 | Grimes, Stephen, Rickard, David, Hawkesworth, Chris, van Calsteren, Peter, Browne, Patrick (2000) The BroadlandsâOhaaki geothermal system, New Zealand Part 1. Strontium isotope distribution in well BrO-29. Chemical Geology, 163 (1) 247-265 doi:10.1016/s0009-2541(99)00128-x | Journal (article/letter/editorial) | | elsevier.comrlocaterchemgeo The BroadlandsâOhaaki geothermal system, New Zealand Part 1. Strontium isotope...UniĂersity of Auckland, PriĂate Bag 92019, Auckland, New Zealand b c Received 12 October 1998; accepted 12 May...Abstract Well BrO-29 at the BroadlandsâOhaaki geothermal system, New Zealand, penetrates a mixed volcanicrsedimentary...groundmass by a recharge fluid represented by modified Taupo rainwater. The greywackerargillite basement from...results from well BrO-29 at the BroadlandsâOhaaki geothermal system, New Zealand. This first paper outlines |  | | Journal (article/letter/editorial) | | Hydrothermal Minerals and Precious Metals in the Broadlands-Ohaaki Geothermal System: Implications for Understanding...Private Bag, 92019, Auckland, New Zealand Abstract The Broadlands-Ohaaki geothermal system is a boiling...environment. Quartz, illite, K feldspar (adularia), albite, chlorite, calcite, and pyrite are the main hydrothermal...chlorite, pyrite, and calcite varies here, but albite is absent. Geothermal production wells with high...examine the epithermal environment within the Broadlands-Ohaaki hydrothermal system from the surface to 750 |  | | Journal (article/letter/editorial) | | Tectonic Controls on Hydrothermal Flow, Taupo Volcanic Zone, New Zealand: Implications for the Formation of...Auckland, New Zealand 2 Hot Solutions Ltd, PO Box 32-125, Devonport, Auckland, New Zealand Abstract...scales for geothermal systems of the Taupo Volcanic Zone, New Zealand. Most geothermal systems occur within...in one extinct (Ohakuri) and six active (Broadlands-Ohaaki, Waiotapu, Rotokawa, Waimangu, Te Kopia, and...shearing, caused by low differential stresses. The Taupo Volcanic Zone is highly prospective for epithermal-style |  | | Journal (article/letter/editorial) | | geothermal fields from the central Taupo Volcanic Zone, New Zealand G. Bignall a,*, P.R.L. Browne a, P...University of Auckland, P.O. Box 92019, Auckland, New Zealand b New Mexico Institute of Technology, Socorro, NM...reservoir rocks are all andesites or elsewhere (New Zealand), entirely rhyolitic. Marker or key horizons...Orakeikorako Geothermal Field, Taupo Volcanic Zone (TVZ), New Zealand (Fig. 1). The three ignimbrites...of some active geothermal fields in the central Taupo Volcanic Zone; also shown are faults and other structural |  | | Journal (article/letter/editorial) | | OF VOLCANIC ROCKS: II. THE BROADLANDS-OHAAKI HYDROTHERMAL SYSTEM, NEW ZEALAND YONGHONG Y AN, 1 DAVID A...Auckland, New Zealand 3Geothermal Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand...in core samples from the Broadlands-Ohaaki hydrothermal system, New Zealand, were investigated using... INTRODUCTION The Broadlands-Ohaaki geothermal system, North Island, New Zealand, is a currently active...to characterize hydrothermal clays in the Broadlands-Ohaaki geothermal system to determine the characteristics |  | | Journal (article/letter/editorial) | | FOR OVERPRESSURING IN THE BROADLANDS-OHAAKI GEOTHERMAL SYSTEM, NEW ZEALAND STUART F. SIMMONS,â MARK P...92019, Auckland Mail Centre, Auckland 1142, New Zealand AND T. JAMES REYNOLDS FLUID INC., 1401 Wewatta...PH3, Denver, Colorado 80202 Abstract The Broadlands-Ohaaki geothermal system is host to an epithermal...core of a single quartz crystal from the Broadlands-Ohaaki geothermal system, which is host to a modern...modern system. Broadlands-Ohaaki is a high-temperature geothermal system located in the Taupo Volcanic Zone |  | Simmons, S. F., Arehart, G., Simpson, M. P., Mauk, J. L. (2000) Origin of Massive Calcite Veins in the Golden Cross Low-Sulfidation, EpithermalAu-Ag Deposit, New Zealand. Economic Geology, 95 (1) 99-112 doi:10.2113/gsecongeo.95.1.99 | Journal (article/letter/editorial) | | Cross Low-Sulfidation, Epithermal Au-Ag Deposit, New Zealand STUART F. SIMMONS,â Geothermal Institute and...University of Auckland, Private Bag, 92019, Auckland, New Zealand GREG AREHART,* Institute of Geological and Nuclear...Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand MARK P. SIMPSON, Geology Department, University...University of Auckland, Private Bag, 92019, Auckland, New Zealand AND JEFFREY L. MAUK Geology Department, University...University of Auckland, Private Bag, 92019, Auckland, New Zealand Abstract At Golden Cross, andesitic lavas and |  | | Journal (article/letter/editorial) | | Gold-Silver-Base Metal Sulfide-Quartz Vein System, New Zealand: Temperature and Salinity Controls on Electrum...Nuclear Sciences, P.O. Box 31312, Lower Hutt, New Zealand Abstract The large, andesite-hosted quartz vein...associated Hauraki goldfield in the North Island of New Zealand (Fig. 1). At Waihi, an extensive quartz vein...(1924). Recent exploration and mining have provided new data and sample material for geological and geochemical...Pacific-Australian plate boundary in northern New Zealand. The regional geology consists of a north-northwestâtrending |  | | Journal (article/letter/editorial) | | sources of lead in hydrothermal of the Taupo Volcanic Zone, New Zealand systems JEFFREYW. HEDENQUISTâand... 1992) Abstract-The Taupo Volcanic Zone is a complex volcanic-tectonic region over 250 km long, corresponding...corresponding to the volcanic arc of the Taupo-Hikurangi subduction system. Volcanism is dominantly rhyolitic...from all volcanic and basement rock types of the region were also analyzed and show a range of values by...they may be distinguished. Sulfides from the Broadlands and Waiotapu geothermal systems are homogeneous |  | | Journal (article/letter/editorial) | | SPHALERITE TRAPPING COMMUNICATIONS FROM THE BROADLANDS-OHAAKI OF FLUIDS BEING BOILED TOWARD STUART F. SIMMONS... fluid inclusionstudyof sphalerites from the Broadlands- Thereare several occurrences of sphalerite,...chalcopyrite typically occur together with it. Broadlands-Ohaaki GeothermalSystem Rarecobaltite, arsenopyrite...somesphalerite crystals (Browne,1969). TheBroadlands-Ohaaki geothermal system isoneof about inclusions is uncommon...drilling libriumwith sphalerite denserocks,suchasthe Broadlands Dain thissystem(1964-1984)totaled52 wells,rangingfrom |  | | Journal (article/letter/editorial) | | Favona Epithermal Gold-Silver Deposit, Waihi, New Zealand MARK P. SIMPSONâ AND JEFFREY L. MAUK School of...Mail Centre, Auckland 1142, New Zealand Abstract The Favona deposit is a new epithermal vein discovery...million oz (Moz) Ag), in the Hauraki goldfield of New Zealand. The concealed Favona vein is hosted in late...with hydrothermal albite adjacent to the Amaranth vein at depth. Both adularia and albite are variably replaced...Alteration is broadly similar at each deposit, although albite and calcite are more abundant at Martha. Fluid |  | | Journal (article/letter/editorial) | | evolution of the Waiotapu geothermal system, New Zealand, based on the chemical and isotopic composition...Division, DSIR, Wairakei, Private Bag, Taupe, New Zealand *Geothermal Institute and Geology Department...University of Auckland, Private Bag, Auckland, New Zealand (Received February 16, 1989; accepted in revised...is hosted by silicic rocks of the Taupo Volcanic Zone, New Zealand. Exploration drilling in the late...reveals an alteration assemblage of quartz and albite + adularia, with a variable distribution of chlorite |  | | Journal (article/letter/editorial) | | Auckland, Auckland Mail Centre, Auckland 1142, New Zealand Abstract Volcanic rocks hosting quartz ± calcite...to altered rock, forming calcite and chlorite; albite is conserved or forms in association with weak...propylitic alteration includes quartz, adularia, albite, illite, chlorite, calcite, pyrite, and epidote...in Figure 2. Rocks containing only plagioclase (albite-anorthite end members and solid solutions) will...contain. In Figure 2, data from volcanic rocks of the Taupo volcanic zone (Graham et al., 1995) are shown to |  | | Journal (article/letter/editorial) | | At distances >50 m from the vein, the assemblage albite + Fe-chlorite + illite + pyrite ( montmorillonite...University of Auckland, Private Bag 92019, Auckland, New Zealand phases in veins. Kaolinite  halloysite  jarosite...drill core were obtained. Sardinia Gold Mining, a new joint venture between Progemisa, General Gold Resources...is a subaerial, silica sinter deposit. Feldspars Albite replaces Ca-plagioclase and sanidine phenocrysts...compositions range from Ab87 to Ab90. In contrast, albite completely replaces K-feldspar phenocrysts. K-feldspar |  | | Journal (article/letter/editorial) | | shallow portion of the Waiotapu geothermal system, New Zealand JEFFREY W. HEDENQUIST Department of Mineral...20 major geothermal systems in the Taupo Volcanic Zone, New Zealand. Two extinct dacite cones and a rhyolite...features in the Waiotapu geothermal system, New Zealand, and compares the discharging waters to those...hydrothermal occurrences in the Taupe Volcanic Zone of New Zealand (Fig. 1) Its characteristics are similar overall...directly related to volcanic discharges (e.g., Broadlands and Wairakei; HEDENQUIST,1986). This is due to |  | | Journal (article/letter/editorial) | | at the Golden Cross Epithermal Au-Ag Deposit, New Zealand JEFFREY L. MAUKâ AND MARK P. SIMPSON School of...92019, Auckland Mail Centre, Auckland 1142, New Zealand Abstract Golden Cross is a late Miocene volcanic-hosted...assemblages located in the Coromandel peninsula, New Zealand. Gold- and Ag-bearing quartz veins occur in intensely...Leavitt and Arehart, 2005; Warren et al., 2007). District- and deposit-scale investigations of oxygen and...Coromandel peninsula within the North Island of New Zealand. 0361-0128/98/000/000-00 $6.00 subduction along |  | | Journal (article/letter/editorial) | | Polytypesof illite from the Broadlands-Ohaakigeothermalsystemin New Zealand have been studied with transmission...the duration of hydrothermal activity in the Broadlands-Ohaakisystem. INrnooucrroN Experimental, field...illite from the BroadlandsOhaaki geothermalsystem,New Zealand. This system is well suited for such an investigation...Moreover, the alteration mineral assemblageof the Broadlands-Ohaakisystem is well characterized(Browne and...Lattice-fringe imagesof phyllosilicatesin the Broadlands-Ohaakispecimens were obtained using (00/) reflections |  | | Journal (article/letter/editorial) | | redistribution of Li, B and Cl in the Taupo Volcanic Zone, New Zealand A.G. Reyes a,â, W.J. Trompetter b...Hutt, New Zealand GNS-Science, National Isotope Centre, 30 GraceïŹeld Road, Lower Hutt, New Zealand a r...Hydrothermal waterârock interaction Taupo Volcanic Zone New Zealand a b s t r a c t Lithium, B and Cl...underlying high temperature hydrothermal systems in the Taupo Volcanic Zone (TVZ). The ïŹuid mobility of Li decreases...been evaluated using B/Li and B/Cl ratios. In the Taupo Volcanic Zone (TVZ), Cl ïŹuxes are used to estimate |  | Chambefort, I., Lewis, B., Simpson, M. P., Bignall, G., Rae, A. J., Ganefianto, N. (2017) Ngatamariki Geothermal System: Magmatic to Epithermal Transition in the Taupo Volcanic Zone, New Zealand. Economic Geology, 112 (2) 319-346 doi:10.2113/econgeo.112.2.319 | Journal (article/letter/editorial) | | Magmatic to Epithermal Transition in the Taupo Volcanic Zone, New Zealand I. Chambefort,1,â B. Lewis,1 M. P...2000, Taupo 3352, New Zealand 2 Mighty River Power Limited, PO Box 245, Rotorua 3040, New Zealand Abstract...(>225°C) geothermal systems in the Taupo Volcanic Zone, North Island, New Zealand. At shallow levels (<2 km)...hydrothermal alteration found nowhere else in the Taupo Volcanic Zone. Two separate phases of hydrothermal...epidote ± wairakite ± actinolite (along with ± albite and ± illite) is widespread, and could equally |  | | Journal (article/letter/editorial) | | P.O. Box 30-125, St Martins, Christchurch, New Zealand Abstract Palinpinon geothermal field, Negros...Wairakei Research Centre, Private Bag 2000, Taupo, 3352, New Zealand. 0361-0128/11/3997/1425-22 alkaline...geothermal fluids at the Lihir gold mine in Papua New Guinea contain 13 to 16 ppb gold, and given the current..., 2011a, b) and suggest that magmatism in this region has been influenced by melting of subducted oceanic...sequence that is traceable throughout the Visayas region of the Philippines and is related to subduction |  | | Journal (article/letter/editorial) | | Prospects of the Waitekauri Area, Hauraki Goldfield, New Zealand MARK P. SIMPSONâ AND JEFFREY L. MAUK School of...Auckland, New Zealand Abstract The Waitekauri area of the Hauraki goldfield, New Zealand, contains several... Alteration minerals include quartz, adularia, albite, chlorite, pyrite, illite, interstratified illite-smectite...shallow levels at both Scotia and Jasper Creek. Albite occurs in a discrete zone below adularia at Scotia...et al., 2003; Comstock: Hudson, 2003; Favona, New Zealand: Simpson and Mauk, 2007). Many papers describe |  | Simpson, Mark P., Gazley, Michael F., Stuart, Alistair G.J., Pearce, Mark A., Birchall, Renee, Chappell, Debra, Christie, Anthony B., Stevens, Murray R. (2019) Hydrothermal Alteration at the Karangahake Epithermal Au-Ag Deposit, Hauraki Goldfield, New Zealand. Economic Geology, 114 (2) 243-273 doi:10.5382/econgeo.2019.4630 | Journal (article/letter/editorial) | | Epithermal Au-Ag Deposit, Hauraki Goldfield, New Zealand Mark P. Simpson,1,â Michael F. Gazley,2,* Alistair...Research Centre, 114 Karetoto Road-RD4, Taupo 3377, New Zealand Scientific and Industrial Research Organisation...2013, New Zealand 4 GNS 5 Stevens Science, 1 Fairway Drive, Avalon, Lower Hutt 5010, New Zealand and...Pine Harbour Parade, Beachlands, Auckland 2018, New Zealand Abstract The Karangahake deposit is the third...producer in the Hauraki goldfield, Coromandel, New Zealand. Production was mainly from the Maria and Welcome/Crown |  | Christie, A. B., Simpson, M. P., Brathwaite, R. L., Mauk, J. L., Simmons, S. F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102 (5) 785-816 doi:10.2113/gsecongeo.102.5.785 | Journal (article/letter/editorial) | | Zone, New Zealand ANTHONY B. CHRISTIE,â GNS Science, P.O. Box 30-368, Lower Hutt 5040, New Zealand MARK...1142, New Zealand ROBERT L. BRATHWAITE, GNS Science, P.O. Box 30-368, Lower Hutt, New Zealand JEFFREY...92019, Auckland Mail Centre, Auckland 1142, New Zealand Abstract Epithermal Au-Ag vein deposits of the...Hauraki goldfield in the Coromandel volcanic zone, New Zealand, produced 320,000 kg Au and 1.5 million kg Ag...volcanic zone (Skinner, 1986), North Island, New Zealand, contains about 50 epithermal Au-Ag deposits |  | | Journal (article/letter/editorial) | | Deposits of the Southern Hauraki Goldfield, New Zealand* Mark P. Simpson,1,** Sabina Strmic Palinkas...University of Auckland, Private Bag 92019, Auckland, New Zealand 2 U.S. Geological Survey, P.O. Box 25046, MS-973...ÂWaitekauri deposits, southern Hauraki goldfield, New Zealand. Quartz veins contain colloform to crustiform...Coromandel Peninsula of the North Island of New Zealand (Fig. 1). It contains *A digital supplement to...Research Centre, 114 Karetoto Road-RD4, Taupo 3377, New Zealand. â Corresponding author, e-mail: s.str |  | de Ronde, C. E. J., Faure, K., Bray, C. J., Whitford, D. J. (2000) Round Hill Shear Zone-Hosted Gold Deposit, Macraes Flat, Otago,New Zealand: Evidence of a Magmatic Ore Fluid. Economic Geology, 95 (5) 1025-1048 doi:10.2113/gsecongeo.95.5.1025 | Journal (article/letter/editorial) | | Zone-Hosted Gold Deposit, Macraes Flat, Otago, New Zealand: Evidence of a Magmatic Ore Fluid CORNEL E. J...Nuclear Sciences, P.O. Box 31-312, Lower Hutt, New Zealand KEVIN FAURE,* Department of Geochemistry, Geological...near, the HydeMacraes shear zone, Macraes Flat, New Zealand. Field relationships show stockwork veins are...deposits occur throughout the Otago region of the South Island, New Zealand, all of which are hosted by the...Nuclear Sciences, P.O. Box 31-312, Lower Hutt, New Zealand. 0361-0128/00/3074/1025-24 $6.00 gold deposits |
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