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To download the full resolution and other files go to: earthobservatory.nasa.gov/IOTD/view.php?id=76518&src=...

Chile’s Atacama Desert may be the driest place on Earth. Large stretches of the Atacama have gone without moisture for as long as people have been keeping track. Yet some precipitation does fall in the region, and that water helps shape the landscape.

Within this arid environment lies a salt flat, or playa, named Salar de Atacama. The Landsat 7 satellite acquired this false-color image on March 21, 2002. Red indicates vegetation, the most abundant of which occurs around springs that dot the northern edge of the saltpan. Nearby soils that support some vegetation appear tan and brown.

Although it sits at a much higher elevation, the Salar de Atacama resembles California’s Death Valley as a flat area in between mountain ranges. The little precipitation that has fallen has usually drained off the mountains and flowed into nearby valleys, creating alluvial fans.

The salt flat is a geologically young, dynamic system. Occasional floods do reach the saltpan, and flood waters carry gravel, sand, clay, and salt. Heavier materials such as gravel and sand tend to drop out of the water sooner, coming to rest outside the saltpan. Clays and salts can hitch a ride all the way to the playa.

Floods initially stir the sediments inside Salar de Atacama, but material eventually settles into layers of clay and salty water. Because the playa lacks drainage, water only leaves by evaporation. As it evaporates, salts remain behind and form crusts. Inside the saltpan, mottled light blue indicates surface salt crusts.

The white color around the perimeter of the saltpan indicates a zone of clay and carbonate-rich material that alternately forms a crust on the surface and re-dissolves with rising and falling groundwater. Northeast of the playa, white indicates something else: snow and ice on the volcanic peaks. Volcanic rocks and soils range in color from burnt orange to tan.

Around the playa, the false-color green indicates rocks that would appear red to human eyes. Blue indicates older sedimentary rocks (deposited by wind and water) and igneous rocks (formed from cooling lava or magma) that support no vegetation.

Not surprisingly, Salar de Atacama is now mined for salt, and evaporation ponds appear in the middle of the saltpan—rectangular shapes of bright turquoise and white. The salt flat also holds the potential for lithium production from its subsurface brine-bearing waters.

NASA Earth Observatory image created by Jesse Allen, using Landsat data provided by the United States Geological Survey. Caption by Michon Scott, based on image interpretation by Eric Livo and Dan Knepper, U.S. Geological Survey.

The Earth Observatory's mission is to share with the public the images, stories, and discoveries about climate and the environment that emerge from NASA research, including its satellite missions, in-the-field research, and climate models.
Date
Source Salar de Atacama, Chile
Author NASA's Earth Observatory
Camera location23° 31′ 04.92″ S, 68° 18′ 41.81″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by NASA Earth Observatory at https://www.flickr.com/photos/68824346@N02/6425749327. It was reviewed on 2 July 2012 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

2 July 2012

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23°31'4.919"S, 68°18'41.810"W

21 March 2002

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current16:28, 13 January 2021Thumbnail for version as of 16:28, 13 January 20214,007 × 4,007 (5.15 MB)Juan Villaloboshttps://earthobservatory.nasa.gov/images/76518/salar-de-atacama-chile https://eoimages.gsfc.nasa.gov/images/imagerecords/76000/76518/atacama_etm_2002080_lrg.jpg
17:18, 2 July 2012Thumbnail for version as of 17:18, 2 July 2012720 × 720 (240 KB)Dzlinker== {{int:filedesc}} == {{Information |Description=To download the full resolution and other files go to: [http://earthobservatory.nasa.gov/IOTD/view.php?id=76518&src=flickr earthobservatory.nasa.gov/IOTD/view.php?id=76518&src=...] Chile’s Atacama De...

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