写真

Photographer's Note

Wai-O-Tapu (Māori for 鉄acred Waters) is an active geothermal area just north of the Reporoa caldera in New Zealand's Taupo Volcanic Zone. The area has many hot springs noted for their colourful appearance, in addition to the Lady Knox Geyser. Prior to European occupation the area was the homeland of the Ngati Whaoa tribe who descended from those on the Arawa waka (canoe).(Wikipedia)
Wai-O-Tapu is a marvel of Nature. Raw power, raw smells, raw scars over the land. Humans, or at least the Anglo- Saxons have come up with romantic names for some of the features- names like Artist痴 Palette, Champagne Pool, Oyster Pool, Primrose Terrace
What you see is the oft-photographed Champagne Pool about which Wikipedia says the following:

Champagne Pool is a prominent geothermal feature within the Waiotapu geothermal area in the Waikato region of the North Island of New Zealand. The terrestrial hot spring is located about 30 km southeast of Rotorua and about 50 km northeast of Taupo. The name Champagne Pool is derived from the abundant efflux of carbon dioxide (CO2) similar to gas bubbles in a glass of bubbling Champagne. The hot spring was formed 900 years ago by a hydrothermal eruption , which makes it in geological terms a relatively young system. Its crater is around 65 m in diameter with a maximum depth of approximately 62 m and is filled with an estimated volume of 50,000 m3 of geothermal fluid .
Hydrochemistry
The deep geothermal water below Champagne Pool is of the order of 260ーC [3] but water temperature within the pool is maintained at 73ーC to 75ーC by losing heat to the atmosphere. The pH of 5.5 is relatively constant due to buffering by the flux of CO2. Gases are mainly CO2, but to less extent nitrogen (N2), methane (CH4), hydrogen (H2), hydrogen sulfide (H2S) and traces of oxygen (O2) [4]. The siliceous geothermal fluid is oversaturated with metalloid compounds such as orpiment (As2S3) and stibnite (Sb2S3) which precipitate and form orange subaqueous deposits [5]. The colorful deposits are in sharp contrast to the grey-white silica sinter surrounding Champagne Pool.

Photo Information
  • Copyright: Klaudio Branko Dadich (daddo) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3572 W: 114 N: 6364] (28748)
  • Genre: 場所
  • Medium: カラー
  • Date Taken: 2007-04-10
  • Categories: 自然
  • Exposure: f/11, 1/160 seconds
  • More Photo Info: view
  • Photo Version: Original Version
  • Date Submitted: 2008-10-31 15:04
Viewed: 3613
Points: 42
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Additional Photos by Klaudio Branko Dadich (daddo) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3572 W: 114 N: 6364] (28748)
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