sedimentary rocks - exploreiowageology.orgchemical sedimentary rocks • limestone • dolostone •...
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Sedimentary Rocks
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Sedimentary Rock Types
Clastic • Breccia and
Conglomerates • Sandstone• Shale
Chemical• Limestone• Dolostone• Evaporites• Chert
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Clastic
• Breccia and Conglomerates • You Breccia!
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Conglomerates
• Coarse-grained• Cemented
• Assemblage of particles (Rounded!!) • Contained within matrix (fine-material)
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Breccia
• Coarse-grained• Cemented
• Assemblage of particles (Angular!!!) • Contained within matrix (fine-material)
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Sandstone
• Quartz• Silica-rich
• Arkosic• Feldspar-rich
• Wacke• Mud-rich
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Quartz Sandstone
• X > 90% quartz• Resistant to weathering• EOD
• Beach• Desert
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Arkose Sandstone
• X > 25% Feldspar• Coarse angular grains• Reddish / Pinkish• EOD
• New an igneous source
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Wacke Sandstone
• Greywacke• X > 15% clay/mud• Dark to greenish• EOD
• Turbidity currents
• Also may contain feldspar and abundant quartz particles
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Shale
• Fine-grained• Fissile to massive• Splitting• EOD
• Energy?
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Chemical Sedimentary Rocks
• Limestone• Dolostone• Evaporites• Chert
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Limestone
• Biochemical processes• Weathered biologic material (shells, coral, algae)• CaCO3, broken down and deposited on the sea-floor• Compaction • Presto, a Varity of Limestone
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Coquina
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Dolostone
• Chemically altered limestone• Calcium is partially replaced by Magnesium
• CaMg(CO3)2• Form by
• Magnesium-rich brine • Reactions between fresh and sea water
environments.
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Chert
• Silica• Types
• Layers• Nodules
• Occur often within limestone• No one has explained how it is precisely
formed, Yet!• Flint
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Evaporites
• Rock salt• Rock gypsum
• Crystalline structure