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Sedimentary Textures and Grain Analysis Techniques

Explore weathering, roundness, sphericity, and grain size measurements in sedimentary rocks. Learn visual and statistical analysis methods. Reading assignments from Boggs' 5th edition.

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Sedimentary Textures and Grain Analysis Techniques

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  1. SACRAMENTO STATE Geology 103Sedimentology and StratigraphyTim HornerGeology Department, CSU Sacramento Lecture #1: - Weathering and Sedimentary Textures Reading assignment: - Boggs, 5th ed., pp. 3 - 12, 45 - 63, 110 - 114

  2. Sorting- visual and statistical values Figure 3.4 From Boggs 5th ed., p. 51

  3. Roundness- visual estimates Figure 3.11 From Boggs 5th ed., p. 58

  4. Roundness vs. sphericity Roundness the sharpness (or roundness) of the corners can be estimated visually or calculated                     Average Radius of Corners and Edges Roundness = _______________________________________                    Radius of Maximum Inscribed Circle Sphericity how closely the object represents a sphere (3-d) determined by measuring x, y, z axis calculated with an equation:

  5. Methods of measuring grain size Table 3.1 From Boggs 5th ed., p. 46

  6. From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 3.9, p. 57

  7. Zingg Form diagram From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., Fig. 3.10, p. 58

  8. Surface texture From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., Fig. 3.12, p. 60

  9. Grain Fabric From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 61

  10. Grain Fabric (imbrication) From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 61 From Freidman and Sanders (1978), Principles of Sedimentology

  11. Textural maturity Fig. 5.6 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 111

  12. Compositional maturity Table 1.2 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 10

  13. Compositional maturity Fig. 4.1 from Boggs (2nd ed.?) Principles of Sedimentology and Stratigraphy

  14. Effect of grain size on composition From Blatt, Middleton and Murray, Origin of Sedimentary Rocks, 1980

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