Sulphur isotopic evolution of Neoproterozoic-Cambrian seawater: new francolite-bound sulphate dS data and a critical appraisal of the existing record

Abstract

Francolite-bound sulphate sulphur isotope compositions from the 570F 20 Ma Doushantuo Formation are used to constrain seawater dS during the late Neoproterozoic. Phosphorites of the lower ore have dS compositions between 32.3xand 37.8x, averaging 36.1x, dC values between 4xand 1x, and do not exhibit anomalous cerium depletion. By contrast, phosphorites of… (More)

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