Other
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1605f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 9, pp.1605-1612
Other
3
Scientific paper
Fluoride analyses display downward decreasing pore water gradients in Peru shelf phosphatic muds that require diffusion from the overlying seawater into the sediment column and removal by reaction within the upper few tens of centimeters, presumably by incorporation into carbonate fluorapatite. The profiles can be modeled as first-order F-removal with rate constants of ~3 yr -1 and asymptotic F-concentrations deep in the cores of 35-45 M, almost one-half the seawater value. The integrated flux of fluoride from seawater into organic-rich shelf sediments in coastal-upwelling zones (phosphatic muds) yields a contemporaneous global F-burial of 0.54 × 10 10 mol-F yr -1 , about one-fifth the burial in other sinks (mostly carbonates and opal). The associated burial flux of phosphorus in shelf phosphorites is about 1.6 × 10 10 mol-P yr -1 , comparable to P-burial in the deep sea with organic matter (~1.4 × 10 10 mol yr -1 ) and biogenic carbonates (~1.4 × 10 10 mol yr -1 ). Thus phosphorite formation on the Peru shelf is a significant contemporaneous process.
Burnett William C.
Deakin Mark
Frohlich Philip N.
Jahnke Richard
Kim Kyung Hyuk
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