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Coccoliths calcium deposition

Second in importance to the sedimentary PIC flux are the detrital remains of coccol-ithophorids, a genus of phytoplankton. As shown in Figure 15.1b, these plants deposit calcium carbonate in plates (about 50 per cell) that overlap to create an external shell. An individual coccolithophorid will create and shed these plates on a continual basis at rate of about 1 per hour. The plates also separate from each other after death of the plant, especially if the detrital remains fell into waters that promote dissolution. These plates are referred to as coccoliths and have the crystalline structure of the mineral calotte. [Pg.375]

Lowenstam and Weiner (1989, pp. 8-11, table 2.1) clearly show that carbonates dominate in biomineralization. They even occur in plants and fungi. The volume percent of limestone and marbles is well documented from the Precambrian to the present. Whether these rocks are inorganic precipitates or festooned with fossils, many of the living creatures had biomineralized with calcium carbonate, is usually clear. Indeed, some strata are composed entirely of calcium carbonate shells. We present examples of carbonate mineral deposition in cyanobacteria, corals, coccoliths, foraminifera, mollusks, echinoids, and the arthropods. [Pg.4000]


See other pages where Coccoliths calcium deposition is mentioned: [Pg.408]    [Pg.48]    [Pg.103]    [Pg.172]    [Pg.50]    [Pg.38]    [Pg.57]    [Pg.70]    [Pg.805]    [Pg.470]   
See also in sourсe #XX -- [ Pg.597 ]

See also in sourсe #XX -- [ Pg.597 ]

See also in sourсe #XX -- [ Pg.6 , Pg.597 ]




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