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- W2050922823 abstract "A (Ca,Na)-hexaluminosilicate, whose Ca end member was previously synthesized in numerous high-pressure experiments, has been identified by Raman spectroscopy in heavily shocked Martian meteorites. This mineral has a structural formula close to (CaxNa1−x)Al3+xSi3−xO11 and is similar to the calcium aluminum silicate phase previously synthesized in high-pressure experiments performed on anorthite and rocks of basaltic composition. This new mineral occurs in shock melt pockets in two distinct settings and is intimately intergrown with SiO2-stishovite. The first setting, encountered in Zagami, consists of idiomorphic equant crystals overgrown by acicular stishovite that crystallized from a melt of labradorite composition. The second setting contains the (Na,Ca)-hexaluminosilicate phase intergrown with stishovite and hollandite and was formed during partial melting at high pressures. The mineralogical association (Na,Ca)-hexaluminosilicate+stishovite was observed in shock melt pockets, which have distinct bulk compositions in seven Martian shergottites. This new mineral represents, after majorite, the second natural occurrence of a silicate mineral with silicon in both four and six coordination. The assemblage stishovite+(Na,Ca)-hexaluminosilicate sets constraints on the pressure and temperature conditions that prevailed during shock in some of the studied meteorites. The (Na,Ca)-hexaluminosilicate mineral is a potential carrier of Al and Na during subduction of oceanic crust in the lower mantle of the Earth." @default.
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- W2050922823 date "2004-02-01" @default.
- W2050922823 modified "2023-09-25" @default.
- W2050922823 title "A new natural high-pressure (Na,Ca)-hexaluminosilicate [(CaxNa1−x)Al3+xSi3−xO11] in shocked Martian meteorites" @default.
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- W2050922823 doi "https://doi.org/10.1016/s0012-821x(03)00695-2" @default.
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