Convection in Aid of Adcumulus Growth

Publisher Website
Google Scholar
Abstract
Sheet cooling occurs for most large magma bodies emplaced into the earth's crust The convection that ensues is driven by the stove effect of the feeder, by cooling principally at the roof, and to an important degree by two-phase flow of crystal-liquid suspensions accelerated by rapid crystal growth upon compression. Significant floor cooling through the cumulate substrate is limited to the early history of an intrusion. Thereafter a thermal maximum in the T-Z profile (a latent-heat hump) always occurs at the cumulus interface. If crystals grow, the latent heat is carried away chiefly by the magma. The solute rejected by the growing interface is buoyant for mafic and ultramafic cumulates but dense for all felsic and feldspar-cotectic cumulates not containing cumulus iron oxide minerals. The rejected solute (RS) is light for calc-alkaline cumulates in general, a fact probably germane to the origin of rhyolite by sidewall crystallization.

This publication has 0 references indexed in Scilit: