Sedimentary Geology Geos 240 – Chapter 3-3 Sedimentary Petrology-3 Dr. Tark Hamilton Camosun...
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Transcript of Sedimentary Geology Geos 240 – Chapter 3-3 Sedimentary Petrology-3 Dr. Tark Hamilton Camosun...
Sedimentary Sedimentary GeologyGeology
Geos 240 – Chapter Geos 240 – Chapter 3-33-3
Sedimentary Sedimentary Petrology-3Petrology-3
Dr. Tark HamiltonDr. Tark Hamilton
Camosun CollegeCamosun College
LLRR
MudMud
Silty MudSilty Mud
Sandy Sandy MudMud
Muddy Muddy Silt/SandSilt/Sand
Breccia/ Breccia/ ConglomerConglomerateate
Field
Lab
Limestone names: Limestone names: Dunham/FolkDunham/Folk
Lime mudstone/Micrite
Wackestone/Biomicrite
Packstone/OomicriteIntrasparite Grainstone/Sparry Biomicrudite
Facies Map of Andros Island:Facies Map of Andros Island:E.G. Purdy 1963, Jour. Geol. & E.G. Purdy 1963, Jour. Geol. &
Satellite ViewSatellite View
A
B
CD
S
BStromatoporoid & Bryozoan Biosparite Grainstone
Dolomite Rhombs Replacing Dolomite Rhombs Replacing Cretaceous ChalkCretaceous Chalk
Dolostone Collapse Breccia, Dolostone Collapse Breccia, NWTNWT
Folded Radiolarian Chert, J. Cache Creek Fm.
DiagenesDiagenesis in is in
Clastic Clastic SedimentSediment
ss
F
F
Q
Bt
Hb
Niagara Escarpment Resistant Niagara Escarpment Resistant cap of Silurian Lockport cap of Silurian Lockport
Dolostone overlies Ordovician Dolostone overlies Ordovician Limestone & ShaleLimestone & Shale
The escarpment is aCuesta which forms the
North edgeof the Michigan Basin.
Click on photo for higher resolution.
Stromatoporoids, Lockport Dolomite, NY
Ordovician packstone Ordovician packstone (biomicrite)(biomicrite)
photo by Madeline Ernstphoto by Madeline Ernst
Stylolites
Ord. Limestone
DiagenesDiagenesisisin in
LimestoLimestonesnes::
Micrite Micrite recrystallirecrystalli
zeszesto Spariteto Sparite
Petrographic Goals for the Petrographic Goals for the CourseCourse
Distinguish Distinguish siliciclasticsiliciclastic (detrital) from (detrital) from carbonatescarbonates
Be able to correctly name a rock from its grain Be able to correctly name a rock from its grain and matrix composition and texture: e.g. and matrix composition and texture: e.g. feldspathic sandstone, lithic wacke, feldspathic sandstone, lithic wacke, carbonaceous shalecarbonaceous shale
Distinguish: quartz, feldspar, micas, Fe-oxidesDistinguish: quartz, feldspar, micas, Fe-oxides Describe grain size, shape and grain size Describe grain size, shape and grain size
distributions using a microscopedistributions using a microscope Distinguish: grains, matrix, cement & porosityDistinguish: grains, matrix, cement & porosity Recognize grain alignment, sedimentary Recognize grain alignment, sedimentary
layeringlayering
Petrographic Goals for the Petrographic Goals for the CourseCourse
Distinguish Distinguish CarbonateCarbonate from detrital rocks from detrital rocks Be able to recognize and name various types of Be able to recognize and name various types of
allochems (grains) and distinguish them from: allochems (grains) and distinguish them from: matrix, cements & porositymatrix, cements & porosity
Distinguish: cement types: carbonate, quartz, Distinguish: cement types: carbonate, quartz, hematitehematite
Distinguish fossils, ooliths and pelletsDistinguish fossils, ooliths and pellets Distinguish calcite and aragonite from dolomiteDistinguish calcite and aragonite from dolomite Classify carbonates by Dunham and Folk Classify carbonates by Dunham and Folk
schemesschemes Distinguish various types and %’s of porosityDistinguish various types and %’s of porosity