent with a reasonably fast cooling rate, estimated to be of the order of 1°C/day.

The closure temperature for the intercrystalline Ca-Mg exchange reaction for clino- and orthopyroxenes is 900°C as calculated from clino- and orthopyroxene intergrowth.

The cooling rates obtained from Fe2+-Mg intracrystalline partitioning suggest a cooling of the order of degrees per day at temperatures of 600–500°C due to a strong loss of heat by irradiation.

Keywords

chondritepyroxenecrystal-chemistrycooling rate
Type
Extraterrestrial Material
Information
Mineralogical Magazine , Volume 58 , Issue 390 , March 1994 , pp. 143 - 150
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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