This characteristic also inhibits development of pronounced vertical zonation of the magma body.
Crustally-contaminated andesites could be produced by combined assimilation and fractional crystallization of basaltic magmas.
Second, differentiation, mixing, assimilation of magmas and alteration can produce compositional trends that can cross field boundaries within discrimination diagrams.
These constituents are formed rapidly from cooled droplets of magma that take on dynamic shape during transport.
Even if such a magma chamber extended through the entire crust, its height/diameter ratio would still be less than one.
It is therefore likely that generation of the widespread intermediate-silicic magmas represents an early stage in the formation of continental crust.
Constraints on melting and magma production in the crust.
The rise of felsic magma to a high level in the crust without degassing or neutralization of the melt volatile phase suggests deep faulting.
