1. Intrusive Landforms

2. Intrusive Landforms
Intrusive landforms are formed from bodies of magma cooling below the Earth’s surface
They form rocks with coarse texture and visible minerals (granite, gabbro, diorite) rather than the fine textured rocks formed by volcanic landforms (basalt, pumice, scoria)

3. Shallow Intrusive Structures
Volcanic neck – extinct throat of a volcano
Dike – tabular igneous bodies that cut across other layers and are nearly vertical or at steep angles
Black Tusk in Garabaldi Prov Park
Near Squamish and visible from Hwy 99

4. Shallow Intrusive Structures
Sill – nearly horizontal tabular igneous bodies
Laccoliths – start out as sills, but become wider as they fill with more magma (bulged sills)

5. Deep Intrusive Structures
Batholith – a large area (>100 km2) igneous intrusion
Stocks – smaller area igneous intrusions (< 100 km2)

6. Deep Intrusive Structures
Xenoliths = large chunks of older rock that is included in an igneous rock body
Pluton = A body of intrusive igneous rock that is crystallized from magma slowly cooling below the earth’s surface.