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Metamorphic Rocks. Chapter 4 Section 3 Notes. Metamorphic Rocks. Changed by temperature, pressure and hot fluids. Heat and pressure result from one layer of rock on top of another layer. Sometimes temperature and pressure are great enough to melt rock, forming magma.
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Metamorphic Rocks Chapter 4 Section 3 Notes
Metamorphic Rocks • Changed by temperature, pressure and hot fluids.
Heat and pressure result from one layer of rock on top of another layer.
Sometimes temperature and pressure are great enough to melt rock, forming magma
Sometimes pressure flattens mineral grains in rocks without melting them.
As pressure and temperature continue to increase over time, one type of rock can change into several different metamorphic rocks.
Hot, water-rich fluids can move through rock, chemically changing it.
Classification of metamorphic rocks is done by composition and texture.
Foliated Texture • Mineral grains flatten and line up in parallel layers or bands.
Nonfoliated texture • Mineral grains grow and rearrange but do not form layers.
