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
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 Particle Shapes
Estimating
Grain
Proportions
for various
particle
shapes and
areas
Sedimentary Petrology
Evaporites
Classification
Origin
Distribution
Diagenesis
Cementation/Recrystallization
Pseudomatrix
Secondary Porosity
Fossilization
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?