Proposed to explain the juxtaposition of two distinctly different 'liquid' compositions with no intervening, intermediate composition.
e.g. globular masses of granitic composition in a basaltic matrix.
Varioles, spherulres ===> variolitic, spherilitic
This process has been in and out of favour with petrologists for the past century.
Liquid immiscibility has been proposed to have played a role in the formation, by fractionation, of:
In all of the above ==> basalt host with 'granitic' globules or varioles.
Immiscibility has also been proposed and or observed for alkali intrusions, which may have two silicate liquids or a silicate and carbonate liquid, and mafic intrusions, which may have silicate and sulphide liquids.