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When do dikes form sills and magma chambers?

Posted on 02/12/2011

In his Tectonophysics paper Agust Gudmundsson proposed three mechanisms whereby propagating magmatic dikes can form sills and potentially magma chambers.  These include (a) dyke-induced tensile stress operating at shallow depths, (b) stress barriers causing dikes to terminate or form sills, and (c) elastic mismatch which would cause the dike to deflected into the contact forming a sill.  He argues that the stresses from ice loading would have encouraged the development of shallow magma chambers fed by a lower crustal dike system.  



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