1-20 OF 60 RESULTS FOR

Lake Rotokawa

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Journal: Economic Geology
Published: 01 August 1987
Economic Geology (1987) 82 (5): 1109–1129.
... different hydrothermal explosition breccias are preserved in surface outcrops, the largest eruptive site being a crater of 1.5 km in diameter which formed about 6,060 years ago and is presently occupied by an acid lake (Lake Rotokawa) with a pH approximately 2. Significant bedded sulfur deposits which...
Image
TABLE 1 —Water compositions for WT1050, <b>Lake</b> Ngakoro, and <b>Lake</b> <b>Rotokawa</b>. Sa...
in > PALAIOS
Published: 01 October 2000
TABLE 1 —Water compositions for WT1050, Lake Ngakoro, and Lake Rotokawa. Sample GS-1-99 is from vent at WT1050; GS 2-99 was collected 5.5 m from vent while the geyser was dormant; GS-3-99 was collected 12 m from vent during a stream surge due to eruption of geyser. Sample NF-1-99 collected 30 m
Image
FIGURE 2 —Thin-section photomicrographs of stromatolites from <b>Lake</b> <b>Rotokawa</b>...
in > PALAIOS
Published: 01 October 2000
FIGURE 2 —Thin-section photomicrographs of stromatolites from Lake Rotokawa that display features typical of stromatolites found in acid-spring systems. (A) Vertical section through spicular stromatolites. Arrow indicates landward direction. (B) Vertical section through bulbous stromatolite. (C
Image
FIGURE 14 —Stromatolites at <b>Lake</b> <b>Rotokawa</b>. (A) General view of northwest po...
in > PALAIOS
Published: 01 October 2000
FIGURE 14 —Stromatolites at Lake Rotokawa. (A) General view of northwest portion of Sinter Flats. Stromatolites grow along margin of lake below white arrow. Photograph taken in February 1999. (B) Sinter Flats on west and southwest margins of Hot Pools Lake taken in July 1998 when littoral flats
Image
FIGURE 15 —Laminae and minerals in stromatolites at <b>Lake</b> <b>Rotokawa</b>. (A) Oute...
in > PALAIOS
Published: 01 October 2000
FIGURE 15 —Laminae and minerals in stromatolites at Lake Rotokawa. (A) Outer diatomaceous laminae (D) of stromatolite overlying a structureless opal-A laminae that contains scattered pollen grains (arrows). (B) Siliceous laminae separated by thin laminae formed of pollen grains (arrows
Image
FIGURE 16 —Fungi in stromatolites from <b>Lake</b> <b>Rotokawa</b>. (A) Network of collap...
in > PALAIOS
Published: 01 October 2000
FIGURE 16 —Fungi in stromatolites from Lake Rotokawa. (A) Network of collapsed fungal hyphae on stromatolite surface. (B) Close up of collapsed fungal hyphae in A. (C) Terminal spore on fungal hyphae (arrow). Detailed views of hyphae shown by arrow in A. (D) Spore-like body attached to collapsed
Image
FIGURE 17 —Biota in <b>Lake</b> <b>Rotokawa</b> stromatolites. (A) Silicified bacteria (a...
in > PALAIOS
Published: 01 October 2000
FIGURE 17 —Biota in Lake Rotokawa stromatolites. (A) Silicified bacteria (arrows) on stromatolite surface. (B) Silicified bacteria and small filamentous microbes (arrow). (C) Cross-sections through bacteria. Note possible silicified cytoplasm? (arrows) inside some cells. Silicified bacteria held
Journal Article
Journal: PALAIOS
Published: 01 October 2000
PALAIOS (2000) 15 (5): 450–475.
...TABLE 1 —Water compositions for WT1050, Lake Ngakoro, and Lake Rotokawa. Sample GS-1-99 is from vent at WT1050; GS 2-99 was collected 5.5 m from vent while the geyser was dormant; GS-3-99 was collected 12 m from vent during a stream surge due to eruption of geyser. Sample NF-1-99 collected 30 m...
FIGURES | View All (18)
Journal Article
Journal: Economic Geology
Published: 01 May 2016
Economic Geology (2016) 111 (3): 589–618.
... from 0.1 to >1,000 μ g/kg with a large degree of intersystem variability. Some of the largest contrasts in Au, Ag, Pb, and Te concentrations are observed in the two nearest systems, Rotokawa and Wairakei, which are only 10 km apart. The correlations between metals are poor, except for Ag-Au-Pb-Te...
FIGURES | View All (21)
Image
Map of southern part of the <b>Rotokawa</b> geothermal system showing resistivity ...
Published: 01 May 2012
on Lake Rotokawa (white polygon). Ejecta isopachs (m) and ejecta limit (dashed black line) are shown for largest hydrothermal eruption described at this site ( Collar and Browne, 1985 ).The Waikato River is shown by a thick white line; Parariki stream draining Lake Rotokawa shown by thin white line; roads
Series: Special Publications of the Society of Economic Geologists, Special Publications of the Society of Economic Geologists
Published: 01 January 2005
DOI: 10.5382/SP.10.07
EISBN: 9781629490342
... zones in the well, one of which is vigorously boiling and supplying excess vapor to the well. F ig . 3. Comparison of total discharge Hg compositions for fluids from Ohaaki, Kawerau, Ruapehu Crater Lake, and White Island. Data from various surface discharges at Rotokawa are also listed...
FIGURES | View All (18)
Journal Article
Journal: Clay Minerals
Published: 01 June 2002
Clay Minerals (2002) 37 (2): 299–322.
... is Lake Rotokawa itself (0.6 km 2 , pH 2.3) It is fed by ascending gases, steam and surrounding acid-sulphate springs. North of the lake are areas of steaming warm ground, steam vents, fumaroles, occasional mud pots and dissolution pits. Much of the area around Lake Rotokawa is covered by Holocene...
FIGURES | View All (11)
Journal Article
Journal: Economic Geology
Published: 01 May 2012
Economic Geology (2012) 107 (3): 427–457.
... on Lake Rotokawa (white polygon). Ejecta isopachs (m) and ejecta limit (dashed black line) are shown for largest hydrothermal eruption described at this site ( Collar and Browne, 1985 ).The Waikato River is shown by a thick white line; Parariki stream draining Lake Rotokawa shown by thin white line; roads...
FIGURES | View All (14)
Journal Article
Published: 26 November 2003
Canadian Journal of Earth Sciences (2003) 40 (11): 1643–1667.
... is located immediately north of Lake Rotokawa with the largest being an accumulation of hot springs (up to 90 °C) of ∼ 0.07 km 2 in area forming a small thermal lake. This lake is surrounded by a sinter flat formed of finely laminated silica interbedded with unconsolidated mud deposits. The majority...
FIGURES | View All (12)
Journal Article
Published: 27 February 2015
Geochemistry: Exploration, Environment, Analysis (2015) 15 (2-3): 193–204.
... hydrothermal systems represented by areas of hydrothermal alteration. The Rotokawa and Waiotapu hydrothermal centres have been identified as particularly prospective, suggesting these systems may represent modern analogues of epithermal gold mineralization. This study applies the weights of evidence spatial...
FIGURES | View All (8)
Image
(a) Intraclasts of thinly-layered, silica-cemented, silica-rich <b>lake</b> sedime...
Published: 01 June 2002
F ig . 2. (a) Intraclasts of thinly-layered, silica-cemented, silica-rich lake sediments within more recent silica residue-cemented opaline sediments, presently undergoing desiccation, Lake Rotokawa. Diameter of coin is 26 mm. (b) Stalactitic, scalloped flounces of silica residue draped across
Journal Article
Published: 16 October 2012
Canadian Journal of Earth Sciences (2012) 49 (10): 1217–1250.
... changes that reflect downslope changes in water chemistry and temperature. The facies architecture, however, becomes exponentially more intricate when more factors start to impact the system. This phenomenon is readily apparent in the geothermal area around Lake Roto-a-Tamaheke (located...
FIGURES | View All (21)
Journal Article
Journal: GSA Bulletin
Published: 22 January 2020
GSA Bulletin (2020) 132 (9-10): 1914–1930.
... the locus, dynamics, and possible triggers of these events. We investigated a complex field of >30 craters formed over three separate episodes of steam-driven eruptions at Lake Okaro within the Taupo volcanic zone, New Zealand. Fresh unaltered rock excavated from initially >70 m depths in the base...
FIGURES | View All (12)
Journal Article
Journal: Geosphere
Published: 19 October 2017
Geosphere (2017) 13 (6): 1993–2016.
... 22.9 Ma Lake City caldera fossil hydrothermal system. The caldera margin consists of relatively straight segments linked by more structurally complex intersections; these structural intricacies produce a zone of deformation that can reach >300 m wide. Structural analyses show that the wide (up...
FIGURES | View All (10)
Series: Reviews in Economic Geology, Reviews in Economic Geology
Published: 01 January 2016
DOI: 10.5382/Rev.18.10
EISBN: 9781629490922
...- and silverbearing tellurides deposit as scales in two-phase pipelines in the Rotokawa geothermal system, New Zealand ( Reyes et al., 2002 ). Low-intermediate sulfidation state epithermal ores in some calc-alkaline volcanic rocks contain tellurium minerals ( Cook and Ciobanu, 2005 ). For example, a diversity...
FIGURES | View All (14)