The breakdown of diopside to Ca-rich majorite and glass in a shocked H chondrite

Details The breakdown of diopside to Ca-rich majorite and glass in a shocked H chondrite The breakdown of diopside to Ca-rich majorite and glass in a shocked H chondrite

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.208..271t&link_type=abstract

Earth and Planetary Science Letters, Volume 208, Issue 3-4, p. 271-278.

Computer Science

4

Shock Event, H Chondrite, Diopside, Majorite, Perovskite

Scientific paper

Fine-grained assemblages of majorite and glassy grains are for the first time identified in a shock-induced melt vein in an H chondritic meteorite. The bulk chemical composition of these aggregates is similar to that of diopside CaMgSi2O6 in the host rock. Both majorite and glassy grains are Ca-rich and their formulae can be approximated as (Mg0.65Fe0.09Ca0.26)SiO3 and (Mg0.23Fe0.05Ca0.72)SiO3, respectively. These Ca-rich assemblages are dissociation products of the host diopside and were produced at ~18-24 GPa by a shock event. The CaSiO3-rich glass is inferred to have crystallized in a perovskite structure, but was vitrified during the pressure release.

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