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Igneous Rocks Cont
Course: GEO 101, Fall 2008School: Washington State
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Boundaries Convergent Continental/Oceanic o Ocean Island Arcs (Ex. Andes, South America) and Continental Volcanic Arcs (Ex. Cascades) Intermediate to Felsic Composition o Andesites/Diorites to Rhyolites/Granites Partial melting from Plate Subduction Mantle Plumes Hot Spot Volcanic Island Chain (Ex. Hawaii) Mafic composition o Basalts dominate Melting of the mantle Continental Caldera (Ex. Yellowstone) o...
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Boundaries
Convergent Continental/Oceanic
o Ocean Island Arcs (Ex. Andes, South America) and Continental Volcanic
Arcs (Ex. Cascades)
Intermediate to Felsic Composition
o Andesites/Diorites to Rhyolites/Granites
Partial melting from Plate Subduction
Mantle Plumes Hot Spot
Volcanic Island Chain (Ex. Hawaii)
Mafic composition
o Basalts dominate
Melting of the mantle
Continental Caldera (Ex. Yellowstone)
o Felisc to intermediate composition
o Partial melting from overlying plate and mantle
Important Point
The composition of the magma is a reflection of where the took melting place and
what type of lithosphere is involved
Intrusive Igneous Rocks: Types and Shapes
Volcano
o A hill or mountain that forms from the accumulation of lava that erupts at
the surface
Plutons
o Large igneous bodies that cool underground
Intrusive
The Type and shape of an intrusion is based on the size, shape, and emplacement
orientation
Batholith
o The largest of intrusive rocks igneous rock bodies
Sill
o Intrudes parallel to sedimentary bedding many are horizontal
Dike
o Vertical or steeply inclined intrusion which cuts across other rock types
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Washington State - GEO - 101
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