CONSTRAINTS ON RATES OF GRANITIC MAGMA TRANSPORT FROM EPIDOTE DISSOLUTION KINETICS

Epidote is stable only at high pressure in granitic magmas but is foun d in magmas crystallized at shallow crustal levels. This observation s uggests qualitatively that magma transport is sufficiently rapid to pr event complete epidote resorption. Experimental measurements of epidot e dissolution showed that the presence of epidote implies that magma t ransport from the deep crust in these systems was rapid and that the t ransport was by dikes rather than diapirs.