Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Chemical Precipitation


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Comment: 07:05 - 07:42 (00:37)

Source: Annenberg/CPB Resources - Earth Revealed - 17. Sedimentary Rocks: The Key to Past Environments

Keywords: "sedimentary rock", "chemical sedimentation", lithification, "chemical precipitation", water, desert, lake, lagoon, evaporation, calcite, gypsum, salt, evaporite

Our transcription: In contrast to lithification, sedimentary rocks may also form from the precipitation of chemicals out of water.

One common site of chemical sedimentation is desert lakes and lagoons.

As evaporation occurs, the chemicals becoming increasingly concentrated in the water until they can no longer remain dissolved.

They combine with one another forming minerals such as calcite, gypsum, and salt.

Deposits formed from evaporation are called "evaporites."

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/16.01.09.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:31:38 PST 2008 (wcs)