Channel flow in collisional orogens
Channel flow and extrusion of hot crust, firstly recognized in southern Tibet and Himalaya becomes a popular concept explaining exhumation of partially molten rocks along frontal parts of large hot orogens. This concept was recently proposed to operate along eastern margin of the Bohemian Massif where wide zone of migmatized horizontally foliated crust enclosing exotic blocks occurs. The channel flow zone propagates far into orogenic root interior where it separates orogenic infrastructure from low grade superstructure. The thermodynamic characterization, modelling of channel flow dynamics and time scales of channel are currently studied by our group both in Tibet, Himalaya and European Variscan belt (e.g. Finch et al., 2014; Schulmann et al., 2014).