Fig. 5: Temporal changes in enrichment within the Eastern Indian Ocean Seamount Province.
From: Enriched mantle generated through persistent convective erosion of continental roots
a, (208Pb/204Pb)i versus (206Pb/204Pb)i of volcanics spanning the CHRISP8 and the IFZ41, coloured by age (n = 31). The fields for EM1, lamproites and kimberlites are from ref. 41, and another proposed EM1 composition (star) is from ref. 42. NHRL, Northern Hemisphere Reference Line; SA, South Africa b, (206Pb/204Pb)i of the above volcanics over time, coloured by ϵNdi (n = 30; data from refs. 8,41), with the EM1 field41 shown in pink. Linear regressions (n = 1,000 from weighted bootstrap resampling procedure; Methods) are shown in blue; the resulting samples yield an r2 range of 0.34–0.91, with a median of 0.71. The data support the hypothesis that convective SCLM removal enriches the suboceanic asthenosphere, driving the early peak and gradual decline of EM components.
