0 used to refer to rocks containing more light-coloured substances and aluminium than other rocks
1 describes rocks containing more light-colored substances and aluminum than other rocks
Crystallization proceeded to approximately the same stage in all orbicules, when the felsic shell started to form.
This is in agreement with return to more mafic detritus and the proposed increased upper continental crust contribution, together at the expense of felsic detritus.
The rise of felsic magma to a high level in the crust without degassing or neutralization of the melt volatile phase suggests deep faulting.
In continental rift settings, the emplacement of such large volumes of felsic melts requires a huge amount of mafic magma derived from uprising asthenosphere.
In general, eclogites are predominantly mafic and are preserved as boudins within felsic gneisses.
To the south, the meta-gabbro is bounded by felsic gneiss.
There is a continuum apparent between the amphibolites and intermediate gneisses, whilst the felsic gneisses form a separate, high-silica group.
One or two extremely thin (< 0.2 mm) discontinuous mafic shells may occur in the felsic shell.
