Extended Data Fig. 7: Modelling the μ of the Bermuda mantle source.
From: Sampling the volatile-rich transition zone beneath Bermuda
Modelled μ compositions that are necessary to produce Bermuda’s most radiogenic 206Pb/204Pb sample (B703) starting from the average composition of the silica-saturated, least radiogenic samples. B703 (target) and the average silica-saturated samples have been age-corrected to time of eruption (30 Myr ago). Each line corresponds to possible source ages and the necessary μ for that source to produce an erupted lava that corresponds to B703. t = 40 Myr (70 Myr ago) corresponds to the calculated source age for Bermuda assuming that Bermuda represents an isochron, with a minimum μ < 420 necessary. t = 80 Myr (110 Myr ago) corresponds both to the error of the Bermuda isochron and the age of the oceanic lithosphere around Bermuda. T = 170 Myr (200 Myr ago) corresponds to the rifting of Pangea and the opening of the Atlantic in the region of Bermuda. t = 550 Myr (580 Myr ago) corresponds to the ideal source age that can evolve the least radiogenic sample to the most radiogenic sample with a μ of 50 (the actual μ for B703). Ma, million years ago.
