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Petrology Introduction

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Petrology Introduction GLY 4310 Spring, 2013 * * Petrology Definition That branch of geology dealing with the origin, occurrence, structure, and history of rocks ... – PowerPoint PPT presentation

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Title: Petrology Introduction


1
Petrology Introduction
  • GLY 4310
  • Spring, 2013

2
Petrology Definition
  • That branch of geology dealing with the origin,
    occurrence, structure, and history of rocks,
    especially igneous and metamorphic rock (from
    Glossary of Geology, 2nd edition)

3
Petrography
  • Branch of geology dealing with the description
    and systematic classification of rocks,
    especially igneous and metamorphic rocks, and
    especially by means of microscopic examination of
    rock thin sections

4
Etymology
  • From Greek petra, meaning rock, and logos,
    meaning knowledge
  • Pronunciation (p? träl'? je)

5
Igneous Petrology
  • Igneous petrology is the study of magma and the
    rocks that form as magma's cool
  • Magma is molten rock

Mt. Etna erupted spectacularly in 2001 June
6
Background for Petrology
  • Petrography
  • Experimental lab data
  • Chemistry
  • Earths structure and composition

7
Identification of Igneous Rocks
  • Since it is rarely possible to observe the
    crystallization process directly, criteria for
    the identification of igneous rocks must be
    developed
  • We can separate these criteria into field
    criteria and textural criteria
  • The latter are usually observed in the laboratory

8
Field Criteria
  • Intrusive
  • Extrusive

9
Textural Criteria
  • Careful examination of rocks in the laboratory,
    and the preparation of thin sections for
    microscopic examination, reveal features not
    observable in the field
  • Intrusive
  • Extrusive
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