Extended Data Fig. 6: Pb-isotope models for the Bermuda mantle source.
From: Sampling the volatile-rich transition zone beneath Bermuda
a, b, 206Pb/204Pb–207Pb/204Pb and 206Pb/204Pb–208Pb/204Pb plots of Bermuda samples with measured values and age-corrected values (see legend). HIMU65 and Eastern Azores lavas81 are plotted for illustration. Azores MAR, Average NMAR and Iceland MAR end members (GEOROC database) are presented along with their linear regression, the Atlantic array. R3 corresponds to the measured value of sample B703, at t3 = 0 (today). ss, silica-saturated; su, silica-undersaturated. c–f, Monte Carlo results derived from equation (1) for R1 values falling on the Atlantic array. Azores MAR, Average NMAR and Iceland MAR end members are presented at their respective model values. μ = 238U/204Pb, Ω = 232Th/204Pb, κ = 232Th/238U. μ and Ω values of Bermuda silica-undersaturated lavas are presented: dashed blue line, average; solid blue lines, ± 1 s.d.
