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OU / Geology / GEOL 3223 / What are the different classifications of igneous rocks?

What are the different classifications of igneous rocks?

What are the different classifications of igneous rocks?

Description

School: University of Oklahoma
Department: Geology
Course: Igneous and Metamorphic Petrology
Professor: Barry weaver
Term: Spring 2016
Tags: Geology, igneous, metamorphic, and Petrology
Cost: 50
Name: IgMet Exam 1 Study Guide
Description: Covers Igneous Classification through Magma Modification
Uploaded: 02/13/2017
11 Pages 102 Views 2 Unlocks
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Classification of Igneous RocksDon't forget about the age old question of What is a list of all accounts and their balances at a particular date?

We also discuss several other topics like Why were the vikings able to win control over so much of britain in the 9th century?

Review of basic wt %  classification

Wt. %

Classification

Mineralogy

>66

Silicic (Felicic Acid): Granite, Rhyolite

52-66

Intermediate:Diolite, Andesite

45-52

Magic(Basic): Gabbro, Basalt

<45

Ultramafic(ultrabasic): Peridotite, Dunite

  • Memorize min names, formulas (frost appendix)
  • Understand how to use Streckeisen Classification Scheme

Don't forget about the age old question of What is an example of a contra account?

CIPW norm

Mineral Associations:

: Apatite                        : Anorthie, pyroxeneWe also discuss several other topics like What are hofstede's 5 dimensions?

: Ilmenite                        : Ilmenite, Magnetite, pyroxene, olivineIf you want to learn more check out How does gender play a part?

: Orthoclase                Pyroxene, olivine

: Albite                        all silicate mineralsWe also discuss several other topics like Where to get the inserts?

: Feldspar

exess                 Quartz normative → Silica Oversaturated

 deficient                Hypersthene normative → Silica Saturated

↓                Nepheline normative → Silica Undersaturated

Can not have:

                        

If  deficient:        to

                ○

If needed        ○

     ↓                ○

Chemical and Normative Classification

Alkaline:

  • Silica undersaturated, normative
  • Hotspot magmas

Sub-Alkaline:

  •  
  • Silica saturated or oversaturated;  or  normative

Can be:

        Tholeiitic

  • Lower for a given  content
  • Mid-ocean ridge magmas

                Calc-Alkaline

  • Higher  for a given content
  • Subduction zone magmas
  • No Fe-enrichment trend on

Phase Diagrams

Gibbs phase rule:

P: number of phases

F: degrees of freedom (P,T,X..)

C: number of chemical components

Unary Systems:

X fixed, C=1

Ex. , aluminosilicates

                                        Invariant point

                                        P=3 F=0

                                                                                        Univariant Line

                                                                                        P=2 F=1

                                                                                        Divariant Field

                                                                                        P=1 F=2

Binary Systems

C=2

Isobaric (fixed P) systems

No

Solid

Solution

                                        

With

Intermediate

Compound

Peritectic is a reaction Point:

To                Liquid        Enstatic

Equilibrium vs. Fractional Crystallization

EQ                                                        Fractional

- crystals remain in EQ with magma                        - crystals are not in EQ with magma

throughout crystallization                                crystals is settle out

        

Ex:                                                         Ex:                

                                                                        100%

                

                

                                                                        

                                                                Qtz + Ol can not exists

P effect

                                        Incongruent melting of En → higher  content may end

up with some Qtz        

一 silica oversaturated → Qtz tholeiite

Low P

Congruent melting of En

一 silica saturated → Hy normative tholeiite

                5k bar

                                        Melt is of eutectic composition

                                        一 silica unsaturated

                                        Alkali Basalt (Nepheline normative)

        High P

Lower rule: 100% liquid →

                        

                                

                                                Final Comp

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