Voorbeelden van gneiss

• Here we describe the colonization of heavily shocked gneiss by heterotrophic bacteria in a natural setting.

• The country rock was typically coarse crystalline granite gneiss, strongly weathered, ventifacted, and partly polished, and outcrops were 'crumbled' and without strength.

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

• Samples from the normal smooth surface of the gneiss boulder show that the surface has been ground and polished during glacial transportation.

• These gneisses have been multiply deformed at granulite-facies conditions.

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

• These pass up into a 150 m thick homogeneous granite that is bound by planar surfaces parallel to the foliation in the underlying gneiss.

• The kinematic evidence is interpreted to mean that the contact between the gneiss and the biotite schist has a normal-shear (hangingwall down) geometry.