Some chemical data on members of the shoshonite association

Abstract

Summary: A number of minerals and residual glasses from absarokites, shoshonites, and latites have been analysed by electron probe. Clinopyroxenes show very little iron-enrichment and these rocks are thus distinguished from tholeiites and alkali basalts. Glasses from this group are also distinct from tholeiites and alkali basalts and occupy a separate field on a CaO-Na₂O-K₂O diagram.