Origin of an A-type granite: experimental constraints.

Abstract

The metaluminous Watergums granite, from a bimodal association of A-type granite/rhyolite with basalt in SE Australia, has been experimentally studied so that constraints can be placed on its origin. Petrological, geochemical and experimental data support an origin by direct, high-T partial melting of a melt-depleted I-type source rock in the lower crust.-J.A.Z.