Ngawha geothermal field: hot springs
Northland (northern North Island), Nouvelle-Zélande
Other media
- Type
- Other medium
Geothermal field below a poorly permeable Cretaceous-Tertiary cap about 560 m thick, reservoir in fractured Mesozoic greywacke-argillite basement; very boron-rich fluids (up to about 100 mmol/kg) with Cl/B about 0.41; former Ngawha lake bed with mercury ore in its upper two to three metres. Jubilee (48 °C, pH 6.8, 81 mmol/kg B) fed mostly by deep fluid; Jupiter (38 °C, pH 8.1, 24 mmol/kg) diluted by groundwater at the same Cl/B.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −3.66 ± 0.03 ‰ | −3.68 / −3.64 ‰ | 2 | hot spring water Mean and standard deviation recalculated from 2 analyses, -3.68 to -3.64 (Jubilee -3.64; Jupiter -3.68). Replicates averaged before calculation: Jubilee -3.56 and -3.72; Jupiter -3.45 and -3.91. | Aggarwal et al. (2003), Precise and accurate determination of boron isotope ratios by mul… |
Deposits of the same type
Cite this page
IsoFind Atlas (2026). Ngawha geothermal field: hot springs, isotope signatures. https://www.isofind.tech/isotopes/en/sites/champ-geothermal-de-ngawha-sources-chaudes/ (accessed 2026-10-20).
@misc{isofind2026ngawhageothermalfieldhotsprin,
title = {Ngawha geothermal field: hot springs, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/champ-geothermal-de-ngawha-sources-chaudes/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20