Regression (geology)

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Schematic representation of the displacement of the facies belt during a transgression (above) and during a regression (below). The regression figure shows the case of a “forced regression”. As a rule, in such a case the more landward sediments, which were still deposited when the regression began, are at least partially eroded during the low sea level .

As regression (from Latin. Regredior, regress) is in the geology , the seaward retreat a coastline and the thus caused changes in the Sedimentationsdynamik the affected sedimentary basin designated. A regression can result from the progressive pouring of sediments into the coastal area of ​​a land mass ( normal regression , see → Progradation ), the tectonic increase of a land mass or a lowering of the global ( eustatic ) sea level, e.g. B. be due to the climatic binding of water in continental ice masses (both English. Forced regression ).

A regression is expressed in the sediment sequence by a reversal of z. B. a more marine deposition environment to a more terrestrial deposition environment or not infrequently in the form of layer gaps .

In contrast, there is transgression , in which the coastline migrates inland.

literature

  • Hans Murawski: Geological Dictionary . 8th edition. Enke Verlag, Stuttgart 1983, ISBN 978-3-432-84108-3 , p. 181 .
  • Dieter Richter: General Geology . 3. Edition. de Gruyter Verlag, Berlin - New York 1985, ISBN 3-11-010416-4 , pp. 191 .

Web links

  • Keyword regression in the Schlumberger Oilfield Glossary on the Stratigraphy website of the Society for Sedimentary Geology