Metamorphic Rocks Geology Worksheet - 3 Rd Year Lab. No. (5)
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1
2rd
Petroleum and Mining Engineering Dept.
General Geology- Practical
3
Year
Lab. No. (5)
Metamorphic Rocks
Metamorphic rocks: type of rock which is can be formed from igneous, sedimentary, or previously
metamorphosed rocks by recrystallization in the solid state.
Main factors of metamorphism:
1/Temperature
2/Pressure
1. Type of metamorphism:
1. Contact (Thermal) metamorphism: temperature is the main factor for metamorphism.
Myllonite
2. Dynamic metamorphism: pressure is the main factor for metamorphism. Example:
3. Regional metamorphism: temperature and pressure together are caused metamorphism.
2. Class: There are three main classes of metamorphic rocks:
a. Foliated Rocks: Minerals to arrange themselves in a parallel sheets show orientation.
b. Non Foliated Rocks: Minerals do not show a discernible preferred orientation.
c. Cataclastic Rocks: Grains arranged themselves under pressure influence.
3. Texture: Represent size and arrangement of grains-forming rocks.
4. Parent rocks: Represent the previous rocks (parent rock) which rock transformed from.
Slate
Slaty
Fine
Shale, mud
Fine-
Phyllite
Phyllitic
Shale, slate
medium
Medium-
Shale, slate, Phyllite,
Schist
Schistosity
Coarse
basalt
Gneiss
Gneissic
Coarse
All rocks
Myllonite
Cataclastic
Coarse
All rocks
Hornfels
Very fine
Shale, basalt
Fine -
Quartizite
Sandstone chert
Coarse
Fine -
Limestone or
Marble
Coarse
Dolomite
Fibrous-
Serpentine igneous
Serpentinite
coarse
rocks
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