Element stratigraphy across the Cretaceous-Tertiary boundary in ODP Hole 119-738C, supplement to: Schmitz, Birger; Asaro, Frank; Michel, Helen V; Thierstein, Hans R; Huber, Brian T (1991): Element stratigraphy across the Cretaceous/Tertiary Boundary in Hole 738C. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 719-731

Birger Schmitz, Frank Asaro, Helen V Michel, Hans R Thierstein & Brian T Huber
Neutron activation analyses of iridium and other chemical elements were performed across a 1-m-thick, partly nonbioturbated, clay-rich interval at the Cretaceous/Tertiary boundary in ODP Hole 738C. The results show that the boundary interval holds one of the highest Ir enrichments (320 ng Ir/cm2) of all known Cretaceous/Tertiary boundary layers. Iridium concentrations are highest (18 ppb Ir, whole-rock samples) a few centimeters above the base of the clayrich interval and gradually tail off upsection. Compared with...
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