Extended Data Fig. 1: Stable isotope and Element-to-Ca ratio cross-plots for PTB brachiopods.
From: Permian–Triassic mass extinction pulses driven by major marine carbon cycle perturbations
Grey symbols show data from solution-based analyses of PTB brachiopods. Panel a additionally shows the Al/Ca and B/Ca composition of matrix (void cement) material (n = 3, ±2 s.d.) and modern brachiopods (n = 3, ±2 s.d.; based on measured values for Magellania venosa, Liothyrella neozelandica and Pajaudina atlantica) for comparison. Matrix is highly depleted in B/Ca, with variable Al/Ca. Recent brachiopods are highly variable in both B/Ca and Al/Ca. Elemental ranges (Sr, Mn, Mg and Fe) for modern brachiopods shown in panels g and h are based on data from ref. 57.
