IanR. Jonasson's research while affiliated with British Geological Survey and other places

... The Central African Copperbelt is a supergiant sediment-hosted stratiform copper deposit, which occurs in the Neoproterozoic Katangan basin of south-central Africa (Hitzman et al., 2010). Important Tonian Pb-Zn deposits exemplify by the Kholodninskoye deposit in the southern margin of the Siberian Craton (Leach et al., 2010) and by the Rosh Pinah ore province in southwestern Namibia (Frimmel et al., 2004) are restricted to continental rift basins that formed during the breakup of Rodinia (Fig. 13). Formation of these deposits was connected to circulation of metalliferous basinal brines within the rift-related sedimentary sequences (Chetty and Frimmel, 2000;Hitzman et al., 2010;Leach et al., 2010). ...

... In addition, hydrothermal fluids leaching the biogenic pyrite formed by microbial sulfate reduction (MSR) in sediment likely causes hydrothermal systems to have negative δ 34 S values of sulfide. The sulfate formed by MSR always have δ 34 S values higher than those obtained for seawater (Shanks and Niemitz, 1982;Peter and Shanks, 1992;Goodfellow and Franklin, 1993;Zierenberg et al., 1993;Böhlke and Shanks, 1994;Stuart et al., 1994aStuart et al., , 1994bZierenberg and Shanks, 1994;Petersen et al., 2004; Aoyama et al., 2014;Nozaki et al., 2021a). The hydrothermal fields in the Okinawa Trough have a wide range of fO 2 -fS 2 , sulfides (− 5.0‰ to +13.5‰; Lüders et al., 2001;Ueno et al., 2003;Aoyama et al., 2014;Kawasumi and Chiba, 2017;LaFlamme et al., 2018;Wang et al., 2020Wang et al., , 2023Yang et al., 2020a;Zhang et al., 2022) and fluids H 2 S δ 34 S values (− 0.2‰ to +12.6‰; Gamo et al., 1991;Chiba et al., 1992;Aoyama et al., 2014). ...