Answer :
Final answer:
Schist, gneiss, and migmatite are the rock types that generally form in prograde metamorphism of pelites. They have characteristic textures that result from the metamorphic processes they undergo.
Explanation:
In prograde metamorphism of pelites, the rock types that generally form are schist, gneiss, and migmatite. These rocks have characteristic textures that are a result of the metamorphic processes they undergo.
Schist is a foliated metamorphic rock that is characterized by the alignment of platy minerals, giving it a parallel layering. Gneiss is also a foliated metamorphic rock, but it has a banded appearance due to the alternating layers of different minerals. Migmatite is a complex rock that exhibits both metamorphic and igneous features, with areas of melted and recrystallized rock.
These rock types form in prograde metamorphism when pelites, which are fine-grained sedimentary rocks composed mainly of clay minerals, are subjected to increasing temperature and pressure over time. The minerals in the pelites undergo recrystallization and alignment, resulting in the formation of schist, gneiss, and migmatite.
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The rock types that generally form prograde methamorphism of pelites are gravel, sandy and clayey.
Pelite is a geological term to refer to those rocks that are characterized by:
- Being the metamorphic form of fine grains of sedimentary rock.
- Another name by which they are known is metapelita.
These rocks are classified according to the texture or size of the sediment grains which are:
- Coarse textured grains, commonly known as full of gravel, is also known as Psefita (ancient Greek name) or rudite (Latin name)
- Grain of medium texture, commonly known as sandy, is also known as Psamite (ancient Greek name) or arenite (Latin name)
- Fine grain, commonly known as clayey. It is also known as pelite (ancient Greek name) or lutita (Latin name)
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