“…(Kolb, 2014;Crotty et al, 2022) and the Fenris Unit in Schweizerland (Crotty et al, 2022). The supracrustal belts contain a diversity of metasedimentary lithologies including metapelite, marble, calc-silicate rocks and quartzite, as well as volcanic or shallow intrusive magmatic rocks, predominantly metabasalts (Hall et al, 1989;Kolb, 2014;Crotty et al, 2022;Poulsen, 2022). These lithologies are thought to have been deposited in interconnected basins in volcanic arc and back-arc basin settings at ca.…”