δ13C and 87Sr/86Sr of phosphorites from the São Francisco Craton, Brazil: phosphogenesis and correlations

Azmy, Karem and Misi, Aroldo and Sanches, Andreia L. and Kaufman, Alan J. and Veizer, Ján and Powis, Kelli and Teixeira, João Batista G. (2006) δ13C and 87Sr/86Sr of phosphorites from the São Francisco Craton, Brazil: phosphogenesis and correlations. In: South American Symposium on Isotope Geology V, April 21–24, Punta del Este, Uruguay.

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Abstract

Phosphate accumulations in the São Francisco Craton are found in both the cratonic non-deformed strata, and in the Brasilia Fold Belt, to the west of the cratonic area. The deposits are stratigraphycally controlled and their formation is probably related to a widespread episode during the terminal Proterozoic Era (Cook and Shergold, 1986). These authors suggested that major phosphogenic event followed a period of glaciation, which “could produce a large volume of cold, nutrient-rich water, resulting in a major expansion of organic productivity in the photic zone following the glacial period”.

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