Crater Lake, Mt Ruapehu, Tongariro National Park, Ruapehu District, Manawatu-Wanganui Region, New Zealandi
|Regional Level Types|
|Tongariro National Park||National Park|
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Latitude & Longitude (WGS84):
39° 16' 51'' South , 175° 33' 51'' East
Latitude & Longitude (decimal):
Köppen climate type:
Further geologic information is reported under Mount Ruapehu.
The Whakapapa Formation, consists of young post glacial lava flows, autoclastic breccia, and pyroclastics which erupted from at least six vents. Rocks from five vents have been given a member status (Hackett, 1985).
The Iwikau Member consists of thin lava flows, autoclastic breccia, and pyroclastics, dipping radially from the summit plateau, variably welded, some pumiceous to moderately vesicular dacites, and airfall ejecta. Lava flows have extended up to 8.5 kilometres from the vent, situated on the north-west slope of the volcano.
The Rangataua Member consists of lava flows, and pyroclastics. The lava consists of andesite with dark grey and black matrices. This is overlain with pyroclastics of shower bedded lapilli tuffs containing red scoria bombs.
The Toma Member consists of lava flows and minor pyroclastics, consisting of dark grey andesite, with minor shower bedded lapilli tuff.
The Pinnacle Ridge Member consists of welded breccias and tuff, with a steep primary dip, moderately vesicular to pumiceous.
The Crater Lake Member in the vicinity of Crater Lake of a complex origin, modified by glacial and volcanic explosive episodes. Pyramid Peak is mentioned in the source as a tephra mound of thin lava flows with tuff breccia, oxidised scoria bomb layers to 0.5 metres, welded breccia and tuffs, and shower bedded units. These deposits form a mantle over the rim of the tephra cone. Most of the lake area shows coarse airfall and basaltitic ejecta, and minor thin lava flows. Some black glassy bombs have been exploded, traveling up to 3 kilometres from the vent.
Regions containing this locality
|Australian Plate (Australia Plate)||Tectonic Plate|
|North Island, New Zealand||Island|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Detailed Mineral List:
| ⓘ Carnallite|
Formula: KMgCl3 · 6H2O
Reference: Railton, G.L¹., Watters, W.A. (1990) Minerals of New Zealand. New Zealand Geological Survey Bulletin 104, 89 pages. (¹published as G.L. Railton but his initials should be G.T. not G.L. - Errata sheet inserted in publication).
List of minerals arranged by Strunz 10th Edition classification
|Group 3 - Halides|
|ⓘ||Carnallite||3.BA.10||KMgCl3 · 6H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 11 - HALIDE COMPLEXES|
|ⓘ||Carnallite||184.108.40.206||KMgCl3 · 6H2O|
List of minerals for each chemical element
|H||ⓘ Carnallite||KMgCl3 · 6H2O|
|O||ⓘ Carnallite||KMgCl3 · 6H2O|
|Mg||ⓘ Carnallite||KMgCl3 · 6H2O|
|Cl||ⓘ Carnallite||KMgCl3 · 6H2O|
|K||ⓘ Carnallite||KMgCl3 · 6H2O|
Sort byYear (asc) Year (desc) Author (A-Z) Author (Z-A)
Hackett, W.R. (1985) Geology and Petrology of Ruapehu Volcano and related vents. Unpublished Ph.D. Thesis, Victoria University of Wellington, New Zealand.
Railton, G.L¹., Watters, W.A. (1990) Minerals of New Zealand. New Zealand Geological Survey Bulletin 104, 89 pages. (¹published as G.L. Railton but his initials should be G.T. not G.L. - Errata sheet inserted in publication).
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