0 a type of metamorphic rock that contains light and dark layers formed of minerals such as quartz and mica
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.
中文繁体
片麻岩(由雲母、石英組成,中粗粒變晶結構和片麻狀或條帶狀構造的變質岩)…
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片麻岩(由长石﹑石英组成﹐中粗粒变晶结构和片麻状或条带状构造的变质岩)…
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gnaisse…
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gnejs…
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