Thiadiamondoids as proxies for the extent of thermochemical sulfate reduction

► Thiadiamondoids are more reliable proxies for determining the extent of TSR reactions. ► Thiadiamondoids do not appear to be formed by back- reaction with H2S. ► The thermal stability of thiadiamondoids is between that of DBTs and diamondoids. ► The presence of polythiadiamondoids is also an indicator of TSR.