IGNEOUS ROCKS

know what magma consists of?

Name and describe the 4 different types of magma in terms of the relative silica content.

Describe and understand the important processes that result in the variations in magma compositions and how these processes occur (e.g. partial melting, assimilation, mixing of magmas, fractional crystallization).

/ Describe Bowen's Reaction Series and how it gives rise to different types of igneous rocks (see Fig. 4.5)

know what the characteristics of intrusive igneous rocks are including the following terms: baked zone, chill margin, and xenolith.

understand the influence of magma intrusion on older country rocks including: − / thermal (heat) metamorphism and melting −/ inflation of fractures pushing the rock aside. − / incorporation of country rock fragments (xenoliths) − / hydrothermal (hot water) alteration (more on this in chapter 5)

Name and describe all kinds of Intrusive rock bodies as well as to differentiate between concordant and discorcant rock bodies (e.g. tabular vs. plutonic bodies, batholite, laccolith vs. lopolith, stock, and sill vs. dike).

/ understand what are the three factors that control the cooling time of magma

Name and describe types of igneous rock textures (e.g. glassy, interlocking mineral crystals or crystalline, fragmental), including: − / Aphanitic − / Phaneritic − / Porphyritic − / Pegmatitic

Name and describe the classification of igneous rocks, including: − / glassy igneous rocks (e.g. obsidian, pumice, and scoria) − / Pyroclastic igneous rocks (e.g. tuff, vulcanic brecia, and hyaloclastite) − / the different crystalline igneous rocks according to composition and mineral content (Fig. 4.13)

know the types of granitic rocks (e.g. granite, rhyolite, granodiorite, and daciet)

know the types of dioritic rocks (e.g. diorite, and andesite).

Know the types of gabbroic rocks (e.g. gabbro, basalt, dolerite or diabase, and anorthosite).

Know the types of ultramafic rocks (e.g. pyroxenite, peridotite, dunite, komatiite, kimberlite).