Magnetic fabrics and compositional evidence for the construction of the Caleu pluton by multiple injections, Coastal Range of central Chile

The distinct compositional characteristics of these three zones were not acquired in situ. Rather they were emplaced successively from mafic to felsic from a subjacent stratified sill-like magma reservoir, which was filled after tilting of the host volcanic succession. The rapid upward transport of these melts of different compositions up to a shallow depth is attested by both the equilibration pressure of late magmatic hornblende (∼200 MPa) and the pressure of early magmatic epidote crystallization (∼500-600 MPa). We conclude that space was created by lateral flow propagation, in which the intrusion of later pulses pushed earlier ones away from the feeder system, followed by roof lifting and possibly floor depression.