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Volcanic Landforms
What happens after instrusive
rocks are exposed by erosion
Intrusive Igneous Forms
Magma solidified at great depth (so mineral
sizes are large)
Plutons (individual magma chambers)
Batholiths (merged magma chambers)
Form at great depth
Pluton seen because of glacial erosion, Chile
Brandberg, Western Namibia
Intrusive igneous rocks are often more
resistant to erosion, so they are
topographic highs
Plutons (individual magma chambers)
Large
Batholiths (merged magma chambers)
Laccolith
(bubble up strata)
Small Dikes – vertical magma cutting through
Sill – horizontal magma inserted between
Dike, Spanish Peaks, Colorado
more resistant than surrounding sediment,
so stand out
Dike, Picture Gorge
“China Wall”, South Mountain
Volcanic Neck.
Dike
Over time, the less resistant rock
(i.e., pyroclasts and less
consolidated lava flows) comprising
the flank of the volcano is eroded
away leaving the resistant neck
exposed in relief.
Shiprock (Tse bi Dahi, Rock With Wings), New Mexico is the classic example of a
volcanic neck (base of composite volcano, so deep that is intrusive rock)
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