Sedona, AZ

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(No Transcript)
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Sedona, AZ Ryan Conlon
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Sedona, AZ Vanessa Lyons
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CHEMICAL SEDIMENTARY ROCKS
Typically consist of interlocking minerals
crystallizing upon precipitation from seawater.
LIMESTONE
Composed of Calcite (CaCO3) Comprise 10-15 of
all sedimentary rocks. CaCO3 precipitates in warm
water.
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CHEMICAL SEDIMENTARY ROCKS
LIMESTONE
CaCO3 precipitates in warm water. Related to the
solubility of CaCO3. CO2 content goes down as
water temperature rises. CaCO3 is more soluble at
cold temperatures in ocean. Agitation of water
also drives off CO2 making CaCO3
precipitate. Aquatic plants remove CO2 so more
CaCO3 precipitates. Most chemical carbonates
precipitate when all 3 work.
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CHEMICAL SEDIMENTARY ROCKS
LIMESTONE
Grand Bahamas Banks Area of oolite production
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CHEMICAL SEDIMENTARY ROCKS
EVAPORITES
Precipitate from sea water. Include
Gypsum Halite Sylvite Limestone
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Dolores River Paradox Valley, CO
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CHEMICAL SEDIMENTARY ROCKS
EVAPORITES
Typically found only in arid climates. White
Sands National Monument, NM (gypsum) Subsurface
salt deposits found in Colorado-Utah Michigan G
ulf Coast
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CHEMICAL SEDIMENTARY ROCKS
Paradox Valley, Colorado
White Sands National Monument, NM
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CHEMICAL SEDIMENTARY ROCKS
EVAPORITES
Salt Domes
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CHEMICAL SEDIMENTARY ROCKS
DOLOMITE
Composed of the mineral dolomite
(Ca,Mg(CO3)2). Similar to limestone in
appearance. Not really exactly sure how it is
deposited.
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CHEMICAL SEDIMENTARY ROCKS
CHERT
Composed largely of silica (SiO2). Most are
inorganic. Precipitate from SiO2-rich
waters. Can occur as nodules. Cavities in
limestone or dolomite fill with silica.
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ORGANIC SEDIMENTARY ROCKS
Derived from living organisms. Principally
limestone, chert and peat (some coals).
Radiolarian
Diatom
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ORGANIC SEDIMENTARY ROCKS
LIMESTONE
Composed of Calcite (CaCO3). Originate in warm,
marine environments. Organisms extract Ca2 and
CO2 from water to make skeletons. Upon death,
skeletal material accumulates forming LIMESTONE.
Most limestones form in shallow waters on
continental shelves in equatorial regions. Can
also form in deep water.
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LIMESTONE
Fossiliferous Limestone
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LIMESTONE
Lithographic Limestone or Micrite
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LIMESTONE
Coccolith
Chalk
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CHERT
Can also be produced by organisms. From skeletons
of radiolarians and diatoms.
Radiolarians
Diatoms
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PEAT
An organic sedimentary rock formed from plant
debris. Accumulates in O2-poor swamps and
bogs. With addition of heat and pressure can form
coal. Peat Lignite Bituminous Anthracite
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North American Coal
Developed in two time periods Pennsylvanian
280 million years ago. Formed mostly in
Appalachian region. Cretaceous-Tertiary 75
million years ago. Formed mostly in Rocky
Mountain region.
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North American Coal