What type of metamorphic facies are associated with subduction of oceanic crust?
For example, regions associated with subduction of oceanic material beneath either oceanic crust or continental crust are characterized by blueschist, greenschist, and eclogite facies rocks, whereas areas thought to reflect continent-continent collision are more typically distinguished by greenschist and amphibolite …
Which two metamorphic facies is most associated with subduction zones?
High-Pressure Metamorphism Blueschist-facies metamorphism is important in subduction zones, where high-pressure, relatively low-temperature mineral assemblages form. Glaucophane and lawsonite, both of which have a bluish color, are common minerals in this setting.
What type of metamorphic rock is associated with subduction zones?
Subduction zone metamorphism is characterized by a low temperature, high-ultrahigh pressure metamorphic path through the zeolite, prehnite-pumpellyite, blueschist, and eclogite facies stability zones of subducted oceanic crust.
What type of plate boundary is associated with Barrovian metamorphism?
convergent tectonic plates
Regional or Barrovian metamorphism covers large areas of continental crust typically associated with mountain ranges, particularly those associated with convergent tectonic plates or the roots of previously eroded mountains.
What is the barrovian sequence?
A sequence of regional metamorphic mineral reactions recorded by the successive mineral assemblages seen in metapelites (metamorphosed or sandy shales) from the Barrovian terrain around Glen Esk in north-eastern Scotland and characteristic of medium regional metamorphic gradients of temperature and pressure.
Is staurolite a metamorphic facies?
The chlorite and biotite zones represent greenschist facies metamorphism, and the garnet, staurolite, kyanite, and sillimanite zones represent amphibolite facies metamorphism. During this stage, much of the metamorphism took place.
What metamorphic facies would most commonly be associated with a subduction zone and why?
What metamorphic facies would most commonly be associated with a subduction zone and why? Subduction zone metamorphism is characterized by a low temperature, high-ultrahigh pressure metamorphic path through the zeolite, prehnite-pumpellyite, blueschist, and eclogite facies stability zones of subducted oceanic crust.
Under what conditions does blueschist facies metamorphism form?
The blueschist metamorphic facies are characterized by the minerals jadeite, glaucophane, epidote, lawsonite, and garnet. They record metamorphism in the cool high-pressure/low-temperature thermal gradients at less than 7°C/km in subduction zones in the last 1 billion years.
How the staurolite is formed during amphibolite facies?
Staurolite is formed by regional metamorphism of rocks, such as mica schists, slates, and gneisses, and generally associated with other minerals like kyanite, garnet, and tourmaline.
What is Barrovian metamorphism?
Barrovian metamorphism takes place during regional metamorphism, caused by crustal thickening in the roots of an orogenic belt (under mountain chains). Barrovian zones are especially easy to recognize in pelitic rocks.
Where does Barrovian metamorphism occur?
Barrovian metamorphism is the most commonly encountered. It occurs in intense tectonic conditions associated with volcanic arcs, and major mountain building. Barrovian metamorphism is widely found across time and space on all parts of the earth, and produces the most common metamorphic rocks.
Under what conditions does Blueschist facies metamorphism form?