Alkaline sulphate fluids produced in a magmatic hydrothermal system
Alkaline sulphate fluids produced in a magmatic hydrothermal system
Alkaline sulphate fluids produced in a magmatic hydrothermal system
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temperature >30°C) are shaded; the major hot spr<strong>in</strong>g areas (Eastern and Crater Wall spr<strong>in</strong>gs)<br />
are marked by text. Grid references are for UTM zone 57L. Inset shows major tectonic<br />
features <strong>in</strong> the southwest Pacific.<br />
Fig. 2: Anion ternary with arrow show<strong>in</strong>g Savo spr<strong>in</strong>gs compared to general evolution of<br />
<strong>fluids</strong> <strong>in</strong> a <strong>magmatic</strong> <strong>hydrothermal</strong> <strong>system</strong> from <strong>in</strong>itial <strong>magmatic</strong> <strong>sulphate</strong> dom<strong>in</strong>ated <strong>fluids</strong> to<br />
rock-buffered, neutral chloride “mature” <strong>fluids</strong>. Bicarbonate and steam-heated acid <strong>sulphate</strong><br />
waters occur <strong>in</strong> the near surface and peripheral parts of <strong>hydrothermal</strong> <strong>system</strong>. Diagram after<br />
Giggenbach (1997).<br />
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