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- W2061443670 abstract "There is agreement among many authors that the most favourable conditions for the formation of phosphorite deposits occur in shallow, warm water, particularly between 30 and 300 m. A greater depth (200-1,000 m) has been suggested for the Phosphoria Formation by McKelvey et al. (1953), partly on the grounds that the “Challenger” Expedition reported nodules mainly from depths of 400 to 1,000 m. The final resting place of phosphorite nodules may, however, be in deeper water than that in which they formed. No rich, bedded phosphorites have been discovered on the present sea floor. The bathymetric distribution of phosphate-rich interstitial water in the ocean and basin sediments makes it appear unlikely that they would form at depths of over 300 m. Most of the phosphate-phosphorus is released from descending organic matter before a depth of 1,000 m is reached, and therefore, for a large accumulation of organic phosphorus to build up on the sea floor the sea must be considerably less than 1,000 m deep. If chemical precipitation or colloidal deposition direct from sea water is possible, this will also occur in fairly shallow water (Kazakov, 1937; Emery, 1960). A separate phosphatizing environment may exist in estuaries, with the likelihood of redeposition in the neighbouring shallow sea (Pevear, 1966). Economically important, rich, authigenic phosphorites, indicating ideal conditions for their formation, are likely to adhere strictly to these bathymetric ranges. Locally enriched interstitial waters, especially in restricted basins, may give rise to the formation of phosphatic nodules in deeper water, or in lagoons, but these are unlikely to assume any great importance." @default.
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- W2061443670 date "1967-10-01" @default.
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- W2061443670 title "Marine phosphorites as depth indicators" @default.
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