EE BIOL 109 Lecture Notes - Lecture 14: Carbonate Compensation Depth, Manganese Nodule, Sea Level Rise
31 Dec 2017
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Lecture 13 continental shelf and deep sea. Biomass decreases sharply with depth deep sea habitat stressors. Biogenous (biological origins: calcareous caco3, siliceous sio2. Hydrogenous (precipitated from water) cosmogenous (outer space) terrigenous sediments river can contain nutrients, iron oxide/rust. Mostly from phytoplankton calcareous calcium carbonate shells i. e. foraminifera, coccolithophores: preservation depends on temp, ph, depth siliceous silicone dioxide shells i. e. diatoms, radiolarian, dissolves slow and is well preserved. Accu(cid:373)ulate rates (cid:448)aries, depe(cid:374)ds o(cid:374) : productivity reproduction of planktonic organisms/amount of pp, preservation rates less than 1 to 15 mm/1000 years, rates of deposition are small rate of accumulation also small. At this depth, rate of deposition of calcareous oozes = dissolution of calcium carbonate due to acidic waters. Below this depth, calcareous oozes do not accumulate/are not exported here shallo(cid:449)er (cid:449)aters/co(cid:374)ti(cid:374)e(cid:374)tal shelf does(cid:374)"t ha(cid:448)e this hydrogenous sediments sediments precipitated from sea water. Metalliferous sediments at spreading ridges resource limitation.
