Fig. 5From: Biotic and environmental changes in the Panthalassa Ocean across the Norian (Late Triassic) impact eventPlots of Al vs. Ti, Nb, Ta, Th, K, and Rb for the chert samples. Ti/Al, Nb/Al, Ta/Al, and Th/Al ratios are identical to those of average UCC (Rudnick and Gao 2014), whereas K/Al and Rb/Al ratios are significantly higher than those of UCCBack to article page