Supplementary material. SM1: Description of analytical setup for lead isotope ratio measurements of sulphides from Phalaborwa using Secondary Ion Mass Spectrometry (SIMS) at the NORDSIMS facility, Swedish Museum of Natural History, Stockholm, Sweden. SM2: Description of analytical setup for sulphur isotope ratio measurements of sulphides from Phalaborwa using Secondary Ion Mass Spectrometry (SIMS) at the NORDSIMS facility, Swedish Museum of Natural History, Stockholm, Sweden. SM3: Description of analytical setup for sulphur extraction and isotopic measurement of bulk rock samples using dual inlet isotope ratio mass spectrometry (DI-IRMS) at the University of Maryland, U.S.A. SM4: Description of analytical setup for sulphur isotope measurements of S of bulk rock samples using an Elementar Vario Isotope Cube elemental analyzer coupled in continuous flow mode to an Isoprime mass spectrometer (EA-CF-IRMS) at the University of Queensland, Brisbane, Australia.
Table SM1. Lead and sulphur isotopic compositions of Phalaborwa sulphides (lab: Swedish Museum of Natural History; NORDSIMS: SIMS).
Table SM2. Sulphur isotopic compositions of Phalaborwa bulk rocks (lab: University of Maryland: Dual inlet isotope ratio mass spectrometry: DI-IRMS).
Table SM3. Sulphur isotopic compositions of Phalaborwa sulphide separates (lab: University of Queensland: Elemental analyser coupled in continuous flow mode to an Isoprime mass spectrometer: EA-CF-IRMS).
Table SM4. Trace element concentrations (ppm) for average phoscorite, banded carbonatite and transgressive carbonatite.
