Fig. 4: Profiles of Bawangzhuang (Upper, BWZ), Maquancun (Middle, MQC), and Yan56 (Lower) sections.
From: Volcanic fertilization of Late Triassic lacustrine algal blooms
a, k, u Ratios of zirconium to aluminum (Zr/Al, ppm/%); b, l, v Ratios of potassium to aluminum (K/Al, %/%); c, m, w Ratios of phosphorus to aluminum (P/Al, ppm/%); d, n, x Ratios of total iron to aluminum (Fe/Al, %/%); e, o, y Ratios of total organic carbon to total nitrogen (C/N, mol/mol); f, p, z Bulk nitrogen isotope (δ15Nbulk, ‰); g, q, aa Total organic carbon content (TOC, wt%); h, r, ab Ratios of total organic carbon to phosphorus (Corg:P, mol/mol); i, s, ac The enrichment factor of vanadium (VEF); j, t, ad Organic carbon isotope (δ13Corg, ‰); VA Volcanic ash, WVA water-borne volcanic ash-rich interval, AVA airborne volcanic ash-rich shale interval, VAD volcanic ash-devoid shale interval. Zr/Al (a, k, u), K/Al (t), TOC (g, q, aa), and Corg:P (a, b) data from refs. 23,67. C/N (y), δ15Nbulk (z), and δ13Corg (ad) data from ref. 68, VEF (ac) data from ref. 55. The lithologic columns are from refs. 67 and 23.
