Geology Final Exam: Igneous Rocks
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Visible Large Crystals
Not Visible Small Crystals
Both Large and Small Crystals
Magma chambers moves as it cools toward the surface
- Made up of Silica, cools rapidly
- No Crystals
- Fragments of rock from a volcanic eruption
- Chucks of ash
Super Large Crystals (greater than one centimeter)
Describe the four compositional classifications of igneous rocks.
- Felsic (Granitic)
- High in silica (less that 25% dark silicates)
- Intermediate (Andesitic)
- Mix of Felsic and Mafic (25% - 45% dark silicates)
- Mafic (Basaltic)
- Rich in iron and magnesium (45%-85% dark silicates)
- Less than 10% feldspar (greater than 85% dark silicates)
What is decompression melting?
The spontaneous melting of rising mantle material as it reaches a level where pressure decreases below a critical point, without the introduction of any additional heat.
Describe the Bowen’s reaction series.
Model that predicts the order minerals crystallize.
- Biotite Mica
- Potassium Feldspar
- Muscovite Mica
What is partial melting?
Incomplete melting of rock
In general, do you expect magma to be more felsic or more mafic than the rock from which it melted?
What would you like to do?
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