Alkaline sulphate fluids produced in a magmatic hydrothermal system

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Fig. 7: Comparison of various chemical thermometry calculations on alkaline sulphate fluids. Horizontal axis uses values derived from the Giggenbach (1988) K/Na thermometer. Quartz thermometers are from Truesdell (1984), K/Mg from Giggenbach (1988), and Δ 18 O SO4−H2O thermometer from Truesdell et al. (1977). Error bars for K/Mg and quartz variants are within point size. 36
Fig. 8: Plots showing effects of mixing between fluid types at Savo. Typical error bars are shown for an Eastern spring and the bicarbonate–sulphate spring, although in most cases errors are within point size. Arrows show mixing trends indicated by relative differences between Eastern and Crater Wall alkaline sulphate hot springs. More conservative elements (Cl − , Li, Na) show simple dilution trends, whereas Mg and HCO − 3 increase as the hydrothermal fluid mixes with cooler groundwater. Sulphate and Ca are buffered by anhydrite solubility. 37
Page 1 and 2: Alkaline sulphate fluids produced i
Page 3 and 4: low-chloride fluids which precipita
Page 5 and 6: timescales of a few minutes, and in
Page 7 and 8: 3 Sampling and Analytical Methods 3
Page 9 and 10: Comparison of SO 2− 4 as determin
Page 11 and 12: isotopes were measured relative to
Page 13 and 14: enrichment of both 18 O and D, and
Page 15 and 16: average meteoric water composition
Page 17 and 18: The thermometer discrepancies indic
Page 19 and 20: same process. Evidence of mixing in
Page 21 and 22: the addition of magmatic volatiles
Page 23 and 24: The Black Pool in the crater of El
Page 25 and 26: Dilution is the key process whereby
Page 27 and 28: Coleman, M.L. and Moore, M.P., 1978
Page 29 and 30: Petterson, M.G., Cronin, S.J., Tayl
Page 31 and 32: 9 Tables Table 1: Data for Crater W
Page 33 and 34: temperature >30°C) are shaded; the
Page 35: Fig. 5: 87 Sr/ 86 Sr versus δ 34 S

Alkaline sulphate fluids produced in a magmatic hydrothermal system

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