Re-examination of Water Solubility in Albite Melt
by Isoji Miyagi
ABSTRACT
Most of the previously determined water solubilities in
silicate melts are overestimated because of an experimental
quenching problem. Hydration of run product glass with
coexisting aqueous bubbles causes the overestimation. Due
to relatively slow quenching rate in conventional IHPVs,
hydration of the glass by trapped aqueous bubbles
inevitably takes place at a significant speed even at low
temperatures (e.g., 70 Ž¡C, 2000 bar). In this paper, a new
method for the solubility determination is proposed by
which the hydration problem can be avoided. Using a new
IHPV with rapid quenching device and utilizing intensive
mapping analysis of water for the experimental charges with
SIMS, solubility of water was newly determined for albite
melt at 2000 bar. The solubility obtained was 10 ~ 30 %
lower than those previously reported. Because the water
solubility data for albite melt have been used as standard
reference in silicate melt literatures, the present
observation has pivotal importance.