how do the temperature and pressure influence the metamorphic grade change from the protolithic rock
Answers
Answer:
Metamorphism occurs because some minerals are stable only under certain conditions of pressure and temperature. When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions.
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Explanation:
Metamorphism occurs because some minerals are stable only under certain conditions of pressure and temperature. When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions.
Gneiss is formed by the highest temperatures and pressures during regional metamorphism. It is a coarse grained (>5 mm), crystalline rock with gneissose banding. Gneiss is typically composed of quartz and feldspar in the light bands and biotite mica (and other mafic minerals) in the dark bands.
Thermal metamorphism is when rocks are changed as a result of great heat. ... As the hot molten magma came in contact with the surrounding sandstone rock, intense heat caused it to change to quartzite. This quartzite was exposed as the overlying rock was eroded as a result of weathering and erosion.