Water solubility mechanisms in KAlSi 3 O 8 melts at high pressure

Details Water solubility mechanisms in KAlSi 3 O 8 melts at high pressure Water solubility mechanisms in KAlSi 3 O 8 melts at high pressure

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3575s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 15, pp.3575-3584

Computer Science

1

Scientific paper

27 A1, 29 Si MAS NMR, Raman and IR spectroscopic techniques were employed to investigate water solubility mechanisms in KAlSi 3 O 8 melt. Anhydrous glasses were produced by isobarically quenching melts at 0.1 MPa and 2 GPa. Hydrous glasses with 2.5 wt% [H 2 O] tot were quenched isobarically from 5 and 7 GPa. Hydrous glasses with 2.5, 5.0 and 7.5 wt% [H 2 O] tot were quenched isobarically at 2 GPa. A peak near 900 cm -1 appears in the Raman and IR spectra of all hydrous KAlSi 3 O 8 glasses. The intensity of the 900 cm -1 peak relative to the intensity of the high-frequency envelopes remains constant for all of the hydrous 2 GPa glasses. The intensity of the 900 cm -1 peak decreases with pressure at constant [H 2 O] tot . The 27 Al resonance is at more positive parts per million in the hydrous 2 GPa glasses relative to the anhydrous 2 GPa sample. Hydrous glasses have narrower linewidths than the 1 atm and 2 GPa anhydrous glasses. We suggest that this spectroscopic information indicates two stages to the water dissolution mechanism. In the initial stage, we propose that water interacts with the aluminosilicate network to form Al-(OH) terminal bonds. At higher water contents (>25-30 mol% [H 2 O] tot ), the solubility mechanism occurs solely by the exchange of H + for M + (M = Na, K, Li) and the formation of partial hydration complexes around the alkali cation.

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