Chapter 8 Sedimentary Rocks Part2 u Types of sedimentary rock u Sedimentary structures.
SEDIMENTARY ARCHIVES Sedimentary Structures Sole marks.
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SEDIMENTARY ARCHIVES edimentary Structures ole marks
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Transcript of SEDIMENTARY ARCHIVES Sedimentary Structures Sole marks.
SEDIMENTARY ARCHIVESSedimentary Structures
Sole marks
SEDIMENTARY ARCHIVESSedimentary Structures
Flute casts
SEDIMENTARY ARCHIVESSedimentary Structures
Tool marks
SEDIMENTARY ARCHIVESSedimentary Structures
Flame Structures
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Load structures
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Mudcracks
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Planar Cross-beds
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Trough Cross-beds
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Oscillation ripples
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Tool marks
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Fossils
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Fossils
SEDIMENTARY ARCHIVESSedimentary Structures
Geopetal Structures or Which Way is UP?
Raindrop Impressions
SEDIMENTARY ARCHIVESInterpretation of Sedimentary Rocks
Provide information about conditions in and near the site of deposition
Such as: source area from compositionamount of transport erosion
Qtz vs. Feldspar (clay and ironcompounds) vs FerromagnesiansImmature vs mature
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
"Systems of classification are not hatracks, objectively presented to us by nature. They are dynamic theories developed to express particular views..."
Stephen Jay Gould
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
TEXTURE
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
Quartz Arenite
>90% Quartz
Cement: silica calcite
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
Feldspathic AreniteArkose
>25% Feldspar Granitic source Remainder is quartz
Cement: clay calcite iron oxides
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
Lithic AreniteGreywacke
>33% rock fragments Immature sandstone Poorly sorted, angular Remainder is quartz,
feldspar Cement: very little mostly clays
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
CompositionCarbonate rocks consist of limestone and dolostone. The minerals present in each are: Limestone
Calcite Aragonite
Dolostone Dolomite
SEDIMENTARY ARCHIVESClassification of Sedimentary RocksCarbonates
SEDIMENTARY ARCHIVESClassification of Sedimentary RocksCarbonates
Most of marine originDirectly or indirectly related to biological processes
Skeletal remains may be visibleCan be evaporites
Changes in water temp., alkalinity, CO2 conc.Clear, shallow tropical waters
SEDIMENTARY ARCHIVESClassification of Sedimentary Rocks
Carbonates
Characteristics of most marine carbonate environments: Warm water Tropical climate (30 ° N - 30 ° S of equator) Shallow water (less than 200 m deep) Clear water (low to no terrigenous input) Sunlight required for photosynthesis by algae
