Sedimentary Rock Origins Classification · 2008-05-14 · The Simple Ideal Model for sedimentary...
Transcript of Sedimentary Rock Origins Classification · 2008-05-14 · The Simple Ideal Model for sedimentary...
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Sedimentary Rock Origins
and Classification
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Minerals and Rocks(and everything else)
Are StableOnly Under the Conditions
At Which They Form
Our Core Principle
Change the Conditions and They Must Change Also
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http://www.homepage.montana.edu/~ueswl/images/theilinpike.gif
Selected Igneous Rock Locations of the United States
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Our Core Principle
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Our Core Principle
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With weathering the two major sources of energy are:
Tectonic
Solar
Biological
Chemical
Initial molten state + Radioactive heat + its counter force, gravity
Heat causes things to expand which causes them to move
Heat from the sunHeat warms the air and water, setting up different pressures which causes them to move.
Inorganic reactions, of which there are many, many, many – some of which we need to understand
Organic chemistry, plus biological modifications of environments
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The Simple Ideal Model of Sedimentary
Rock Evolution
Fractionation ProcessesAt the Earth’s Surface
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P 128
The Simple Ideal Model for the Evolution of Sedimentary Rocks
Average ContinentalIgneous Rock
Granodiorite
Complete Weathering
3 Mixed WeatheringProducts
QtzSand
Quartz Sand
Clay
Kaolinite
Dissol.Calcite
Calcite
Separation DuringTransportation
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
http://www.nku.edu/~biosci/CostaRica2003/Punta%20Marenco/Day3/CR%20SanJose%20to%20PM.htm
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
http://www.nps.gov/olym/elwha/photos/elwhamouth.htm
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
http://www.serf.tamus.edu/ResearchProjects/TexasInletsOnline/BrazosRiverMouth/Brazos%20River%20Main.htm
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
QtzSand Clay Calcite
Separation DuringTransportation
Beach
Near Shelf Far ShelfQtz. Sandstone
Shale Limestone
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
http://www.serf.tamus.edu/ResearchProjects/TexasInletsOnline/BrazosRiverMouth/Brazos%20River%20Main.htm
Tapeats Qtz ss
Bright Angle Shale
Muav Limestone
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Middle Cambrian - 510
http://jan.ucc.nau.edu/~rcb7/nam.html
Begin first major sea level rise
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Late Cambrian - 500
http://jan.ucc.nau.edu/~rcb7/nam.html
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Early Ordovician - 485
http://jan.ucc.nau.edu/~rcb7/nam.html
Tran
scontine
ntal
ArchAnt
ietam
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Weathering Processes
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Mechanical Weathering• Making little pieces out of big ones.• Composition of original rocks does not
change.• Result: lithic fragments
Chemical Weathering• Original minerals chemically break down.• Result: formation of new minerals
stable at Earth-surface conditions.
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Mechanical WeatheringFrost Wedging via Freeze and Thaw
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http://www.utexas.edu/depts/grg/hudson/grg301c/hudson_grg_301c/schedule/4_water_geomorph_images/10_weathering/2.htm
Mechanical WeatheringFrost Wedging via Freeze and Thaw
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http://www.gly.fsu.edu/%7Esalters/GLY1000/10Weathering_Erosion/Slide27.jpg
Mechanical WeatheringFrost Wedging via Freeze and Thaw
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http://www3.famille.ne.jp/~kazuo/SR-044.jpg
Mechanical WeatheringPlant Wedging
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http://www.calstatela.edu/faculty/acolvil/weathering.html
Mechanical WeatheringExfoliation
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Chemical Weathering• Original minerals chemically break down.• Result: formation of new minerals
stable at Earth-surface conditions.
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Chemical WeatheringDissolution
CO2 + H2O H2CO3Carbonic Acid
H2CO3 H+ + HCO3
CaCO3 + H+ Ca++ + 2 HCO3-
DissolvedCalcium
BicarbonateIon
Calcite/Limestone
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Chemical WeatheringDissolution of Limestone
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http:��web.mala.bc.ca�geoscape�Karst.htm
Chemical WeatheringDissolution of Limestone
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Chemical WeatheringDissolution of Limestone
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Chemical WeatheringDissolution of Limestone
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Chemical WeatheringDissolution of Limestone
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Chemical WeatheringDissolution of Limestone
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Chemical WeatheringOxidation
4 FeSiO3 + O2 + 8 H2O
4 FeO(OH).n H2O + 4 SiO4
Limonite Goethite
Pyroxene
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Chemical WeatheringOxidation
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Chemical WeatheringHydrolysis
KAlSi3O8 + H2CO3 + 12 H2OOrthoclase
2K+ + 2HCO3- + 5H4SiO4 +
Kaolinite Clay
Dissolved Silica
+ Al2Si2O5(OH)
KAl3Si3O10(OH)
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http://faculty.uaeu.ac.ae/~afarrag/physical%20geology/physical5.htm
Chemical WeatheringHydrolysis
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http://www.earthsci.gla.ac.uk/Holyrood7/Images/glacial/spweath.jpg
View of the Salisbury Crags sill from the Radical Road. Looking northeast. Spheroidal weathering is best seen in the centre of the image. The field of view is approximately 4 m.
Chemical WeatheringHydrolysis
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http://epswww.unm.edu/facstaff/gmeyer/eps481/images/corestones.jpg
Chemical WeatheringHydrolysis
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http://www.calstatela.edu/faculty/acolvil/weathering/spheroidal2.jpg
Chemical WeatheringHydrolysis
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Mobility of Weathering ProductsVery
Mobile ImmobileCa > Na > Mg > K > Si > Fe > Al
Fast Weathering
SlowWeathering
NoWeathering
This provides the differences needed for fractionation and evolution to take place.
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Mobility of Weathering Products
Very Mobile ImmobileCa > Na > Mg > K > Si > Fe > Al
LateriteSoil
Bauxite
A Chemical Fractionation Process
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P 131
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Basic Question: compared to the igneous rocks they started as, is the composition of a
clastic sedimentary rock higher on the reaction series, lower on the reaction series,
or at the same place?
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The sea is salty
Soluble
Soluble
The sea is salty
Clastic Rocks Carbonate Rocks
Soluble
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Basic Question: compared to the igneous rocks they started as, is the composition of a clastic sedimentary rocks higher on the reaction series, lower on the reaction series, or at the same place?
Clastic sedimentary rocks (sandstones and shales) evolve.
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Fates of Weathering
Products
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The Simple Ideal Model for the Evolution of Sedimentary Rocks
Average ContinentalIgneous Rock
Granodiorite
Complete Weathering
Mixed WeatheringProducts
QtzSand
Quartz Sand
Clay
Clay
Calcite
Calcite
Separation DuringTransportation
Beach
Near Shelf Far Shelf
SandstoneShale Limestone
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Rock Mineral CationWeathering
ProduceSedimentaryOutcome
Gabbro
Diroite
Alkaligranite
Olivine
Pyroxene
Ca plagioclase
Amphibole
Na plagioclase
Orthoclase
Quartz
FeMg
Ca
FeMg
Na
K
Quartz
Hematite/Limonite
CaCO3calcite
CaSO4gypsum
Hematite/Limonite
NAClhalite
Kaolinite
Quartz
Stains(yellow, brown, red)
Stains(yellow, brown, red)
Limestone
Gypsum
Rock Salt
Clay/Shale
Sand grains
Weathering of Igneous Rocks
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Classifying Sedimentary Rocks with Ternary
Diagrams
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The Simple Ideal Model for sedimentary rocks results in three end members: quartz sand, clay, and calcite in solution.
Things show up in threes a lot when we look at the Earth, and many classifications are based on threes – that is a triangular (or ternary) diagram.
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Reading Ternary Diagrams
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Reading Ternary Diagrams
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Reading Ternary Diagrams
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Reading Ternary Diagrams P 131
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Reading Ternary Diagrams
A
ASSSHLS
50%20%30%
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Reading Ternary Diagrams
B
BSSSHLS
10%70%20%
C
CSSSHLS
80%20%00%
D
DSSSHLS
20%40%40%
ASSSHLS
50%20%30%
A
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Naming Sedimentary Rocks
BSSSHLS
10%70%20%
CSSSHLS
80%20%00%
DSSSHLS
20%40%40%
ASSSHLS
50%20%30%
SandstoneShaley-limey Sandstone
Sandy-limey Shale
Shaley Sandstone
Sandy-shaley Limestone38%42%
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Sedimentary Rock Classification
Carbonates
Clas
tics
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Evolution of Clastic Sediments
on a Ternary Diagram
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Sediment Evolution on a Ternary Diagram1 1Quartz
Feldspar
Ca Plagioclase
Na Plagioclase
Orthoclase
Lithics
Clay (matrix)(shale)
The Q, FL, and M Axes
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Sediment Evolution on a Ternary Diagram2 2Quartz
Feldspar/
Granite
Lithics
Plagiogranite
Gabbro Syenite
Gabbro &Syenite
Q = 30%F = 65%L = 05%
Q = 00%F = 45%L = 55%
Q = 00%F = 80%L = 20%
Igneous Rock Composition
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram3 3Quartz
Feldspar/
Granite
Lithics
weathering30% Q70% F & L Feldspar/lithics to clay
30% Q70% clay
Weathering
Igne
ous
Rock
s Sedimentary Rocks
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram4 4Quartz
Feldspar/
Granite
Lithics
30% Q70% F & L
30% Q70% clay
sorting
Sand goes to top
Clay goes to bottomNear shore shelf
Stays on beach
Sorting
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram5 5Quartz
Feldspar/
Granite
Lithics
30% Q70% F & L
10 clay60 FL
2050
3040
4030
5020
6010 30% Q
70% Clay
30% Q70% F & L CLAY
Step by Step Weathering
Completed Weathering
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram6 6Quartz
Feldspar/
Granite
Lithics
10 clay60 FL
2050
3040
4030
5020
6010 30% Q
70% Clay
Step by Step Weathering
Completed Weathering
10 clay30 FL
2020
3010
4030
60 Q40 FL
25 % line for F & L
10 % line for F & L
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram7 7Quartz
Feldspar/Lithics
Naming the Rocks
This triangle has greater than 25% F & L, either solely, or mixed with quartz + varying amounts of clay.
Feldspathic(arkosic)
or, Lithic
This area is approaching the end of weathering; F & L are down to between 10 and 25%.
Sub-feldspathicor sub-lithice.g. a lithic sandstone
Shale
Quartz wacke
25% line
10% line
The last sliver has mostly quartz, or clay, or mixed quartz and clay.
Quartz ss
Sub-feldspathicwacke
Feldspathicwacke
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram8 8Quartz
Feldspar/Lithics
Clastics and Carbonates
or a lithic wacke Shale
Quartz wacke
Quartz ss
Sub-feldspathicwacke
Feldspathicwacke
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram9 9Quartz
Feldspar/Lithics
Carbonates and Evaporates
Ca Plagioclase
Na Plagioclase
Ca/Naleaves the diagram
LimestoneGypsumRock Salt
Clay (matrix)(shale)
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Sediment Evolution on a Ternary Diagram10 10Quartz
Feldspar/Lithics
Clastics and Carbonates
Ca/Naleaves the diagram
LimestoneGypsumRock Salt
Clastic R
ocksCarbonate/
Evaporate
Clay (matrix)(shale)
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Dead Sea
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http://www.galilcol.ac.il/ecards.asp
Dead SeaSalt concentrations are so high that people
can float in the water without effort.
Salt crusts on the edge of the Dead Sea
http://www.galilcol.ac.il/ecards.asp
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http://www.trekearth.com/gallery/Africa/Tunisia/South/photo78623.htm
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http://members.tripod.com/bradleyvw/
Great Salt Lake, Utah
http://www.life.umd.edu/emeritus/reveal/pbio/biome/lec35f1.html