Elster glaciation

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Maximum extent of the ice sheet in Europe
Schematic diagram of the maximum glaciation of the last three cold periods on the North German Plain:
red line = extent of the Weichselian glaciation;
yellow line = extent of the Saale glaciation;
blue line = extent of the Elster glaciation

The Elster glaciation (German: Elster-Kaltzeit, Elster-Glazial or Elster-Zeit) or, less commonly, the Elsterian glaciation, in the older and popular scientific literature also called the Elster Ice Age (Elster-Eiszeit), is the oldest known ice age that resulted in the large-scale glaciation of North Germany. It occurred in the period 300 000 to 500 000 years ago. It succeeded a long period of rather warmer average temperatures, the Cromerian Complex. The Elster was followed by the Holstein interglacial and the Saale glaciation. The glacial period is named after the White Elster, a right tributary of the Saale.[1]

Controversial correlations[edit]

Traditionally, Elster was correlated with the Mindel glaciation of the Alps and the Anglian glaciation of Great Britain and Ireland. Analysis in the 1950s of oxygene isotopes in deep sea core samples introduced a global glacial history, with warm and cold phases identified by marine isotope stages (MIS). This identified two glacial stages in the time slot of the Elster/Mindel/Anglian, namely MIS 12 and MIS 10. A lack of suitable isotopes for dating the glacial deposits has made it difficult to resolve the ambiguity. This has led to an increasingly controversial issue[2] between the two main alternatives:

  • MIS 12, 478-424 ka ago,[3] is globally the stronger of the two glacials and long the preferred correlation to Elster/Mindel/Anglian. There is strong evidense for widespread glaciation of Great Britain during MIS 12, and only disputed and weak signs of glaciation during MIS 10.[4] Thus, the correlation of the Anglian glaciation to MIS 12 is uncontroversial. The glacial history of Europe is much simplified if also Elster and Mindel are correlated to MIS 12. The Subcommission on Quaternary Stratigraphy (SQS) of the International Commission on Stratigraphy (ICS), a scientific organisation within the International Union of Geological Sciences (IUGS), correlates both the Anglian and the Elsterian to MIS 12 in the 2011 version of its correlation table.[5]
  • MIS 10, 374-337 ka ago,[3] is globally a weaker glacial. A correlation of Elster to MIS 10 implies a complicated glacial history in Europe, with various geographical areas showing evidense from different glacials. However, different chronologies of separate ice strems during the late Weichselian glaciation gives credence to such a scenario.[6] In the Netherlands there is evidense for correlations of Elster to both MIS 12 and MIS 10.[7] A correlation to MIS 10 is given in the comprehensive review of the glaciations of northern Germany by Litt et al. (2007).[8] Version 2016 of the correlation table by the German Stratigraphic Commission correlates both Elster and Mindel to MIS 10.[9]

See also[edit]

References[edit]

  1. ^ Böse et al. (2012), Quaternary Glaciations of Northern Europe, Quaternary Science Reviews 44, pages 13-23.
  2. ^ Böse et al. (2012), Quaternary Glaciations of Northern Europe, Quaternary Science Reviews 44, page 18, row 16 from the bottom.
  3. ^ a b Lisiecki, Lorraine E.; Raymo, Maureen E. (2005). "A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records". Paleoceanography. 20: n/a. Bibcode:2005PalOc..20.1003L. doi:10.1029/2004PA001071.
  4. ^ Lee et al. (2011), The Glacial Histoiry of the british Isles during the early and Middle Pleistocene: Impolications for the long-term development of the British Ice Sheet, Quaternary Glaciations-Extent and Chronology, pages 59-74, Elsevier.
  5. ^ Subcommission on Quaternary Stratigraphy, Global chronostratigraphical correlation table for the last 2.7 million years, v. 2011
  6. ^ Böse et al. (2012), Quaternary Glaciations of Northern Europe, Quaternary Science Reviews 44, page 23, next-last bullet.
  7. ^ Böse et al. (2012), Quaternary Glaciations of Northern Europe, Quaternary Science Reviews 44, page 18.
  8. ^ Litt, Thomas; Behre, Karl-Ernst; Meyer, Klaus-Dieter; Stephan, Hans-Jürgen; Wansa, Stefan (2007). "Stratigraphische Begriffe für das Quartär des norddeutschen Vereisungsgebietes". Eiszeitalter und Gegenwart (Quaternary Science Journal). Hanover. 56 (1/2): 7–65. doi:10.3285/eg.56.1-2.02. ISSN 0424-7116., pages 27-28.
  9. ^ German Stratigraphic Commission: Stratigraphische Tabelle von Deutschland 2016