Geophysical investigations of the Wairakei Field

Hunt, Trevor M.; Bromley, Chris; Risk, G. F.; Sherburn, S.; Soengkono, S.

doi:10.1016/j.geothermics.2008.11.002

Cited by 33 publications

(16 citation statements)

References 25 publications

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“…Grindley 1960Grindley , 1965Healy et al 1964;Hochstein & Hunt 1980;Hunt et al 2009) identified Wairakei-Tauhara as situated over a broad basement depression infilled by ≥ 3 km of low-density volcanic and sedimentary deposits (Hunt et al 2009;Rosenberg et al 2009a). The deep structure of Wairakei-Tauhara includes a central Wairakei Block horst (Grindley 1961 Grindley 1961Grindley , 1965Downs et al 2014).…”

Section: Structure and Faultsmentioning

confidence: 99%

Volcanic and sedimentary facies of the Huka Group arc-basin sequence, Wairakei–Tauhara Geothermal Field, New Zealand

Cattell

Cole

Oze

2016

New Zealand Journal of Geology and Geophysics

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Section: Structure and Faultsmentioning

confidence: 99%

Volcanic and sedimentary facies of the Huka Group arc-basin sequence, Wairakei–Tauhara Geothermal Field, New Zealand

Cattell

Cole

Oze

2016

New Zealand Journal of Geology and Geophysics

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“…1). The natural heat and mass discharge from Wairakei has been assessed by several authors with average values around 400 kg/s and 400 MWt (Fisher, 1964;Allis, 1981;Hunt et al, 2009).…”

Section: Pre-development State Of the Reservoirmentioning

confidence: 99%

Evolution of the Wairakei geothermal reservoir during 50 years of production

Bixley¹,

Clotworthy²,

Mannington

2009

Geothermics

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“…The silica sinter forms several centimeters thick crusts at the bottom and walls of the pool and around the inlet pipe (Figure 2a). Within the channel, tens of [36]). (c) Geological interpretation of structural elements at the Wairakei geothermal field based on well stratigraphy and seismic reflection data (modified from Rosenberg et al [34]).…”

Section: Silica Depositsmentioning

confidence: 99%

Textural Characteristics of Noncrystalline Silica in Sinters and Quartz Veins: Implications for the Formation of Bonanza Veins in Low-Sulfidation Epithermal Deposits

Taksavasu

Monecke

Reynolds³

2018

Minerals

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Abstract:Silica sinters forming at the Wairakei geothermal power plant in New Zealand are composed of noncrystalline opal-A that deposited rapidly from cooling geothermal liquids flashed to atmosphere. The sinter is laminated with alternating layers of variably compacted silicified filamentous microbes encased by chains of fused silica microspheres. Microscopic inspection of bonanza quartz vein samples from the Buckskin National low-sulfidation epithermal precious metal deposit in Nevada showed that colloform bands in these veins exhibit relic microsphere textures similar to those observed in the silica sinters from the Wairakei power plant. The textural similarity suggests that the colloform bands were originally composed of noncrystalline opal-A that subsequently recrystallized to quartz. The colloform bands contain dendrites of electrum and naumannite that must have grown in a yielding matrix of silica microspheres deposited at the same time as the ore minerals, implying that the noncrystalline silica exhibited a gel-like behavior. Quartz bands having other textural characteristics in the crustiform veins lack ore minerals. This suggests that ore deposition and the formation of the colloform bands originally composed of compacted microspheres of noncrystalline silica are genetically linked and that ore deposition within the bonanza veins was only episodic. Supersaturation of silica and precious metals leading to the formation of the colloform bands may have occurred in response to transient flashing of the hydrothermal liquids. Flashing of geothermal liquids may thus represent a key mechanism in the formation of bonanza precious metal grades in low-sulfidation epithermal deposits.

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Geophysical investigations of the Wairakei Field

Cited by 33 publications

References 25 publications

Volcanic and sedimentary facies of the Huka Group arc-basin sequence, Wairakei–Tauhara Geothermal Field, New Zealand

Volcanic and sedimentary facies of the Huka Group arc-basin sequence, Wairakei–Tauhara Geothermal Field, New Zealand

Evolution of the Wairakei geothermal reservoir during 50 years of production

Textural Characteristics of Noncrystalline Silica in Sinters and Quartz Veins: Implications for the Formation of Bonanza Veins in Low-Sulfidation Epithermal Deposits

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