Response to comment on “Reexamination of 2.5-Ga ‘whiff’ of oxygen interval points to anoxic ocean before GOE”
Sarah P. Slotznick, Jena E. Johnson, Birger Rasmussen, Timothy D. Raub, Samuel M. Webb, Jian‐Wei Zi, Joseph L. Kirschvink, Woodward W. Fischer
Abstract
Sedimentological, textural, and microscale analyses of the Mount McRae Shale revealed a complex postdepositional history, previously unrecognized in bulk geochemical studies. We found that metal enrichments in the shale do not reside with depositional organic carbon, as previously proposed by Anbar et al ., but with late-stage pyrite, compromising claims for a “whiff” of oxygen ~50 million years before the Great Oxygenation Event.
Topics & Concepts
Sedimentary depositional environmentAnoxic watersOil shalePyriteGeologyOxygenGeochemistryPaleontologyOceanographyChemistryStructural basinOrganic chemistryPaleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis