Davies, Nature, 1999. Hydrofrac Model. Temperature dependent rheology. Model with temperature dependent rheology, example here would ‘eat’ all the way to the surface.
Model with temperature dependent rheology, example here would ‘eat’ all the way to the surface.
Possible to get freezing out –see Kincaid and Sacks. We know we get magmas therefore I prefer hot end-point => need means to stop eating all the way to surface. Possibly lithosphere in wedge corner is crust (i.e. buyoancy not rheology keeps things near surface)
Model a little time later – not steady-state
Water reacts with mantle – Davies (1994) Davies and Stevenson (1992)
Water reacts with largely dry peridotite
Path of water in hydrated mineral
Water enters wedge
Water flow as free phase
Mantle largely dry
Flow of mantle
Equilibrium, 130Ma, 6cm/yr
Equilibrium, 10Ma, 6cm/yr
Disequilibrium, 130Ma, 6cm/yr
105h (km) – constant along arc segments, but different from segment to segment – England, Engdahl et al. (unpublished)
Non-unique but a 3D constraint
Combine with 3D reflection seismics?
Tatsumi et al., 1983
High Alumina Basalt + 1.5% water