Physics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3504306r&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 4, CiteID L04306
Physics
17
Volcanology: Physics And Chemistry Of Magma Bodies, Volcanology: Volcanic Gases, Geodesy And Gravity: General Or Miscellaneous (1709), Geochemistry: Magma Chamber Processes (3618)
Scientific paper
Dike intrusions are often accompanied by localized deflation, interpreted as depressurizing magma chambers feeding the dike. In some cases the inferred volume decrease is a factor of 4 or 5 less than the volume increase of the dike. Here we explore whether this discrepancy can be explained by compressibility of the magma combined with the fact that cracks are much more compliant than equidimensional magma chambers. If pressure changes are small, the magma compressibility β m is constant, and the dike ends up in hydrostatic equilibrium with an ellipsoidal magma chamber at the same depth, the ratio r V of the volume of the crack to the volume lost by the chamber is r V = 1 + 4μβ m /3 > 1, where μ is the host rock rigidity. For gas poor magmas, β m = 0.6-2 . 10-10 Pa-1 and μ = 3-25 GPa, we find 1.2 < r V < 7.7. Large changes in magma compressibility due to gas exsolution increase r V .
Rivalta Eleonora
Segall Paul
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