Foliation (geology) - Wikipedia
Foliation is common in rocks affected by the regional metamorphic compression typical of areas of mountain belt formation (orogenic belts). More technically, foliation is any penetrative planar fabric present in metamorphic rocks.
Metamorphic Rocks – Formation, Types, Examples - Science …
2024年2月24日 · Metamorphic rocks start out as other rocks that undergo physical and chemical changes due to extreme conditions deep in the Earth’s crust. Metamorphic rocks represent one of the three major classes of rocks, the others being igneous and sedimentary.
Metamorphic Rocks | Pictures of Foliated and Non-Foliated Types
Foliated metamorphic rocks have a layered or banded appearance that is produced by exposure to heat and directed pressure. Examples of foliated rocks include: gneiss , phyllite , schist , and slate
Foliation | Types, Causes, & Facts | Britannica
Foliation, planar arrangement of structural or textural features in any rock type but particularly that resulting from the alignment of constituent mineral grains of a metamorphic rock of the regional variety along straight or wavy planes.
Overview of Metamorphic Rocks – Laboratory Manual for Earth …
Metamorphic rocks with a foliation pattern defined by the layering of platy minerals (such as muscovite or biotite micas) are called schist. The rock name is commonly modified to indicate what mica is present. For example, Figure 5.5 is muscovite schist with garnet present, so the correct name for this rock is a garnet muscovite schist.
6.3: Metamorphic Textures - Geosciences LibreTexts
Foliated metamorphic rocks are named based on the style of their foliations. Each rock name has a specific texture that defines and distinguishes it, with their descriptions listed below.
Metamorphic rock | Definition, Formation, & Facts | Britannica
2024年10月7日 · Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components.
10.2: Foliation and Rock Cleavage - Geosciences LibreTexts
2024年8月22日 · Foliation Controls How Rocks Break. Foliated metamorphic rocks have elongated crystals that are oriented in a preferred direction. This forms planes of weakness, and when these rocks break, they tend to break along surfaces that parallel the orientation of the aligned minerals (Figure 10.10).
7.2: Classification of Metamorphic Rocks - Geosciences LibreTexts
2024年4月24日 · Metamorphic rocks that form under either low-pressure conditions or just confining pressure do not become foliated. In most cases, this is because they are not buried deeply, and the heat for the metamorphism comes from a body of magma that has moved into the upper part of the crust.
Metamorphic rock - Foliated, Textures, Minerals | Britannica
2024年10月7日 · The various mineral phases of a metamorphic rock have different physical properties and symmetries. When a rock is subjected to recrystallization in a stress field, different substances will behave differently according to such physical properties and symmetries.