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Q114 (CAPF/2015) Geography › World Physical Geography › Rocks and minerals Answer Verified

‘Evaporites’ is:

Result
Your answer:  ·  Correct: A
Explanation

Evaporites are a specific group of sedimentary rocks formed through the chemical precipitation of minerals from a concentrated solution, typically due to the evaporation of water in arid environments [2]. Common examples include gypsum, halite (rock salt), and potash salts [4]. These deposits occur when water containing dissolved minerals evaporates at the mouths of springs or in salt lakes, leaving behind mineral residues [1]. In geological classification, evaporites are categorized as chemical sedimentary rocks because they result from the evaporation of large volumes of seawater or lake water. While some meteorites, such as nakhlites, may contain evaporite mineral assemblages, the term 'Evaporites' primarily refers to the rock type itself. They serve as significant indicators of past climatic and tectonic conditions, often forming in broad salt flats or restricted marine basins [1].

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 13: Types of Rocks & Rock Cycle > Chemically Formed Sedimentary Rocks > p. 171
  2. [2] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > MODE OF OCCURRENCE OF MINERALS > p. 106
  3. [4] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/sylvite
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