Geology 103 Sedimentology and Stratigraphy SACRAMENTO STATE Tim
- Slides: 14
Geology 103 Sedimentology and Stratigraphy SACRAMENTO STATE Tim Horner Geology Department, CSU Sacramento Lecture #1: - Weathering and Sedimentary Textures Reading assignment: - Boggs, 5 th ed. , pp. 3 - 12, 45 - 63, 110 - 114
Sortingvisual and statistical values Figure 3. 4 From Boggs 5 th ed. , p. 51
Roundness- visual estimates Figure 3. 11 From Boggs 5 th ed. , p. 58
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:
Methods of measuring grain size Table 3. 1 From Boggs 5 th ed. , p. 46
From Boggs, Principles of Sedimentology and Stratigraphy, 5 th ed. , Figure 3. 9, p. 57
Zingg Form diagram From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5 th ed. , Fig. 3. 10, p. 58
Surface texture From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5 th ed. , Fig. 3. 12, p. 60
Grain Fabric From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5 th ed. , p. 61
Grain Fabric (imbrication) From Boggs, Principles of Sedimentology and Stratigraphy, 5 th ed. , p. 61 From Freidman and Sanders (1978), Principles of Sedimentology
Textural maturity Fig. 5. 6 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5 th ed. , p. 111
Compositional maturity Table 1. 2 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5 th ed. , p. 10
Compositional maturity Fig. 4. 1 from Boggs (2 nd ed. ? ) Principles of Sedimentology and Stratigraphy
Effect of grain size on composition From Blatt, Middleton and Murray, Origin of Sedimentary Rocks, 1980
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