Objectives for the topic: Magma and Intrusive Rocks

Reading: Chapter 3 in Tarbuck and Lutgens

Images to understand: 3.2, 3, 4, 5, 7, 8, B, 20, 21, 22, 23, 24

After completing this topic, the student will be able to:

1. Describe the compositional range of extrusive igneous rocks (compare basalt, andesite and rhyolite).
2. Describe the relationship of texture (grain size, bubble content) in extrusive igneous rocks to the cooling history of the magma/lava.
3. Describe the three factors that generate magmas from solid rock.
4. Describe the processes by which magmas can change composition as they ascend through the crust (crystal settling, assimilation, magma mixing)
5. Describe the plate tectonic settings in which magmas of basaltic or granitic composition are generated.
6. Identify a coarse-grained intrusive texture, and distinguish it from the texture of extrusive rocks.
7. Compare and contrast the texture and origin of pairs of igneous rocks (e.g. granite/rhyolite or granite/basalt).
8. Name the most abundant intrusive igneous rock forming the continental crust.