Extended Data Fig. 8: Major and trace elements of KC19-7 and KC19-14.
From: Late Miocene Arctic warmth and terrestrial climate recorded by North Greenland speleothems
a, Selected elements associated with silicate weathering (Fe, Zr, Rb, Al, K), sea spray (Na) and colloidal soil transport (P, Y), sulphide oxidation (Cu, As, Zn, Pb), and prior calcite precipitation (PCP; Mg, Sr, Ba, U). Data standardised to Z-scores for comparison. Z scores calculated as standard deviation units of each time series (n = 1179), Z = (xi – μ / σ). b, Principal component 1 and 2 scores for the bulk calcite (excluding detrital-rich white layer). c, Principal component 1 and 2 scores for detrital-rich white layer. d, U-Pb ages (2-sigma uncertainty) on common depth scale plus proxies for enhanced incongruent calcite dissolution (Ba/Mg, normalised to the lowest value) and for prior calcite precipitation (Mg; values above/below ~920 ppm in red/blue). Grey bars show intervals of enhanced incongruent calcite dissoluation and reduced prior calcite precipitation during warm climates, inferred from prior calcite precipitation-corrected δ18O. e, ‘Sinclair Test’ for prior calcite precipitation enrichment of Mg and Sr, positive only when Mg exceeds ~920 ppm.
