COG3 Seminar – Luca Caricchi (University of Geneva)
Why magma stall in the Earth’s crust?
The emplacement depth of magmas plays a key role in determining the chemical stratification of the crust, and on the probability of magma to reach the surface to
feed volcanic eruptions. While mechanical discontinuities within the crust have been shown to lead to the arrest of propagating dykes, in a section of a volcanic island arc in Kohistan, the depth of emplacement of granitoids does not seem to correspond to any particular mechanical discontinuity. I will focus on the evolution of crystallinity and temperature as function of magma chemistry and depth to show how magma chemistry can strongly affect the depth at which magma stall in the crust to form magma reservoirs.