...K. A. Rodgers; K. A. Hamlin; P. R. L. Browne; K. A. Campbell; R. Martin Abstract Ruatapu cave has developed beneath a block of hydrothermally altered Quaternary vitric tuff in the active Orakei Korako geothermal field. The cave extends ~45 m, with a vertical drop of 23 m, to a shallow pool of clear...

... outflow channels and pools, which record distinctive macrotextures and microtextures along a thermal gradient. Sinters from four geothermal fields, Orakei Korako, northern Waiotapu, Te Kopia, and Umukuri, within the Taupo Volcanic Zone, New Zealand, were sampled from two common microbe-rich microfacies...

...Figure 2 Field occurrences, outcrop characteristics, and macroscale examples of low-temperature palisade sinters described in this study. A) Distal sinter-apron (Rainbow Terrace) of actively forming sinter at Orakei Korako; white areas represent dry sinter and brown areas indicate probable...

..., and in association with geologic, geophysical, and geochemical surveys, wells were drilled at Waiotapu, Reporoa, Broadlands, Tauhara, Orakei Korako, and Te Kopia in the central volcanic region of the North Island, and at Ngawha in Northland. At Broadlands the production potential of wells already drilled is about...

... or destroying biosignals. We monitored alteration and diagenesis of newly precipitated, filamentous microbe-rich sinter during a two-year field experiment, where sinter was suspended inside a fumarole at Orakei Korako, Taupo volcanic zone, New Zealand. Patchy and complex diagenesis resulted from changes...

... of sheath replacement by silica can always be found (Fig.  10F ). Although TEM only allows examination of a very small amount of sample material, no areas were found where the two morphotypes coexisted. The Orakei Korako geothermal field is located 25 km northwest of Wairakei (Fig.  1 ). Active...

...F ig . 1. Sketch map, showing the locations of Wairakei and Orakei Korako geothermal fields within the Taupo Volcanic Zone. Insert: North Island, New Zealand. ...

...Figure 8. Cross sections of the modern distribution of Paeroa Subgroup ignimbrites (see Fig. 7A ): (A) northwest-southeast, through the Te Weta and southern Paeroa fault blocks at the Te Kopia geothermal field, (B) from the Orakei Korako to Ngatamariki geothermal fields, and (C) west-east...

...Kathleen A. Campbell; K. Sannazzaro; K.A. Rodgers; N.R. Herdianita; P.R.L. Browne Abstract The Umukuri silica sinter is a large, late Pleistocene hot-spring deposit exposed along the eastern upthrown block of the Umukuri Fault, one kilometer southwest of the active Orakei Korako geothermal area...

... ) among some silica sinters . Mineralogical Magazine , 65 , 157 – 167 . Rodgers , K.A. , Hamlin , K.A. , Browne , P.R.L. , Campbell , K.A. and Martin , R. ( 2000 ) The steam condensate alteration mineralogy of Ruatapu cave, Orakei Korako geothermal field, Taupo Volcanic...

... fabric in cross-section, within a primary porosity ‘window’, SC 30, La Marciana. (m) Poorly preserved, silicified plant reeds, plan view, Golden Fleece Terrace (dry), Orakei Korako, TVZ. (n) Possible silicified and recrystallized plant stems, bedding plane view, SC 9, La Marciana. (o) Desiccation cracks...

... together with the Te Kopia and the Orakei Korako geothermal fields are located on the Paeroa fault (see Fig. 1 ). Given the size of the fault (∼28 km long and maximum throw of ∼1100 m), it probably extends to the base of the continental crust (e.g., at 15–20 km depth; Stern et al., 2010 ) and intersects...