The Relations between Ore Veins and Igneous Intrusives

Abstract

Because of the intrusive and eruptive activity of rhyolite, the Tertiary formations in the Ikuno District have a basin-like structure. Many intrusives of various rock types, from acidic to basic, occupied fractures which occurred under stress caused by structural deformation, especially sheets and dikes of basalt controlled the formation of are veins at the Ikuno Mine.