Heat production (time-corrected), and Th, U, and K concentrations igneous rocks through time. Solid lines indicate moving averages. (A) Australia (n = 896) (extracted from the Geoscience Australia portal, accessible via https://portal.ga.gov.au/), (B) global compilation; sans Australia (n = 43 910) (Gard et al., 2019). Radiogenic heat production was calculated after Rybach (1976) based on time corrected U, Th, and K concentrations, assuming an average crustal density of 2.7 g/cm³. Vertical gray bars show the approximate timings of supercontinents after Condie & Aster (2013). K, Kenorland; N, Nuna; R, Rodinia; G, Gondwana; P, Pangea.