| Title | Geochemistry of Ground and Thermal Waters in the Ngawha Area and Elsewhere, Northland, New Zealand |
|---|---|
| Authors | Cox, M.E. and P.R.L. Browne |
| Year | 1991 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | Most groundwaters in Northland are of ambient temperature neutral to alkaline and of type. Their chemistry is apparently determined by the lithologies through which they move, in particular the Permian-Jurassic basement which contributes B, and Li. There are also waters high in Ca-Mg hosted by the overlying sedimentaryrocks. Several waters may contain a component of connate water and a few near the coasts probably obtain some of their from seawater. The geothermal system at Ngawha itself contains alkali chloride water which is slightly acid. The system has a high gas content, largely which migrates at least 15 km. Both the gas and heat disseminated fiom the geothermal system influencegroundwater chemistry in theperipheral areas. |