The Ngatamariki Geothermal Field, NZ: Surface Manifestations Past and Present

Abstract

The geothermal field, located 7 south of Orakeikorako, discharges dilute chloridewaters of almost from springs mostly on the of the field. the northwestern field are silicified, probably due to their having reacted with heated groundwaters. Sinter are Ngatamariki but are mostly relict from former activity. In 1994, the heat loss from the field was There has been a of thermal activity southward over the past 60 years; the changes were recognised comparing air photographs taken in and In 1948, a hydrothermal eruption deposited breccia around its crater, which is now occupied by a pool at Another pool at first noticed in 1993, deposits a mixture of silica calcite.