What is contact metamorphism the result of?
Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma.
What is contact metamorphism?
Contact Metamorphism (often called thermal metamorphism) happens when rock is heated up by an intrusion of hot magma. In this photo, the dark grey rock is an intrusion (a sill) between layers of a paler grey limestone. Just above and below the intrusion, the limestone has been altered to form white marble.
Where can contact metamorphism be found?
Contact metamorphism is usually restricted to relatively shallow depths (low pressure) in the Earth because it is only at shallow depths where there will be a large contrast in temperature between the intruding magma and the surrounding country rock.
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.
What is contact metamorphism short answer?
Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. This is an easy name to recall if you remember that these rocks change by actually coming in contact with something very hot, like magma.
What is an example of contact metamorphism?
An example of contact metamorphism is limestone surrounding a magma chamber being turned into marble. This process happens because marble is a more stable form of rock in the magma intrusion’s high heat area.
What is metamorphism quizlet?
Metamorphism. Metamorphism is the transformation. of preexisting rock into texturally or. mineralogically distinct new rock as a result of high temperature, high pressure, or both..but without the rock melting in the process.
How is contact metamorphism different from regional metamorphism quizlet?
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.
Which metamorphic feature is associated with contact metamorphism?
Hornfels is another non-foliated metamorphic rock that normally forms during contact metamorphism of fine-grained rocks like mudstone or volcanic rock (Figure 7.13). In some cases, hornfels has visible crystals of minerals like biotite or andalusite.
What causes metamorphism quizlet?
Contact metamorphism is caused by heat from a magmatic intrusion. Rocks located close to the intrusion of magma will be highly metamorphosed.
How does contact metamorphism differ from regional metamorphism?
What is the main factor that causes 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 is contact metamorphism and how does it occur?
Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma. In the classic case, an igneous intrusive body such as a granite intrudes a sequence of sedimentary or metamorphic rocks and produces a contact aureole consisting of several temperature-specific mineral assemblages.
How does contact metamorphism affect the size of aureoles?
Contact metamorphism is greater adjacent to the intrusion and dissipates with distance from the contact. The size of the aureole depends on the heat of the intrusion, its size, and the temperature difference with the wall rocks.
How do we determine the processes underlying metamorphism?
To determine the processes underlying metamorphism, they rely heavily on statistical mechanics and experimental petrology . Three types of metamorphism exist: contact, dynamic, and regional. Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism.
Where does metamorphism occur in the Earth?
It most often refers to dynamothermal metamorphism, which takes place in orogenic belts (regions where mountain building is taking place), but also includes burial metamorphism, which results simply from rock being buried to great depths below the Earth’s surface in a subsiding basin.