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Igneous Rocks and Landforms
Igneous Rocks
21
Geology
Undergraduate 2
03/14/2011

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Term
Intrusive Igneous Rock Texture
Definition
Fine grained, volcanic, cooled quickly.
Term
Extrusive Igneous Rock Texture
Definition
Course Grained, Cooled inside the earth, plutonic.
Term
Porphyritic Texture
Definition
Course and fine grained.
Term
Color of Mafic Rock
Definition
Darker
Term
Pluton
Definition
Frozen Magma Chamber
Term
Batholith
Definition
Collection of plutons
Term
Dike
Definition
Vertical fracture filled with magma.
Term
Sill
Definition
Horizontal fracture filled with magma.
Term
Vein
Definition
Distinct sheet like body of crystalized minerals within a rock.
Term
Intrusive Felsic Rock
Definition
Granite
Term
Intrusive Mafic Rock
Definition
Gabbro, Diorite
Term
Intrusive Ultramafic Rock
Definition
Peridotite
Term
Pahoehoe
Definition
Ropey ridges, soft flow look, low viscosity, high temperature.
Term
AA
Definition
Sharp, pointy lava. High viscosity. Low Temperature.
Term
Vesicles
Definition
Rock filled with many air bubbles or vesicles.
Term
Pumice
Definition
Very Vesicular, Floats on water.
Term
Aphantic
Definition
No grains, like volcanic glass.
Term
Tuff
Definition
Type of rock consisting of consolidated volcanic ash.
Term
Pyroclastic Flow
Definition
Volcanic ash landslide
Term
Lahar
Definition
Volcanic ash and mud river.
Term
Explosivity of a Volcano
Definition
Controlled by gas content and viscosity.
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