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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Original composition and formation process of slab-derived deep brine from Kashio mineral spring in central Japan

Fig. 4

Relationship between 3He/4He, 4He/20Ne, and Cl in water samples from the Kashio A and B wells. a Relationship between helium isotope ratio (3He/4He) and 4He/20Ne. The two solid curves indicate the mixing lines between the upper mantle and radiogenic components and air, respectively. Three gray dashed lines indicate the mixing between air and the supposed end-member containing the upper mantle component partially (10%, 20%, and 50%). For comparison, data from the previous studies of Arima, Takarazuka, and Ishibotoke are also plotted (Nagao et al. 1981; Sano and Wakita 1985; Matsumoto et al. 2003; Morikawa et al. 2005; Kusuda et al. 2014). b4He/20Ne versus Cl diagram. No linear relationship is observed between these variables

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