Figure 2: Mercury and organic carbon geochemistry of T-J interval, Muller Canyon, Nevada.
From: Mercury anomalies and the timing of biotic recovery following the end-Triassic mass extinction
Plots show (a) δ13Corg, (b) Hg, (c) Hg/TOC and (d) Δ199Hg for Muller Canyon, Nevada, along with lithology and key ammonites. Marker beds N3, N9 and N11 are after Guex et al.25 In panel b, error bars on Hg are 2 s.d. In panel c, error bars represent the combined error on Hg (2 s.d.) and TOC (1 s.d.) concentration measurements. In panel d, errors on individual Δ199Hg measurements are as reported in Supplementary Table 1 and represent either 2 s.e.m. of sample replicates or 2 s.d. of the JT Baker standard, whichever is higher (see the Methods for further explanation). The vertical grey bar in panel d is centred on Δ199Hg=0.00‰ and extends from −0.05‰ to +0.05‰. Samples for which the Δ199Hg values and associated error bars fall within the shaded grey region can be considered to have Δ199Hg values within experimental error of zero, and thus no measureable mass independent fractionation (MIF).
