Mathematics – Logic
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esrv...32..107t&link_type=abstract
Earth Science Reviews, Volume 32, Issue 1-2, p. 107-121.
Mathematics
Logic
4
Scientific paper
Minute amounts of free fluids contained along grain boundaries or in fluid inclusions in the rocks of the lower continental crust, mostly remain trapped until dislodged by thermally-induced hydrofracturing, deformation, or tectonic uplift. Volatile-components of minerals in the lower continental crust, are released at rates depending upon the changes in metamorphic heat-supply during tectonic processes, and at depths depending upon appropriate petrogenetic grids at near lithostatic pressure (Pfluid ˜ Prock). Pervasive flow of metamorphic fluid does not result in significant heat advection nor metasomatic mass-transfer. Layers of different permeability, strength and fertility (in the sense of amounts of metamorphic fluid released from minerals), control the local metamorphic hydrology. Only by focussing fluid-flow, by at least 103, can heat and mass advection become significant. The most favourable geological mechanisms to focus fluid-flow seem to be the reactivation of inherited heterogeneiities such as lithological contacts, old faults and shear zones, close to a deep-crustal aquitard or a fertile layer.
Connolly James A. D.
Thompson Alan Bruce
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