Ngawha geothermal field: wells
Northland (northern North Island), Nouvelle-Zélande
Groundwater
- Type
- Groundwater
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. Wells 2, 9, 12, 13 and 18 (97 to 180 °C, pH 7.6 to 7.7, 86 to 102 mmol/kg B).
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −3.47 ± 0.16 ‰ | −3.56 / −3.18 ‰ | 5 | geothermal well fluid Mean and standard deviation recalculated from 5 analyses, -3.56 to -3.18 (Ngawha 2 -3.56; Ngawha 9 -3.51; Ngawha 12 -3.53; Ngawha 13 -3.18; Ngawha 18 -3.56). Replicates averaged before calculation: Ngawha 2 -3.52 and -3.60; Ngawha 9 -3.54 and -3.48; Ngawha 12 -3.70 and -3.35; Ngawha 13 -3.24 and -3.11; Ngawha 18 -3.80 and -3.32. | Aggarwal et al. (2003), Precise and accurate determination of boron isotope ratios by mul… |
Deposits of the same type
- Vinto drinking water (DW1 to DW3) Bolivia
- Coal-mine tip, site 1 (unconfined chalk aquifer) France
- Coal-mine tip, site 2 (confined chalk aquifer) France
- Pebble deposit seeps United States
- Yarlung Tsangpo basin geothermal springs China
- Archibarca alluvial fan groundwater Argentina
- Rosario River fan hot springs Argentina
- Jiangling Basin thermal waters (JS-W1, YC-W1) China
Cite this page
IsoFind Atlas (2026). Ngawha geothermal field: wells, isotope signatures. https://www.isofind.tech/isotopes/en/sites/champ-geothermal-de-ngawha-puits/ (accessed 2026-10-20).
@misc{isofind2026ngawhageothermalfieldwellsiso,
title = {Ngawha geothermal field: wells, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/champ-geothermal-de-ngawha-puits/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20