SULFUR SINKS AND ORGANIC-CARBON RELATIONSHIPS IN CRETACEOUS ORGANIC-RICH CARBONATES - IMPLICATIONS FOR EVALUATION OF OXYGEN-POOR DEPOSITIONAL-ENVIRONMENTS

A succession of Upper Cretaceous organic-rich carbonates and phosphorites in central Israel was used to study the relationships between sulfur sinks and organic carbon. In these sediments, deposited in oxygen-deficient and iron-poor environments, organic matter is the sink for the H2S obtained from sulfate reduction. The observed relationships between pyrite, organic sulfur, organic S/C ratio, and reduced sulfur isotopic composition provide valuable information on oxygen-poor depositional regimes. -from Authors