Table of Contents
- 1 What type of metamorphism is due to being near hot magma?
- 2 Which type of metamorphism can occur when magma comes into contact with rock?
- 3 How does contact metamorphism change rocks?
- 4 What are contact metamorphic rocks?
- 5 Which is the best description of contact metamorphism?
- 6 What kind of metamorphic rocks are not foliated?
What type of metamorphism is due to being near hot magma?
Contact metamorphism occurs due to heating, with or without burial, of rocks that lie close to a magma intrusion.
Which type of metamorphism can occur when magma comes into contact with rock?
Contact metamorphism happens when a body of magma intrudes into the upper part of the crust. Heat is important in contact metamorphism, but pressure is not a key factor, so contact metamorphism produces non-foliated metamorphic rocks such as hornfels, marble, and quartzite.
What rock forming process occurs when hot magma comes near and heats up rock?
Metamorphic rocks form when heat and pressure transform an existing rock into a new rock. Contact metamorphism occurs when hot magma transforms rock that it contacts. Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces.
What kind of rocks does metamorphism affect?
Metamorphism. Any type of rock—igneous, sedimentary, or metamorphic—can become a metamorphic rock. All that is needed is enough heat and/or pressure to alter the existing rock’s physical or chemical makeup without melting the rock entirely. Figure 2.
How does contact metamorphism change rocks?
Contact metamorphism occurs when magma intrudes or forces its way into existing rock. The heat of the magma bakes the surrounding rocks causing them to change. Marble is created from limestone that has been subjected to heat. Regional metamorphism by contrast takes place over large areas and is high-grade metamorphism.
What are contact metamorphic rocks?
Contact metamorphic rocks form when rocks are heated to high temperatures, usually through contact with an igneous intrusion at a relatively low pressure. The effects of contact metamorphism usually only extend for a short distance from the cooling igneous rock that is providing the heat.
What type of metamorphism is affected by heat and reactive fluid?
During metamorphism, protolith chemistry is mildly changed by increased temperature (heat), a type of pressure called confining pressure, and/or chemically reactive fluids. Rock texture is changed by heat, confining pressure, and a type of pressure called directed stress.
How does metamorphism take place in a rock?
This type of metamorphism takes place when the very hot magma moves up through the crystal rocks and brings with it high levels of heat. A zone of alteration called an aereole forms in the rock that surrounds the emplaced magma body. These surrounding rocks get heated to such an extent, their mineral structure undergoes changes.
Which is the best description of contact metamorphism?
Some rocks, such as limestone are made of minerals that are not flat or elongate. No matter how much pressure you apply, the grains will not align! Another type of metamorphism, contact metamorphism, occurs when hot igneous rock intrudes into some pre-existing rock.
What kind of metamorphic rocks are not foliated?
Because directed pressure is not a major factor in forming these rocks, they are generally non- foliated. Hornfels is the name applied to the wide variety of hard, non-foliated metamorphic rocks formed during contact metamorphism. Type # 2. Hydrothermal Metamorphism:
Which is the best description of low grade metamorphism?
Low-grade metamorphism often begins at depth of about 8 km where the temperatures range from 100°C to 200°C. Type # 5. Plutonic Metamorphism: This type of metamorphism is believed to occur at very great depths within the crust under conditions of very high pressure and very high temperature.