Phanerozoic variation in dolomite abundance linked to oceanic anoxia

Abstract The abundance of dolomitic strata in the geological record contrasts with general rarity locations where dolomite forms today, a discrepancy that has long posed problem for their interpretation. Recent culture experiments show can precipitate at room temperature, raising possibility many ancient dolomites may be syngenetic origin. We compiled large geodata set secular variations Phanerozoic, coupled compilations genus richness marine benthic invertebrates and sulfur-isotope carbonates. These data is negatively correlated to diversity, four peaks occurring during mass extinctions. Dolomite also correspond rapid increase composition (δ34S), an indicator enhanced sulfate reduction, anoxic oceans. results confirm Phanerozoic were closely linked changes both turn related oceanic redox conditions.