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Organic Matter in the Genesis of High-Island Atoll Peloidal Phosphorites: The Lagoonal Link
Jean Trichet, Abdelouahad Fikri
Our data were obtained from (1) elemental analysis of bulk organic matter associated with atoll phosphorites as well as of their acid-soluble and humic compounds, (2) Rock-Eval pyrolysis of bulk organic matter and, (3) chromatographic analyses of hydrocarbons and fatty acids.
The conclusion of this study is that, whatever the source of phosphorus (guano, supermarine reef organisms, marine waters, or possibly endo-upwelling), phosphatogenesis proceeded through growth of lagoonal cyanobacterial biomass, the phosphorus of which being partly recycled during subsequent diagenetic steps. If closed lagoons are indeed favorable for preservation of organic matter and, therefore, of phosphorus, a closed morphology is not a prerequisite for the course of such processes.
Similar d13C values in apatite
CO3 and in total dissolved organic carbon in recent microbial
atoll deposits suggest that such deposits may be precursors to such peloidal
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