Isotopic Evidence for Calcite Formed from Steam-Heated Waters at the Broadlands-Ohaaki, Wairakei and Waiotapu Geothermal Systems, New Zealand
- Location
- Taupo Volcanic Zone; Waiotapu, New Zealand; Wairakei, New Zealand; Ohaaki, New Zealand; Broadlands, New Zealand
- Conference
- New Zealand Geothermal Workshop
- Year
- 1991
- Session
- Geochemistry
- Language
- English
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Abstract
Oxygen isotopes in hydrothermal calcite (and aragonite) from at C range from 4.2 to 18.5 per mil and indicate equilibration with shallow steam-heated waters. By contrast, oxygen isotopes in hydrothermal calcite at C range from 1.0to 7.4 per mil and indicate equilibration with deeply derived chloride waters. Isotopic data from Wairakei and Waiotapu show similar trends by which equilibration with steam-heated or chloride waters are distinguished. Such distinctions help understand the origin of hydrothermal calcite in both geothermal systems and hydrothermalore deposits.
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