Mineralogical and Microbial Characteristics of an Acid-Derived Siliceous Sinter from a Thermal Outflow at Parariki Stream, Rotokawa Geothermal Field, New Zealand
- Location
- Rotokawa, New Zealand; Taupo Volcanic Zone
- Conference
- New Zealand Geothermal Workshop
- Year
- 2004
- Session
- Extremophiles and Silica Deposition
- Language
- English
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Abstract
Unusual deposits of siliceous sinter form around hot (>75oC) vents on a thermal outflow at Parariki Stream, in the Rotokawa geothermal field. The sinter forms subaerially on pumice clasts and pine cones from silica rich acid-sulphide-chloride waters (pH 2.3). The main mineral phase is noncrystalline opal-A silica with full width at half maximum intensity (FWHM) values of 1.34-1.42
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