Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..257r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 4, p. 257-260.
Physics
18
Magma, Rock Intrusions, Temperature Effects, Basalt, Freezing, Granite, Rhyolite
Scientific paper
A self-similar solution for a dike propagating down a temperature gradient when the wallrock and magma temperatures are equal at the chamber wall is described, which applies only to a special case of a single-component magma intruded at the solidus temperature. A single dimensionless parameter beta is introduced to determine the dike propagation velocity, relative to that in the absence of freezing. For values of beta below about 0.15, release of latent heat allows dikes to propagate without freezing shut. For larger values of beta freezing constricts the dike faster than propagation widens it. Numerical results show that, for laboratory values of the relevant materials properties, and a temperature gradient at the contact of -1 C/m, basalt dikes given an excess source pressure greater than 2.5 MPa, but rhyolite dikes with a viscosity of 10 exp 1 Pa/s would require a source pressure greater than 25 MPa. It is concluded that if beta is much greater than 0.15 the dike freezes shortly after encountering host rock at temperatures below the magma solidus.
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