Olivine-bearing and other Basic Hornfelses around the Insch Igneous Mass, Aberdeenshire

Abstract

Basic hornfelses occurring at the contact of slates and olivinenorite are ascribed to influx of Ca, Mg, Fe, Ti, Mn, and P from the gabbro magma into the sedimentary rocks. This kind of basic front, unlike those postulated for acid bodies, has a basic back.