evaporite


evaporite
/i vap"euh ruyt'/, n. Geol.
any sedimentary rock, as gypsum or rock salt, formed by precipitation from evaporating seawater.
[1920-25; EVAPOR(ATION) + -ITE1]

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Any of a variety of minerals found in sedimentary deposits of soluble salts that result from the evaporation of water.

Typically, evaporite deposits occur in closed marine basins where evaporation exceeds inflow. The most important such minerals include anhydrite, halite, calcite, gypsum, polyhalite, and potassium and magnesium salts such as sylvite, carnallite, kainite, and kieserite.

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 any of a variety of individual minerals found in the sedimentary deposit of soluble salts that results from the evaporation of water.

      A brief treatment of evaporite deposits and their constituent minerals follows. For full treatment, see sedimentary rock: Evaporites (sedimentary rock).

      Typically, evaporite deposits occur in closed marine basins where evaporation exceeds inflow. The deposits often show a repeated sequence of minerals, indicating cyclic conditions with a mineralogy determined by solubility. The most important minerals and the sequence in which they form include calcite, gypsum, anhydrite, halite, polyhalite, and lastly potassium and magnesium salts such as sylvite, carnallite, kainite, and kieserite; anhydrite and halite dominate. These sequences have been reproduced in laboratory experiments and, therefore, the physical and chemical conditions for evaporite formation are well known.

      In contrast to basin deposits, extensive thin-shelf deposits are known and are thought to be the result of shallow, ephemeral seas. Non-marine evaporites formed by streams flowing into closed depressions, especially in arid regions, give rise to deposits of borates, nitrates, and sodium carbonates. Such deposits occur in Utah and southern California in the United States.

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Universalium. 2010.

Look at other dictionaries:

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  • evaporite — [ē vap′ə rīt΄, ivap′ə rīt΄] n. a type of sedimentary rock, as halite or gypsum, formed by the evaporation of salt water …   English World dictionary

  • Evaporite — Cobble encrusted with halite evaporated from the Dead Sea, Israel. Evaporite (  / …   Wikipedia

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  • evaporite — noun Etymology: evaporation + 1 ite Date: 1924 a sedimentary rock (as gypsum) that originates by evaporation of seawater in an enclosed basin • evaporitic adjective …   New Collegiate Dictionary

  • Evaporite — Evaporit (von engl. evaporation = dt. Verdampfen) bezeichnet Verdampfungs und Eindunstungsgestein, das als chemisches Sediment überwiegend in der kontinentalen Erdkruste vorkommt und das sich durch fortschreitende Wasserverdunstung (Evaporation)… …   Deutsch Wikipedia

  • evaporite — noun The salty, crusty, sediment that remains after sea water evaporates …   Wiktionary

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  • evaporite —    Rock formed by precipitation of minerals from evaporating water, usually from sea water. As sea water evaporates the least soluble mineral contents precipitate first; these include calcium carbonate that is deposited as fine grained limestone …   Lexicon of Cave and Karst Terminology


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