Fig. 3: Schematic diagram highlighting fluctuating C-S-Fe-P systematics during deposition of eutrophic Section A and oligotrophic Section B.
From: Dynamic redox and nutrient cycling response to climate forcing in the Mesoproterozoic ocean
A Highly euxinic intervals in Section A experienced more intense runoff and organic matter burial. B Weakly euxinic intervals in Section A were driven by a relatively decreased riverine influx of sulfate and phosphate. C Deposition of Section B occurred within a ferruginous oxygen minimum zone (OMZ), with relatively increased aeolian inputs and upwelling under arid conditions promoting an expansion of the OMZ. D Deposition of Section B occurred beneath the ferruginous OMZ, where iron (oxyhydr)oxide minerals deposited under dysoxic bottom waters. A lower aeolian influx and upwelling limited the spatial development of the OMZ. Relative size of arrows indicates different flux intensities. Orange triangle indicates approximate depositional position for each scenario. Dashed lines indicate lower and/or more uncertain fluxes. TOC: total organic carbon.
