Weathering and precipitation after giant meteorite impact of Cr, Mn, Fe and Ni in K-T boundary clays from Stevns Klint

Abstract

Cr, Mn, Fe and Ni K-edge XANES and EXAFS spectra were measured on K-T boundary clays from Stevns Klint in Denmark. According to XANES spectra and EXAFS analyses, the local structures of Cr, Fe and Ni in K-T boundary clays is similar to Cr₂O₃, FeOOH and Ni(OH)₂, respectively. On the other hands, Mn has a local structure like MnCO₃ with divalent state.