Fig. 2: He isotope compositions of olivine in kimberlites.
From: Primordial neon and the deep mantle origin of kimberlites
3He/4He (expressed as ratio R normalised to the atmospheric ratio Ra) versus (a) 4He concentrations in olivine and (b) age of kimberlite emplacement for the samples from this study (only data acquired in Woods Hole), Sumino et al. 22 (S + 2006) and Tachibana et al. 39 (T + 2006). Each symbol represents analyses of the same sample. Error bars represent 1σ uncertainties. The 3He/4He ranges of MORBs unaffected by plume contributions1,15 and intracontinental alkaline mafic magmas49 are shown for comparison. The He isotope data of Igwisi Hills olivine from Brown et al. 40 completely overlap with our results.
