Selected incompatible trace element ratios for zircon from the Upper Border Series, Layered Series, and Marginal Border Series, Sandwich Horizon (+UZc’), granophyres, Tinden sill, and Sydtoppen sill. Data are shown only for analyses that have been filtered by removing those with chemical evidence of inclusions (although an inclusion effect still remains in many samples). The arrows highlight trends for crystallization and incorporation of inclusions for reference. The light shading indicates analyses of Sandwich Horizon secondary zircon (110, 56) and zircon containing abundant thorite inclusions from Transgressive granophyre SEB87–211. (a–e) Th/U vs Nb/Yb. (f–j) Th/U vs Lu/Hf. (k–o) Yb/Dy vs Ce/Nd. Abbreviations: Ap = apatite, FC = fractional crystallization, Mnz = monazite.