Exempel på mafic

• During this stage, the mafic minerals grow faster than plagioclase, exhausting the local melt in mafic components.

• Small amounts of mafic and opaque minerals occur.

• On the basis of our combined data, a more appealing model for the mafic-ultramafic complexes is the emplacement of solitary intrusions.

• 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.

• 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 particular, the heat for the melting may have been supplied by mafic mantle-derived magmas.

• In weakly deformed gneiss, the mafic minerals (biotite, augite and hornblende) occur as irregular clusters, locally separated from plagioclase by coronas of garnet.

• The mafic magmas were probably derived from the upper mantle (spinel stability field) by 9 % partial melting.

• Sampling was limited to the chromitite layers and laminae that occur in the mafic-ultramafic cumulates of these complexes.

• The thrust truncates a number of vertical mafic layers in the footwall block.

• It is obvious that the compositions of mafic- ultramafic complexes like these have been greatly influenced by cumulate processes.

• In general, eclogites are predominantly mafic and are preserved as boudins within felsic gneisses.

• The formation is vertically zoned with the appearance of banded and mafic pumices approximately 8 cm above the base of the ignimbrite.

• The mafic shells do not show up clearly due to weathering.

• Amphiboles from the core, the inner and outer mafic shells and the matrix were analysed.