Early diagenetic constraints on Permian seawater chemistry from the Capitan Reef

The Capitan Reef Complex in West Texas is famous for its high prevalence of early marine cements, unusual a Phanerozoic platform, leading some to suggest that Precambrian styles carbonate sedimentation enjoyed Permian encore. Here, we use patterns stable Ca, Mg, C and S isotopes better understand the environmental driver(s) enigmatic cementation. We find calcite most enriched 44Ca has ?34S values approach inferred composition seawater sulfate. Microbial sulfate reduction pore fluids must have been spatially temporally coincident with recrystallization primary phases, such substantial 34S-enriched was incorporated into diagenetic under relatively closed-system conditions. Moreover, magnitude 34S-enrichment carbonates relative strongly influenced by local conditions, fluid-buffered shelf, reef, upper slope preserving more seawater-like isotope ratios than sediment-buffered lower slope. Some samples are far those from modern sites similar depositional environments, possibly responding specific combinations sedimentary parameters (e.g., grain size, porosity, organic matter rain rate). Additionally, concentration Delaware Basin might slightly levels, extensive isotopic evolution waters during recrystallization. Based on data numerical model recrystallization, one driver seafloor cement precipitation water column [Ca2+]:[SO42?] ratio somewhere between 1 seawater.