19_416M_Carbonate Precipitation Modes and Factories_handout

19_416M_Carbonate Precipitation Modes and Factories_handout...

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Modes of Carbonate Precipitation Abiotic Precipitates where biotic effects are negligible Biotically Induced Precipitates where the organism sets the process in motion, but where organismal influence cease after the initial step Biotically controlled Precipitates where the organism determines the location, beginning and end of the process. Key in 1
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Biotically Controlled Carbonate Producers 2
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Carbonate Factories Tropical Shallow Water ____________ w/low nutrients 30° N to 30°S latitude today Cool-Water _____________ precipitates rule (Heterotrophs dominate) Wide depth window High latitudes Mud-mound In situ precipitation of ________ carbonate Low light, high nutrients 3
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Factory I: Tropical Warm (>18°C), shallow seawater (< 100m) Clear, well-lit, well-circulated seawater _____________ can mediate/control carbonate precipitation Normal-to-elevated salinities for seawater Low nutrients (oligotrophic) Low net organic productivity 4
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CaCO 3
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Unformatted text preview: Production Light is basis of photosynthesis Much carbonate is formed as byproduct of photosynthesis (e.g., calcareous algae) 5 Factory II: Cool Water Great Australian Bight 6 Factory III: Mud Mounds 25-30 m high, Algeria 7 Example: Porcupine Mounds, IODP Exp. 307 8 Where is most marine carbonate produced?? 9 Carbonate Factories Differ in 1. 2. 3. Precipitation Modes Mineral Composition Depth range of production and growth potential Carbonate Rocks are records of their environments Carbonate factories Produce Sediments of _______ (clay to boulder) Sediments that can be ___________ upon formation Sediments that can be ________ or relatively ________ Sediments of both _______ and _______ origin These sediments and the rocks that they form can be used as indicators of past ____________ and ___________ This requires describing assemblages of sediments and relating them to their environments of origin...
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19_416M_Carbonate Precipitation Modes and Factories_handout...

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