Section 3 Igneous Rock Features. Rocks.htm.
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Transcript of Section 3 Igneous Rock Features. Rocks.htm.
Section 3
• Igneous Rock Features
http://canarygeog.canaryzoo.com/Rocks Rocks.htm
Batholith
• Large, intrusive igneous rock
• Often granite or felsic composition
Sill
• Intrusive igneous rock forced between other layers
• Parallel to pre-existing layers
Edinburg--Salisbury Crags
Dike
• Intrusive igneous rock forced between other rock
• Cuts across other rocks
Laccolith
• Intrusion between layers of sedimentary rock
• Often mound shaped at top
Volcanic Neck/Plug
• Magma that cooled in conduit of volcano
• Exposed by erosion of volcano
Rhumsiki Peak, Cameroon
Problem
• Applying Math p 346
• Classifying Igneous rocks
• 3 types of igneous rock based on silica content:– Granitic: More than 66%– Intermediate (Andesitic): 52%-66%– Basaltic: 45%-52%
• A 900 kg block of igneous rock contains 630 kg of silica. What is its classification?
• What we know:– Total rock: 900 kg Silica: 630 kg
• Equation:– Percent = (Mass silica / Mass total) x 100
• Put numbers in:– Percent = (630 kg/900 kg) x 100
• Solve:– 70% so it is _____________________