GS104

Student objectives   

Igneous rocks

1.         Differentiate between:

          a.  intrusive vs extrusive

          b.  plutonic vs volcanic

2.   List and describe the factors that contribute to the size of crystals in an igneous rock.

3.   Understand what is meant by the following rock textures:

                                                                                    a. phaneritic     e.  amygdaloidal

            b. aphanitic                                                      f.  vesicle

            c. porphyritic                                                    g.  pegmatitic texture

            d. phenocryst                                                   h.  glassy

4.   Describe the classification of igneous rocks on the basis of silica content and iron

5.   Differentiate between an extrusive and an intrusive igneous   rock on the basis of time of crystallization and size of crystals

6.   Describe the relationship between granite, rhyolite, obsidian, and pumice

7.         Describe the relationship between andesite and diorite and the relationship between basalt and gabbro

8.   Describe the origin of magmas and discuss the role of heat, pressure, and volatiles. 

9.   Describe the Ageothermal gradient@

10.  Describe how magmatic differentiation can change the composition of a magma through time via the        

following:

            a.  crystal settling (gravity separation)                 d.  filter pressing

            b. partial melt                                                   e.  magma mixing        

            c.  assimilation

11.  Understand the sequence of crystallization in igneous rocks as described by the Bowen's Reaction Series and differentiate between the continuous and discontinuous series.