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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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