Fig. 6From: Biotic and environmental changes in the Panthalassa Ocean across the Norian (Late Triassic) impact eventPlots of Zr vs. Hf and Nb vs. Ta for chert (open red circles) and claystone (filled blue circles) samples. Compilation of modern deep-sea sediments (gray field; Plank and Langmuir 1998) are also shown for comparisonBack to article page