Alteration Mineralogy of Sediments in the Huka Falls Formation of Thete Mihi Area, Wairakei
- Location
- Wairakei, New Zealand; Taupo Volcanic Zone
- Conference
- New Zealand Geothermal Workshop
- Year
- 1991
- Session
- Geology
- Language
- English
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Abstract
The Huka Falls Formation in the Te Mihi area of the geothermal system comprises hydrothermal eruption brecciasand sediments up to thick. Sixty core samples recovered from drillholes and 222 contain hydrothermal minerals grouped into3 zones;smectite, adularia-calcite-chlorite and that reflect the prevailing thermal regime. Smectites occur in the sediments where measured well temperatures are below and adularia-calcite-chlorite between 220?C.End member illite occurs where temperaturesexceed with interlayered illite-smectitehaving increasing proportions of illite at higher temperatures.
Copyright 1991, University of Auckland. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.