Grand Canyon of the Yellowstone
The Grand Canyon of the Yellowstone is a large
canyonof the Yellowstone Riverthat is located in Yellowstone National Parkin the United States. The canyon is up to 900 feet deep (275 m) and a half mile (0.8 km) in width. It is not the canyon more commonly known as the Grand Canyon, which is located in the state of Arizona.
The specifics of the
geologyof the canyon are not well understood, except that it is an erosional feature rather than the result of glaciation. After the Yellowstone Calderaeruption of about 600,000 years ago, the area was covered by a series of lavaflows. The area was also faulted by the doming action of the calderabefore the eruption. The site of the present canyon, as well as any previous canyons, was probably the result of this uplift and related faulting , which allowed erosion to proceed at an accelerated rate. The area was also covered by the glaciers that formed during several ice ages. Glacial deposits probably filled the canyon at one time, but have since been eroded away, leaving little or no evidence of their presence.
The canyon below the Lower
Yellowstone Fallswas at one time the site of a geyserbasin that was the result of rhyolitelava flows, extensive faulting, and heat beneath the surface (related to the hot spot). No one is sure exactly when the geyser basin was formed in the area, although it was probably present at the time of the last glaciation. The chemical and heat action of the geyser basin caused the rhyolite rock to become hydrothermally altered, making it very soft and brittle and more easily erodible (sometimes likened to baking a potato). Evidence of this thermal activity still exists in the canyon in the form of geysers and hot springs that are still active and visible. The Clear Lake area, which is fed by hot springs, south of the canyon is probably also a remnant of this activity.According to Ken Pierce, U.S. Geological Survey geologist, at the end of the last glacial period, about 14,000 to 18,000 years ago, ice dams formed at the mouth of Yellowstone Lake. When the ice dams melted, a great volume of water was released downstream causing massive flash floods and immediate and catastrophic erosion of the present-day canyon. These flash floods probably happened more than once. The canyon is a classic V-shaped valley, indicative of river-type erosion rather than glaciation. Today the canyon is still being eroded by the Yellowstone River.
colors in the canyon are also a result of hydrothermal alteration. The rhyolite in the canyon contains a variety of different ironcompounds. When the old geyser basin was active, the "cooking" of the rock caused chemical alterations in these iron compounds. Exposure to the elements caused the rocks to change colors. The rocks are oxidizing; in effect, the canyon is rusting. The colors indicate the presence or absence of waterin the individual iron compounds. Most of the yellows in the canyon are the result of iron present in the rock rather than sulfur, as many people think.
*"Initial article based on
public domaintext from the National Park Service. [http://www.nps.gov/yell/nature/geology/geocanyn.htm] "
Wikimedia Foundation. 2010.
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