| Title | Isotopic Evidence for Calcite Formed from Steam-Heated Waters at the Broadlands-Ohaaki, Wairakei and Waiotapu Geothermal Systems, New Zealand |
|---|---|
| Authors | Simmons, S. F. |
| Year | 1991 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| 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. |