“…However, Eu concentrations can also be elevated by the erosion of Eu-enriched Archaean continental crust (Taylor and McLennan, 1985;Bohlar et al, 2004), and anomalies generated in vent systems may be diluted by mixing of seawater and hydrothermal fluids (Olivarez and Owen, 1991). Nonetheless, secular trends in the magnitude of Eu anomalies in large Superior-type IFs have historically been assumed to record variations in hydrothermal flux (e.g., Fryer, 1977a;Derry and Jacobsen, 1990;Danielson et al, 1992;Bau and Möller, 1993;Sreenivas and Murakami, 2005;Viehmann et al, 2015). This trend is clearly demonstrated through a compilation of chondrite-normalised Eu anomaly data (Eu CN /Eu CN * ) in IF spanning the Precambrian (Fig.…”