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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 GeologyGeos 240 – Chapter 3Sedimentary Petrology-1 Dr. Tark Hamilton Camosun College
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
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
Estimating Grain Proportionsfor various particle shapes and areas
Sedimentary Petrology • Evaporites • Classification • Origin • Distribution • Diagenesis • Cementation/Recrystallization • Pseudomatrix • Secondary Porosity • Fossilization
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Bill Comes Ashore at Peggy’s Cove, NS The same source What will the modern beach sand be?