Figure 6
Comparison between helium isotopes (3He/4He) and strontium isotopes (87Sr/86Sr) at PdF. (a) 87Sr/86Sr vs. 3He/4He. Dark grey field for published data from lavas at PdF37. CIR for the Central Indian Ridge composition72. Same legend than in Fig. 1 for our samples. (b) Time evolution of 3He/4He and 87Sr/86Sr since 1931 from lavas. 3He/4He datasets before 2002 from previous studies36,37. 3He/4He after 2002 acquired in this study. 87Sr/86Sr dataset completed37 in this study for products emitted after 2002. New data are highlighted by filled circles. The meaning of σerror and σreplicates is detailed in the Methods and the caption of Fig. 2.
