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Information pertinent to meteoritic contamination at the Cretaceous Tertiary (C/T) boundary, and other Ir-enriched layers, can be obtained from the study of contaminated formations in impact craters. Target-mixing considerations and volumetric estimates of Rochechouart breccias are combined with geochemistry of major and siderophile trace elements to evaluate how the chemistry of the preserved mixture of target rock-projectile evolved since it was deposited. Target and impact formations are characterized by a large scatter of their major element compositions. Si and Al are the least affected by the impact and/or post-impact events. Their overall fluctuation is less than 10%. Impact melts (E)...

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