FACTORS CONTROLLING PERMEABILITY-POROSITY RELATIONSHIPS IN MAGMA
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dc.contributor.author | Blower J. | |
dc.date.accessioned | 2021-02-13T08:02:35Z | |
dc.date.available | 2021-02-13T08:02:35Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=32199887 | |
dc.identifier.citation | Bulletin of Volcanology, 2001, 63, 7, 497-504 | |
dc.identifier.issn | 0258-8900 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24883 | |
dc.description.abstract | A model has been developed to investigate the sensitivity of magma permeability, k, to various parameters. Power-law relationships between k and porosity φ are revealed, in agreement with previous experimental and theoretical studies. These relationships take the form \(\) \(\hat k = k/r^2 = a(\phi - \phi _{cr} )^b \) where r is the mean bubble radius, φ cr is the percolation threshold below which permeability is zero, and a and b are constants. It is discovered that \(\) \(\hat k - \phi \) relationships are independent of bubble size. The percolation threshold was found to lie at around 30% porosity. Polydisperse bubble-size distributions (BSDs) give permeabilities around an order of magnitude greater than monodisperse distributions at the same porosity. If bubbles are elongated in a preferred direction then permeability in this direction is increased, but, perpendicular to this direction, permeability is unaffected. In crystal-free melts the greatest control on permeability is the ease of bubble coalescence. In viscous magmas, or when the cooling time-scale is short, bubble coalescence is impeded and permeability is much reduced. This last effect can cause variations in permeability of several orders of magnitude. | |
dc.title | FACTORS CONTROLLING PERMEABILITY-POROSITY RELATIONSHIPS IN MAGMA | |
dc.type | Статья |
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