7_sediment source - 7 Sediment source Can you Categorize...

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7. Sediment source Can you? Categorize sediment by the 4 main sources and identify sediments of different composition within each category Explain the presence of the carbon compensation depth (CCD) and demonstrate how to change its depth using sediment delivery. Lecture Outline Terrigenous or lithogenic sediment (see previous lecture) Cosmogenic sediment o Meteors o Nickel-iron spherules & silicate chrondrules. Authigenic sediment o Manganese nodules & crusts: MnO 2 (30%) & Fe 2 O 3 (20%), Copper, nickel & cobalt (2%).
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Unformatted text preview: Weathering, hydrothermal water, or runoff o Phosphorites: o Glauconite: • Biogenic sediment o Calcareous sediments = Foraminifera and Coccoliths (CaCO 3 ) o Siliceous sediments = Diatoms and Radiolaria (SiO 2 ) o Distribution controlled by production & dissolution Carbon compensation depth (CCD) Glossary Nickel-iron spherules Fecal pellets Silicate chrondrules Photosynthesizers Manganese nodules Silica Phosphorites Calcium carbonate Glauconite Sedimentation rate...
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  • Fall '10
  • IngridHendy
  • SILICATE, Sediment source, carbon compensation depth

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