Chapter 7. Igneous Rocks

Introduction

Learning Objectives

After carefully reading this chapter, completing the exercises within it, and answering the questions at the end, you should be able to:

  • Explain partial melting and the geological processes that lead to melting
  • Describe, in general terms, the range of chemical compositions of magmas
  • Discuss the processes that take place during the cooling and crystallization of magma, and the typical order of crystallization according to the Bowen reaction series
  • Explain how magma composition can be changed by fractional crystallization and partial melting of the surrounding rocks
  • Apply the criteria for igneous rock classification based on mineral proportions
  • Describe the origins of phaneritic, porphyritic, and pegmatitic textures
  • Identify plutons on the basis of their morphology and their relationships to the surrounding rocks
  • Explain the origin of a chilled margin

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