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Figure 4 | Geochemical Transactions

Figure 4

From: Geochemical evidence for the link between sulfate reduction, sulfide oxidation and phosphate accumulation in a Late Cretaceous upwelling system

Figure 4

Ternary plot of iron, sulfur and organic carbon according to Dean and Arthur [ 50 ] . The fine dashed line represents a C/S ratio of 2.8 which is indicative for samples deposited under normal marine conditions [36]. The coarse dashed line results from the measured data on samples from the OSM with a mean C/S ratio of 6.5. The different facies types are marked with elliptical labels. The OSM samples are separated in an upper part of the section labeled as OSM and a lower part of the section labeled “Base of OSM”. The fine dotted line (100% pyrite) represents conditions where all reactive iron in the sediment would be present as pyrite. With fine dotted lines different oxygenation levels are marked according to Ross and Bustin [51].

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