Re-examination of Water Solubility in Albite Melt

Isoji Miyagi
Proc. Japan Acad.
Vol. 71, 121-125 (1995)

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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 (I!(BC, 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.