The genesis of carbonate apatites

Ames, L.L.

doi:10.2113/gsecongeo.54.5.829

Cited by 160 publications

(63 citation statements)

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“…Pore water NH,+/P043-ratios witness this as well (Gaudette and Lyons, 1980) but do not yield turnover time data. ~0 ,~-removal mechanisms in carbonate environments include: (1) authigenic formation of apatite (Berner, 1974;Kitano et al, 1978;Gaudette and Lyons, 1980); (2) removal of P as organic coatings on carbonate grains (Suess, 1973;Wilson, 1979); (3) the direct precipitation of amorphous calcium phosphate (Martens and Harriss, 1970;Nathan and Lucus, 1976); (4) apatite replacement of calcium carbonate (Ames, 1959;Manheim et al, 1975). The sediments studied here were enriched in sedimentary P (Gaudette and Lyons, 1980).…”

Section: Standard D E V I a T~o N Of Triplicatesmentioning

confidence: 99%

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Hines¹,

Lyons²

1982

Mar. Ecol. Prog. Ser.

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Sulfate reduction rates, enumeration of sulfate-reducing bacteria, as well as pore water concentrations of NH,+ and titration alkalinity were determined for the upper 14 cm of sediments collected from 3 nearshore Bermudian environments: Coot Pond (LG), Mangrove Bay (MB) and Devil's Hole (DH). Sulfate reduction rates were rapld at LG and MB but slow at DH (-300 and 8.0 nmoles ml-' d-', respectively). Differences in source and deposition of organic matter caused rate variations. There was a linear relationship between sulfate reduction rates and sulfate-reducing bacteria. Pore water nutrient concentrations were low compared to clastic sediments. Nutrient regeneration rates, as calculated from organic matter C:N.P ratios, and sulfate reduction rates were used to calculate the turnover times of dissolved Pod3-and NH,+. Sediments subject to active bioturbation had NH,' turnover times 9 to 63 times less than those for non-bioturbated sediments

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Section: Standard D E V I a T~o N Of Triplicatesmentioning

confidence: 99%

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Hines¹,

Lyons²

1982

Mar. Ecol. Prog. Ser.

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“…I assume that at least part of the phosphorite is a replacement of carbonate grains and was washed in from a drowned carbonate platform (see Downhole Variation of the Calciturbidites). Precipitation of phosphorite, coupled with metasomatic replacement of carbonate by phosphorite, is common in areas of slow deposition just below the photic zone (Ames, 1959;Gulbrandsen, 1969 …”

Section: Metasomatismmentioning

confidence: 99%

Mesozoic Calciturbidites in Deep Sea Drilling Project Hole 416ARecognition of a Drowned Carbonate Platform

Schlager¹

1980

Initial Reports of the Deep Sea Drilling Project

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The Tithonian-Hauterivian section of Site 416 contains about 10 per cent limestone and marlstone in well-defined beds between shale and sandstone. Depositional structures, grain composition, and diagenetic fabrics of the limestone beds as well as their association with graded sandstone and brown shale suggest their deposition by turbidity currents below calcite-compensation depth. Carbonate material was initially shed from a shallow-water platform with ooid shoals and peloidal sands. Soft clasts of deep-water carbonate muds were ripped up during downslope sediment transport. Shallow-water mud of metastable aragonite and magnesium calcite was deposited on top of the graded sands, forming the fine tail of the turbidite; it has been subsequently altered to tight micritic limestone that is harder and less porous than Coccolith sediment under similar overburden. Abnormally high strontium contents are attributed to high aragonite contents in the original sediment. This suggests that the limestone beds behaved virtually as closed systems during diagenesis.Drowning of the platform during the Valanginian is inferred from the disappearance of the micritic limestones, the increase in abundance of phosphorite, of ooids with quartz nuclei, and of the quartz content in the calciturbidites. In Hauterivian time, the carbonate supply disappeared completely. The last limestone layers are lithoclastic breccias which indicate that erosion has cut into well-lithified and dolomitized deeper parts of the platform rather than sweeping off loose sediment from its top.Of all Tithonian sections recovered from the Atlantic, only the one at Site 416 contains abundant shallow-water debris and was deposited below the calcite-compensation depth. It is probably located on mid-Jurassic or older crust that had already deeply subsided and was close to the continental slope by Tithonian time. The other sites, located on younger crust, stood high on the flank of the mid-ocean ridge, and were consequently above the compensation level and beyond reach of shallow-water detritus shed down the continental slope.

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“…Studies on phosphorus in marine environments are concerned with the formation of calcium phosphate, because direct precipitation of apa tite and replacement of phosphate with car bonate in calcium carbonate occur in marine environments (KRAUSKOPF, 1967). AMES (1959) and SIMPSON (1964) found that the adsorption of phosphate ions on cal cium carbonate leads to the formation of apa tite. Seawater is supersaturated generally with respect to hydroxyapatite and carbonate fluor apatite (KRAMER, 1964).…”

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confidence: 99%

Uptake of phosphate ions by calcium carbonate.

1978

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(1) There are some differences in the mode of coprecipitation of phosphate ions with calcium carbonate formed from calcium bicarbonate solution between stirring and non-stirring (keeping still) the solution as follows: The amount of phosphate ions coprecipitated with calcium carbonate is larger when stirred than when kept still. In the keeping still system the amount of phosphate ions coprecipitated with calcite is approximately equal to that with aragonite, whereas in the stirring system the amount increases with increasing proportion of aragonite in calcium carbonate formed.

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The genesis of carbonate apatites

Cited by 160 publications

References 0 publications

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Mesozoic Calciturbidites in Deep Sea Drilling Project Hole 416ARecognition of a Drowned Carbonate Platform

Uptake of phosphate ions by calcium carbonate.

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The genesis of carbonate apatites

Cited by 160 publications

References 0 publications

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Biogeochemistry of Nearshore Bermuda Sediments. I. Sulfate Reduction Rates and Nutrient Generation

Mesozoic Calciturbidites in Deep Sea Drilling Project Hole 416ARecognition of a Drowned Carbonate Platform

Uptake of phosphate ions by calcium carbonate.

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Mesozoic Calciturbidites in Deep Sea Drilling Project Hole 416ARecognition of a Drowned Carbonate Platform