Transcript Slide 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
 Biological sediments: Peat, Coal, Chert, Chalk
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
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
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Sedimentary Petrology
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Classification of Clastic Sediments
Grain size & distribution
 Grain shape
 Composition
 Provenance
 Facies: continental, glacial, lacustrine, fluvial, deltaic,
littoral, shelf, deep basins
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Classification of Carbonates
Folk’s system and Energy Spectrum
 Dunham’s System
 Carbonate Facies from Purdy: Bahamas platform
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Estimating Particle Shapes
Estimating
Grain
Proportions
for various
particle
shapes and
areas
Sedimentary Petrology
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Evaporites
Classification
 Origin
 Distribution
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Diagenesis
Cementation/Recrystallization
 Pseudomatrix
 Secondary Porosity
 Fossilization
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Dolomite Intraclast Breccia
Ordovician, Ottawa
Classification
+ fractures, unconformities, fluid events
Classification by Grain Size
What comprises a sandstone?
QFL
+
Grain
Size
Prism
Provenance
Q
F
L
Bill Comes Ashore at Peggy’s Cove,
NS
The same source
What will the modern beach sand be?