Fig. 3
From: Mantle-derived fluids in the Nankai Trough Kumano forearc basin
3He/20Ne vs. 4He/20Ne (a) and 3He/4He vs. 4He/20Ne diagrams (b). In both diagrams, all samples from Exp 348 (black squares) and samples #1700 and #1850 from Exp 338 (blue open diamonds) plot on a mixing line between air and a mantle-derived fluid with 3He/4He composition of 2.40 ± 0.10 Ra (see text). Hyperbolic lines on diagram b indicates mixing between air and different reservoir endmembers with 4He/20Ne = 1000 and 3He/4He = 0.02 (crustal), 2.4 and 3.4, respectively. Numbers denote sample depth