Chemistry of ODP Hole 121-752B samples (Table 2), supplement to: Schuraytz, B C; O'Connell, S O; Sharpton, V L (1991): Data report: iridium and trace element measurements from the Cretaceous-Tertiary boundary, Site 752, Broken Ridge, Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 913-919

B C Schuraytz, S O O'Connell & V L Sharpton
Fourteen samples spanning a 2.5 m interval that includes the Cretaceous-Tertiary (K/T) boundary from Hole 752B near the crest of Broken Ridge in the eastern Indian Ocean, were studied in order to search for anomalous enrichments of iridium (Ir) and shock-metamorphosed quartz grains. No allogenic quartz grains >10 µm were observed, hence the presence of quartz containing diagnostic evidence of shock-metamorphism could not be confirmed. Two Ir anomalies of 2.2±0.6 and 2.0±0.4 parts per billion...
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