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File:Upper Terraces of Mammoth Hot Springs.jpg

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English: Hot water is the creative force of the terraces. Even though Mammoth Hot Springs lie north of the caldera ring-fracture system, a fault trending north from Norris Geyser Basin, 21 miles (34 km) away, may connect Mammoth Hot Springs to the hot water of that system. A system of small fissures carries water upward to create approximately 50 hot springs in the Mammoth Hot Springs area. Another necessary ingredient for terrace growth is the mineral calcium carbonate. Thick layers of sedimentary limestone, deposited millions of years ago by vast seas, lie beneath the Mammoth area. As ground water seeps slowly downward and laterally, it comes in contact with hot gases charged with carbon dioxide rising from the magma chamber. Some carbon dioxide is readily dissolved in the hot water to form a weak carbonic acid solution. This hot, acidic solution dissolves great quantities of limestone as it works up through the rock layers to the surface hot springs. Once exposed to the open air, some of the carbon dioxide escapes from solution. As this happens, limestone can no longer remain in solution. A solid mineral reforms and is deposited as the travertine that forms the terraces. (The image caption was taken from here.)
Français : Hautes terrasses de Mammoth Hot Springs (Litt. « Les sources chaudes taille mammouth ». Les terrasses (ou plutôt les gours) de Mammoth hot springs ont une origine géologique assez complexe: Le site de Mammoth hot springs ne se trouve pas dans la Caldeira de Yellowstone, mais sur un substrat sédimentaire Calcaire. De l'eau chaude provenant du bassin de Norris situé à 34 km de là circule vers cette zone via un système de failles orientées nord-sud. Cette eau est chargée en Acide carbonique, ce qui lui confère la propriété de dissoudre le calcaire. Lorsque l'eau chaude chargée en calcaire émerge, une partie de l'acide carbonique s'évapore sous forme de dioxyde de carbone, et une partie du calcaire précipite, formant de gigantesques gours.
Source Own work
Author Brocken Inaglory
Camera location44° 58′ 22″ N, 110° 42′ 17″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current02:08, 5 April 2009Thumbnail for version as of 02:08, 5 April 20092,100 × 1,493 (2.17 MB)Mbz1 (talk | contribs)improved quality
01:55, 5 April 2009Thumbnail for version as of 01:55, 5 April 20092,100 × 1,493 (2.3 MB)Mbz1 (talk | contribs)improved quality
00:22, 29 March 2009Thumbnail for version as of 00:22, 29 March 20092,100 × 1,493 (2.31 MB)Mbz1 (talk | contribs)Improved quality
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