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Main Title Recent Biogenic Phosphorite: Concretions in Mollusk Kidneys.
Author Doyle, Larry J. ; Blake, Norman J. ; Woo, C. C. ; Yevich, Paul ;
CORP Author Environmental Research Lab., Narragansett, RI. ;Florida Univ., Gainesville. ;Geological Survey, Woods Hole, MA.
Year Published 1977
Report Number EPA/600/J-78/146;
Stock Number PB-299 468
Additional Subjects Kidneys ; Mollusca ; Inorganic phosphates ; Clams ; Physiology ; Shellfish ; Reprints ; Phosphate rock ; Mercenaria Mercenaria ; Argopecten irradians
Library Call Number Additional Info Location Last
NTIS  PB-299 468 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
Abstract 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.
Supplementary Notes 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 Journal article.
Title Annotations Reprint: Recent Biogenic Phosphorite: Concretions in Mollusk Kidneys.
PUB Date Free Form 28 Nov 77
Category Codes 6C; 57Z
NTIS Prices PC A02/MF A01
Primary Description 600/19
Document Type NT
Cataloging Source NTIS/MT
Control Number 323767606
Origin NTIS
Type CAT