Element contents, sulfur and oxygen isotopes, and molecular biomarkers of phosphatic crust samples from the Chimbote Platform of the shelf off Peru, supplement to: Arning, Esther T; Birgel, Daniel; Brunner, B; Peckmann, Jörn Ludwig (2009): Bacterial formation of phosphatic laminites off Peru. Geobiology, 7, 295-307

Esther T Arning, Daniel Birgel, B Brunner & Jörn Ludwig Peckmann
Authigenic phosphatic laminites enclosed in phosphorite crusts from the shelf off Peru (10°01' S and 10°24' S) consist of carbonate fluorapatite layers, which contain abundant sulfide minerals including pyrite (FeS2) and sphalerite (ZnS). Low d34Spyrite values (average -28.8 per mill) agree with bacterial sulfate reduction and subsequent pyrite formation. Stable sulfur isotopic compositions of sulfate bound in carbonate fluorapatite are lower than that of sulfate from ambient sea water, suggesting bacterial reoxidation of sulfide by...
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