Download Ch. 22.6: Igneous Features (Not Volcanoes)

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Transcript 
Ch. 22.6: Igneous Features (Not
Volcanoes)
Volcanic, but not a volcano
Other Extrusive Igneous Features (not
volcanoes)
Lava Plateau: Large amounts of easily flowing
lava erupting fr. cluster of long, thin cracks in
crust. Lava spreads out over enormous area
before solidifying.
Ex.: Columbia Platueau in Pacific NW (1 km
thick / 200,000 square mi)
Basalt
Columbia Plateau in
Idaho =
Lava Plateau
Intrusive Igneous Features: Magma
cools underground
Batholith: Large type of intrusive igneous rock
mass that can form the core of a mountain
range (Sierra Nevada’s in Calif.)
Sill: Magma squeezes through cracks in rock
layers and hardens / Paralles to rock layers.
Dike: Igneous rock cuts across rock layers.
Volcanic Neck: magma hardens in volcanic
neck.
Half Dome at Yosemite
National Park (Sierra
Nevada Mts) = Forms
when batholith that was
originally under surface
reaches surface (rock on
top of erodes away or it is
pushed upwards)
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