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8. 9. 11. 3c: MARINE ENVIRONMENTS. Organic processes and organisms that modify sediments. Geographic location and plate tectonic setting. Transport agent and medium. Climate. Sedimentary environment. Sediments deposited. Continental margin/slope. Continental shelf. 10.
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8 9 11 3c: MARINE ENVIRONMENTS Organic processes and organisms that modify sediments Geographic location and plate tectonic setting Transport agent and medium Climate Sedimentary environment Sediments deposited Continental margin/slope Continental shelf 10 Organic reef Turbidity currents Deep sea
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Carbonate platforms are built by reef-building organisms that precipitate calcium carbonate as calcite aragonite. Coral reef Lagoon Open ocean Light Light Light Carbonate platform
Atoll formation: 1) Volcano, 2) reef forms, 3) volcano erodes
5 6 7 8 9 11 1 3 4 2 Quiz: MARINE ENVIRONMENTS 10
Diagenesis Process...turns sediment into sedimentary rocks Requires: pressure, temperature, fluids Most cements are Calcium Carbonate or Silica
Sedimentary Structures Features formed at time of deposition
Sedimentary Textures Clues to the history of the rock
Poorly sorted, coarse-grained Contact Well-sorted, fine-grained
Siliciclastic classification is based on grain size Coarse: boulders and gravel Medium: sand Fine: silt, mud, clay