Metamorphic rocks CJ MacKay Jefferson vivanco. Metamorphism The process of forming metamorphic rocks...
-
Upload
edwina-shelton -
Category
Documents
-
view
218 -
download
0
Transcript of Metamorphic rocks CJ MacKay Jefferson vivanco. Metamorphism The process of forming metamorphic rocks...
Metamorphic rocks
CJ MacKay
Jefferson vivanco
Metamorphism
The process of forming metamorphic rocks within the lithosphere, making the rocks more dense and less porous.
QuickTime™ and a decompressor
are needed to see this picture.
Metamorphic rock
Are formed from existing rock (sedimentary, igneous, metamorphic) by the action of heat, pressure, and chemicals.
QuickTime™ and a decompressor
are needed to see this picture.
Parent rocks
• The parent rock is the rock that is metamorphosed
Texture
• Non foliation
• Foliation
Foliation
• gives the appearance of parallel light and dark bands,or is simply a platy or flaky texture
QuickTime™ and a decompressor
are needed to see this picture.
Non Foliation
• display a massive texture, caused by the recrystallization of the crystals that were present in the relatively homogenous parent rock from which they were formed
QuickTime™ and a decompressor
are needed to see this picture.
Recrystallization
• is the process of changing the mineral composition or increasing the size of the mineral crystals with out melting
QuickTime™ and a decompressor
are needed to see this picture.
Regional metamorphism
• When high temperatures and pressure affect large regions of earths crust, they produce large belts known as regional metamorphism
Contact Metamorphism
• When molten material, such as that in an igneous intrusion, comes in contact with solid rock.
Hydrothermal metamorphism
• When very hot water reacts with rock and alters its chemical and mineral composition.
QuickTime™ and a decompressor
are needed to see this picture.