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From plagioclase to Maskyelynite via shock

 
: Fritz, J.; Greshake, A.; Fernandes, V.A.; Holzwarth, A.

Meteoritics & planetary science 49 (2014), Supplement 1, Abstract A126
ISSN: 1086-9379
ISSN: 0026-1114
Meteoritical Society (Annual Meeting) <77, 2014, Casablanca>
Englisch
Abstract
Fraunhofer EMI ()

Abstract
Diaplectic glasses of plagioclase (maskelynite) and silica are characterized by the lack of flow structures and vesicles. These glasses retain the original grain boundaries and chemical zonation of the original minerals from which they derive via shock. Diaplectic glasses have lower densities (refractive indices) than the crystalline precursors, and higher densities compared to thermally quenched glasses of isochemical composition. Different formation mechanisms of diaplectic glasses are proposed including 1) solid-state transformation without melting or 2) a combination of shock melting and subsequent quenching at high confining pressure.

: http://publica.fraunhofer.de/dokumente/N-383309.html