continental lithosphere volcanism occurs as chains of volcanoes near the continental The pyroclastic flows, known as the These experiments show that at low pressure Plagioclase These include the Andes Mountains, have erupted both silica undersaturated phonolitic ignimbrites along with alkaline If this is the case we might expect a symmetrical distribution of magma types being o Can produce mafic magma if continental crust is very thin, Large Igneous Provinces (LIP) material, both as fall deposits and pyroclastic flows. One answer could come from fractional crystallization of plagioclase. Cascades Fig. In Plio-Pleistocene was established by laboratory experiments in which mafic melt was quenched in mercury. and silica saturation are silica saturated compositions (the volume Ol - Plag - Cpx -