Platinum-group element abundances in background samples and the K-T boundary interval from DSDP Hole 91-596 (Table 2), supplement to: Evans, Noreen J; Ahrens, Thomas J; Gregoire, D C (1995): Fractionation of ruthenium from iridium at the Cretaceous-Tertiary boundary. Earth and Planetary Science Letters, 134(1-2), 141-153

Noreen J Evans, Thomas J Ahrens & D C Gregoire
New data on Ru/Ir abundance ratios are presented for nonmarine (Hell Creek, Montana; Frenchman River, Saskatchewan) and marine Cretaceous-Tertiary boundary sites (Brazos River, Texas; Beloc, Haiti; DSDP 577 and DSDP 596). The Ru/Ir ratio varies from 0.5 to 1 within 4000 km of Chicxulub and increases to 2-3 at paleodistances (65 Ma) of up to 12,000 km from the impact site. For CI chondrites, Ru/Ir = 1.5. A ballistic model of ejecta cloud cooling and...
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