Which of the following best describes the contact metamorphism conditions?
Which of the following best describes the conditions of contact metamorphism? Pressures are fairly low, the rock is in the upper part of the crust, and the heat is supplied from a nearby magma body.
What is another name for contact metamorphism?
Contact Metamorphism (often called thermal metamorphism) happens when rock is heated up by an intrusion of hot magma.
How do you describe contact metamorphism?
Contact metamorphism occurs due to heating, with or without burial, of rocks that lie close to a magma intrusion. It is characterized by low P/T gradients, as strong thermal gradients between an intruding magma and adjacent country rock are best established at shallow crustal levels.
What are the three zones of metamorphism?
The main lithologies are ultramafic, mafic, felsic (or quartzo-feldspathic), pelitic and calcareous.
What is contact metamorphism quizlet?
Contact metamorphism occurs when the country rock is affected by heat from an intrusion. Igneous bodies are intrude at relatively shallow depth so contact metamorphism is described as high temperature, low pressure metamorphism. High temperatures lead to recrystallised, unfoliated rocks in an aureole. Metamorphic Grade.
Why are intrusive igneous rocks associated with contact metamorphism?
Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole.
Where does contact metamorphism occur?
Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma.
Which rock can form in a contact metamorphic zone?
Contact metamorphism produces non-foliated (rocks without any cleavage) rocks such as marble, quartzite, and hornfels.
What are the types of metamorphic zones?
The sequence of zones now recognized, and the typical metamorphic mineral assemblage in each, are:
- Chlorite zone. Pelitic rocks are slates or phyllites and typically contain chlorite, muscovite, quartz and albite.
- Biotite zone. …
- Garnet zone. …
- Staurolite zone. …
- Kyanite zone. …
- Sillimanite zone.
What is regional metamorphism and contact metamorphism?
Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. Regional metamorphism is a type of metamorphism where rock minerals and texture are changed by heat and pressure over a wide area or region.
What is a contact aureole?
The area surrounding an igneous intrusion that has been metamorphosed as a result of the heat released by the magma is called a contact aureole.
What is a contact aureole quizlet?
– A small area around the intrusion is heated and metamorphism is restricted to this zone. – This zone is called a contact aureole. – Rocks outside of the aureole are not affected by the intrusion. – The grade increases in all direction toward the intrusion.
What type of metamorphism is caused by igneous intrusions?
Contact metamorphism Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole.
Which metamorphic rock is only formed from contact metamorphism?
Contact metamorphism produces non-foliated (rocks without any cleavage) rocks such as marble, quartzite, and hornfels.
What is metamorphic aureole?
An area of rock altered in composition, structure, or texture by contact with an igneous intrusion.
Which type of metamorphism forms a baked zone or contact aureole?
Rocks formed by thermal metamorphism usually form an aureole or baked margin around intrusions of magma.
Which kind of metamorphism occurs next to an intrusion of molten magma?
Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole.
What is contact and regional metamorphism?
Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. Regional metamorphism is a type of metamorphism where rock minerals and texture are changed by heat and pressure over a wide area or region.