Extended Data Fig. 2: Endmember mixing models for sulfur, oxygen, and carbon isotopic signatures. | Nature Geoscience

Extended Data Fig. 2: Endmember mixing models for sulfur, oxygen, and carbon isotopic signatures.

From: Deep CO2 release and the carbon budget of the central Apennines modulated by geodynamics

Extended Data Fig. 2

δ18O(SO42−) plotted against δ34S for (a) winter samples and (b) summer samples. Ternary diagram illustrating the proportion of measured DIC, SO42−, and Ca2+ concentrations relative to endmember weathering acids for (c) winter samples and (d) summer samples. River samples are colored by the measured δ34S signature. (a, b) Samples are colored by surface lithology (carbonate, mixed, and siliciclastic) and by catchment (Aterno-Pescara or Tevere River). River and spring samples are illustrated as circle and x symbols, respectively, and the numbered springs correspond with sampling locations given in ref. 21. Endmember isotopic signatures for pyrite and evaporites are given in ref. 21.

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