Science

Where is Granulite found?

By: Neeraj DhekaleUpdated: July 02, 2020

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A strange phenomenon first described from south India and Sri Lanka, where in acid to intermediate rocks granulite-facies assemblages (charnockite) are found in vein-like arrays superimposed over amphibolite-facies gneisses. These features are now known, on a less conspicuous scale, from a number of other terrains.

Also asked, what type of rock is Granulite?

metamorphic rock

Also, is Granulite foliated or Nonfoliated?

Amphibolite: Med-high grade metamorphosed mafics, made up largely of plagioclase and amphibole. Granulite: lack foliation, have large granular equant crystals.

What is the parent rock of Granulite?

Granulite Facies - high grade regional metamorphism. Characterized by pyroxene rich rocks if a mafic parent, quartz and feldspar rich gneisses if a complex siliciclastic sedimentary parent, plus other rocks from other parents.

How is Granulite formed?

Formation. Granulites form at crustal depths, typically during regional metamorphism at high thermal gradients of greater than 30 °C/km. In continental crustal rocks, biotite may break down at high temperatures to form orthopyroxene + potassium feldspar + water, producing a granulite.

Related

Where is Blueschist found?

This is a 'low temperature, high pressure' prograde metamorphic path and is also known as the Franciscan facies series, after the west coast of the United States where these rocks are exposed. Well-exposed blueschists also occur in Greece, Turkey, Japan, New Zealand and New Caledonia.

What is amphibolite made of?

Amphibolite ( /æmˈf?b?la?t/) is a metamorphic rock that contains amphibole, especially the species hornblende and actinolite, as well as plagioclase. Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspar, with little or no quartz.

How are metamorphic facies related to temperatures and pressures?

Metamorphic facies. A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure (See diagram in Figure 1).

Is phyllite a metamorphic rock?

Phyllite is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. It is primarily composed of quartz, sericite mica, and chlorite.

How is greenschist formed?

Greenschist facies, one of the major divisions of the mineral facies classification of metamorphic rocks, the rocks of which formed under the lowest temperature and pressure conditions usually produced by regional metamorphism.

What is Charnockite rock?

rock. Charnockite, any member of a series of metamorphic rocks with variable chemical composition, first described from the state of Tamil Nadu in southern India and named for Job Charnock. The term is often limited to the characteristic orthopyroxene granite of the series.

How is metamorphic rock formed?

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

Where are metamorphic rocks found?

This often occurs deep in the Earth or near magma underground. We often find metamorphic rocks in mountain ranges where high pressures squeezed the rocks together and they piled up to form ranges such as the Himalayas, Alps, and the Rocky Mountains.

What is quartzite used for?

Quartzite is a decorative stone and may be used to cover walls, as roofing tiles, as flooring, and stairsteps. Its use for countertops in kitchens is expanding rapidly. It is harder and more resistant to stains than granite. Crushed quartzite is sometimes used in road construction.

What is a gabbro rock?

Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust.

What are the best known Amphiboles?

Numerous common amphiboles can be represented within the Mg7Si8O22(OH)2 (magnesio-anthophyllite)–Fe7Si8O22(OH)2 (grunerite)–“Ca7Si8O22(OH)2” (hypothetical pure calcium amphibole) compositional field (Figure 1). This diagram is commonly referred to as the amphibole quadrilateral.

What is Marble Rock?

Marble is a metamorphic rock formed when limestone is exposed to high temperatures and pressures. Marble forms under such conditions because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals.