metamorphic facies

Every metamorphic facies has some index minerals by which it can be recognized.

The different metamorphic facies are defined by the mineralogical composition of a rock.

It is an indicator mineral of the prehnite-pumpellyite metamorphic facies.

Garnets are also useful in defining metamorphic facies of rocks.

Metamorphic facies are defined by the pressure-temperature fields in which particular minerals form.

Due to their deep penetration, shear zones are found in all metamorphic facies.

A more complete indication of this intensity or degree is provided with the concept of metamorphic facies.

Metamorphic rock naming can be based on texture, protolith, metamorphic facies, and/or the locations in which they are found.

A metamorphic facies is a set of metamorphic mineral assemblages that were formed under similar pressures and temperatures.

The zeolite facies is the metamorphic facies with the lowest metamorphic grade.

Phyllites are said to have a "phyllitic texture" and are usually classified as having a low grade in the regional metamorphic facies.

Another metamorphic facies series is the Buchan series, that sees a fast increase in temperature but a relatively small increase in pressure.

Eclogite is the highest pressure metamorphic facies and is usually the result of advancement from blueschist metamorphic conditions.

Pentti Eelis Eskola (1883-1964) was a Finnish geologist who developed the concept of metamorphic facies.

Therefore a meta psammite and a meta pelite will have different mineralogical compositions even though they were in the same metamorphic facies.

Regional metamorphism can be described and classified into metamorphic facies or metamorphic zones of temperature/pressure conditions throughout the orogenic terrane.

Eclogitization is the tectonic process in which the appearance of high-pressure, metamorphic facies, eclogite leads to an increase in crustal densities.

The metamorphic facies, which is described as lower to upper amphibolite facies, implies a moderate to high metamorphic temperature and a moderate pressure.

Various metamorphic facies are named after the mineral assemblages and rock types formed by subjecting basalts to the temperatures and pressures of the metamorphic event.

Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies).

Analogous with these sedimentary facies a number of metamorphic facies were proposed in 1920 by Finnish petrologist Pentti Eskola.

The prehnite-pumpellyite facies is a metamorphic facies typical of subseafloor alteration of the oceanic crust around mid-ocean ridge spreading centres.

It occurs metamorphic rocks of the greenschist to amphibolite metamorphic facies and in low-temperature hydrothermal veins in altered volcanic rocks.

Metamorphic facies are recognizable terranes or zones with an assemblage of key minerals that were in equilibrium under specific range of temperature and pressure during a metamorphic event.

Later the underlying principles of metamorphic zones were clarified by the Finnish geologist Pentti Eskola, who introduced the concept of metamorphic facies.