||Recent Biogenic Phosphorite: Concretions in Mollusk Kidneys.
Doyle, Larry J. ;
Blake, Norman J. ;
Woo, C. C. ;
Yevich, Paul ;
||Environmental Research Lab., Narragansett, RI. ;Florida Univ., Gainesville. ;Geological Survey, Woods Hole, MA.
Inorganic phosphates ;
Phosphate rock ;
Mercenaria mercenaria ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Phosphorite concretions have been detected in the kidneys of two widespread species of mollusks. Mercenaria mercenaria and Argopecten irradians, which have relatively high population densities. These concretions are the first documentation of the direct biogenic formation of phosphorite grains. The concretions are principally amorphous calcium phosphate, which upon being heated yields an x-ray diffraction pattern which is essentially that of chlorapatite. These concretions appear to be a normal formation of the excretory process of mollusks under reproductive, environmental, or pollutant-induced stress. Biogenic production of phosphorite concretions over long periods of time and diagenetic change from amorphous to crystalline structure, coupled with secondary enrichment, may account for the formation of some marine phosphorite deposits which are not easily explained by the chemical precipitation-replacement hypothesis.
||Pub. in Science, v199 p1431-1433, 31 Mar 78. Prepared in cooperation with Florida Univ., Gainesville, and Geological Survey, Woods Hole, MA.
|NTIS Title Notes
||Reprint: Recent Biogenic Phosphorite: Concretions in Mollusk Kidneys.
|PUB Date Free Form
||28 Nov 77
||PC A02/MF A01