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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Origins and pathways of deeply derived carbon and fluids observed in hot spring waters from non-active volcanic fields, western Kumamoto, Japan

Fig. 4

Biplot diagram between Ca2+ ratio and chloro-alkaline indices. a, b Plot diagrams compare for CAI-1 and CAI-2, respectively, three types of groundwaters from hot spring sites, High-Cl−, Low-concentration, and High-HCO3− fluids. Ca2+ ratio denotes proportion of calcium ion among four major cations (Na+, K+, Ca2+ and Mg2+) in milliequivalent concentrations

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