04_416M_Grain_Mineralogy_handout

04_416M_Grain_Mineralogy_handout - Grain Mineralogy Lecture...

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Grain Mineralogy Lecture Outline I.Crust composition II.Quartz III.Feldspar IV.Rock fragments V.Other grains VI.Classification Reading Assignment: Boggs, Chapter 5, p. 119-139 1
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Crust Composition: Rock Type Continental Crust : Granite ~ 60% Feldspar, 25% Quartz 10% Mica, Amphibole Sedimentary Rocks : Mudstones , Sandstones, Carbonates 2
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Net Result: Grain Types Most common grain produced is some type of Feldspar, but Feldspar weathers rapidly Quartz, already abundant, is enhanced on Earth surface because it is resistant to weathering Rock Fragments – mostly sedimentary, but can be metamorphic or volcanic Granite or Gneiss rock fragments are classified with Feldspar 3
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Breakdown of Primary Grains Types Quartz Plutonic = “common quartz” Volcanic Metamorphic = composite/polycrysalline Vein Feldspar Alkali Feldspar (Mostly K-Feldspar = K-spar) plagioclase Rock fragments Sedimentary (SRF) Metamorphic (MRF) Volcanic (VRF) 4
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5 Sandstone Classification Scheme Q: Quartz grains F: Feldspar grains L: Lithic grains (rock fragments)
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Determining Composition of Sand Grains Using a Petrographic Microscope Short set of notes and photos useful for
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This note was uploaded on 02/08/2011 for the course GEO 416M taught by Professor Staff during the Fall '08 term at University of Texas.

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04_416M_Grain_Mineralogy_handout - Grain Mineralogy Lecture...

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