A Piece of the KT Bolide?

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Bolides, Craters: Scaling, Cretaceous-Tertiary Boundary, Iridium, Nickel

Scientific paper

A heavily altered lithic fragment of probable meteoritic origin has been recovered from sediments of the Cretaceous/Tertiary (KT) boundary from Deep Sea Drilling Project (DSDP) Site 576. DSDP Site 576 is located in the western North Pacific (32 degrees 21.4'N, 164 degrees 16.5'E) and sediments recovered at this site record a nearly complete sequence of pelagic clay sedimentation from Late Cretaceous to Recent. At 65 Ma this site was located in the central region of the ancestral Pacific basin approximately 9,000 km due west of the Chicxulub impact structure in the Yucat_n. The KT boundary has now been identified in two cores at this site recovered from Holes 576 and 576B. The KT boundary is characterized by anomalous Ir concentrations, as high as 13 ng/g, coincident with a trace mineral assemblage dominated by shocked quartz and Ni-rich magnesioferrite spinel. At Site 576, anomalous Ir (>1 ng/g) occurs across nearly 100 cm of section, but a sharp peak with the trace minerals is more localized. In Hole 576, FWHM for the Ir anomaly is ~10 cm. The breadth of the Ir anomaly has been attributed to bioturbation and possibly chemical diffusion within these homogenous pelagic clays.

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