Corrosion (geology)

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Of corrosion is in the geology spoken when rock forming mineral chemically dissolves. This requires a solvent (usually water, in nature often in the form of a weak carbonic acid ) in which the mineral dissolves and is then present in an ionized state. As a result, considerable cavities can form on the surface of the earth, but also in the depths due to water, the type of landscape is commonly known as karst .

The corrosion stops when the solvent has reached its solvency ( saturation concentration ).

Subterranean mixing of saturated water with different CO 2 partial pressures can restore the ability to dissolve, which in some cases can create very large cavities in the carbonate karst (lime) ( mixed corrosion ).

They dissolve the quartz in sandstones and granites extremely slowly and lead to sandstone karst or silicate karst. This form of corrosion is worldwide for the formation of sandstone caves and carts on granite rocks e.g. B. Seychelles causal.

literature

  • Ludwig Bendel: engineering geology. A manual for study and practice, Part One, Springer Verlag, Vienna 1944.
  • Dieter Richter: General Geology. 4th edition, De Gruyter, Berlin 1992.

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