Alkaline sulphate fluids produced in a magmatic hydrothermal system

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10 Figures Fig. 1: Map of Savo Island showing location of major thermal areas, streams and some outlying spring samples. Thermal areas (springs, steaming ground, fumaroles and ground 32
temperature >30°C) are shaded; the major hot spring areas (Eastern and Crater Wall springs) are marked by text. Grid references are for UTM zone 57L. Inset shows major tectonic features in the southwest Pacific. Fig. 2: Anion ternary with arrow showing Savo springs compared to general evolution of fluids in a magmatic hydrothermal system from initial magmatic sulphate dominated fluids to rock-buffered, neutral chloride “mature” fluids. Bicarbonate and steam-heated acid sulphate waters occur in the near surface and peripheral parts of hydrothermal system. Diagram after Giggenbach (1997). 33
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: 9 Tables Table 1: Data for Crater W
Page 35 and 36: Fig. 5: 87 Sr/ 86 Sr versus δ 34 S
Page 37 and 38: Fig. 8: Plots showing effects of mi

Alkaline sulphate fluids produced in a magmatic hydrothermal system

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