Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 369, Issue -, Pages 317-332Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2013.03.041
Keywords
magma; degassing; rehydration; diffusion; water; modeling
Categories
Funding
- NSF [EAR-1019872, IDR-1015069]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1015069] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1019872] Funding Source: National Science Foundation
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The matrix-glass water concentrations in samples from volcanic eruptions of intermediate to highly silicic magmas were measured and compiled. They range from 0.1 wt% to more than 3.5 wt% and show a positive correlation with vesicles surface area over glass volume ratio. Modeling of water diffusion suggests that most of this correlation can be explained by the post-eruptive diffusion of external water at atmospheric temperature and pressure into the matrix-glass, a process referred to as rehydration. Although the precise proportion of primary (magmatic) to secondary (meteoric) water is not determined by our analysis, we find that most samples can be modeled by progressive rehydration of an initially 'dry' sample during the time interval between deposition and sample collection at an average rehydration diffusivity of approximately 10(-23) m(2) s(-1). This diffusivity estimate is consistent with values provided in the literature on obsidian hydration dating and with the extrapolation of diffusivity formulations for silicic melts to lower temperatures and pressures. Published by Elsevier B.V.
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