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A detailed oxygen and carbon isotope study of the upper Maestrichtian-lower Paleocene section of Hole 516F from the Rio Grande Rise reveals that large isotopic anomalies are clearly associated with the Cretaceous/Tertiary boundary. Across the Cretaceous/Tertiary boundary, the total carbonate content reaches a maximum exceeding 80% before rapidly decreasing in covariance with the carbon isotope record. This strong covariance between δC and percent CaCO3 suggests either a significant reduction in primary productivity or a rapid shoaling of the calcium carbonate compensation depth. Importantly, the δC record 2 Ma after the Cretaceous/Tertiary boundary remained depleted in C by at least 0.5%0 compared to the late Maestrichtian.

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Detailed Stable Isotope and Carbonate Records from the Upper Maestrichtian-Lower Paleocene Section of Hole 516F (Leg 72) Including the Cretaceous/Tertiary Boundary