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Sedimentary Geology Geos 240 – Chapter 3 Sedimentary Petrology-1

Sedimentary Geology Geos 240 – Chapter 3 Sedimentary Petrology-1. Dr. Tark Hamilton Camosun College. Sedimentary Petrology. Classification of Sediments Clastic or Detrital Sediments: prior rocks & minerals Chemical: precipitates & products of reactions

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Sedimentary Geology Geos 240 – Chapter 3 Sedimentary Petrology-1

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  1. Sedimentary GeologyGeos 240 – Chapter 3Sedimentary Petrology-1 Dr. Tark Hamilton Camosun College

  2. Sedimentary Petrology • Classification of Sediments • Clastic or Detrital Sediments: prior rocks & minerals • Chemical: precipitates & products of reactions • Biological sediments: Peat, Coal, Chert, Chalk • Components of Sediments • Grains: rocks, sand, fossils, clays, organics, allochems • Matrix: mud or finer bulk material than larger grains/clasts, orthochems • Cements: calcite, silica, iron oxides, clays, zeolites

  3. Sedimentary Petrology • Classification of Clastic Sediments • Grain size & distribution • Grain shape • Composition • Provenance • Facies: continental, glacial, lacustrine, fluvial, deltaic, littoral, shelf, deep basins • Classification of Carbonates • Folk’s system and Energy Spectrum • Dunham’s System • Carbonate Facies from Purdy: Bahamas platform

  4. Estimating Particle Shapes

  5. Estimating Grain Proportionsfor various particle shapes and areas

  6. Sedimentary Petrology • Evaporites • Classification • Origin • Distribution • Diagenesis • Cementation/Recrystallization • Pseudomatrix • Secondary Porosity • Fossilization

  7. Dolomite Intraclast BrecciaOrdovician, Ottawa

  8. Classification

  9. + fractures, unconformities, fluid events

  10. Classification by Grain Size

  11. What comprises a sandstone?

  12. QFL+GrainSizePrism

  13. Provenance Q F L

  14. Bill Comes Ashore at Peggy’s Cove, NS The same source What will the modern beach sand be?

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