Phase relations in the system KAlSi3O8 NaAlSi3O8 at high pressure high temperature conditions and their implication for the petrogenesis of lingunite

Details Phase relations in the system KAlSi3O8 NaAlSi3O8 at high pressure high temperature conditions and their implication for the petrogenesis of lingunite Phase relations in the system KAlSi3O8 NaAlSi3O8 at high pressure high temperature conditions and their implication for the petrogenesis of lingunite

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.246..317l&link_type=abstract

Earth and Planetary Science Letters, Volume 246, Issue 3-4, p. 317-325.

Computer Science

7

Scientific paper

Multi-anvil experiments have been made with the composition (K0.2Na0.8)AlSi3O8 at 14 25 GPa and 1400 2400 °C. These experiments suggest that at subsolidus conditions the stable phase assemblages are hollandite-I + jadeite + stishovite (at pressures up to ˜20 GPa), hollandite-II + jadeite + stishovite (at pressures between ˜ 20 and ˜ 24 GPa), and hollandite-II + calcium ferrite-type NaAlSiO4 + stishovite (at pressures > ˜ 24 GPa), where hollandite-I and hollandite-II are distinguished by their chemical compositions and phase diagram topology. The maximum NaAlSi3O8 in hollandite occurs at ˜ 22 GPa, and its fraction is positively correlated to temperature, attaining a value of ˜ 51 mol% at 2200 °C. At supersolidus conditions the solidus and liquidus phases around 14 GPa are hollandite-I and jadeite, respectively; at ˜ 22 GPa, however, the solidus phase is jadeite while the liquidus phase is either stishovite or hollandite-II with a very low fraction of NaAlSi3O8. These experimental results therefore suggest that lingunite with the hollandite structure and ˜ 90 mol% NaAlSi3O8, found in some meteorites, is a disequilibrium product. It is similarly proposed that the phase with the structure of jadeite but the composition of plagioclase, found along with lingunite, is also a disequilibrium phase.

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