Haslach glacial period

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The Haslach Ice Age (also Haslach Glacial , Haslach Complex or colloquially Haslach Ice Age ) is a cold period of the Pleistocene . It is not included in the traditional cold-time scheme of the Alps by Albrecht Penck and Eduard Brückner . The Cold Age was first described in 1981 by Albert Schreiner and Rudolf Ebel. The type region is the Haslach gravel in the area of ​​the Riss - Iller-Lech-Platte . The Haslach glacial followed the Günz-Haslach interglacial and was replaced by the Haslach-Mindel interglacial .

structure

The first description of the region of the northeastern Rhein glacier based on the position of the so-called highest Altendmoränen and higher younger ceiling gravel . There they are covered by the moraines of the Mindel glacial period and the so-called Tannheimer gravel , which are assigned a minimum age. The deposits of the Haslach glacial period are covered everywhere else by those of the Mindel glacial period and are therefore rarely detectable in normal cases. Since the definition of the Mindel glacial period also presents some major difficulties, the definition of the so-called Haslach-Mindel complex (also known as the gravel complex) was proposed, which combines the deposits of both glacials.

The Haslach glacial period is demarcated from the Günz glacial period by the mighty soil formations of the Günz-Haslach interglacial that formed on the Zeil gravel of the type region during this warm period . It is separated from the subsequent Mindel glacial period by what is known as the Unterpfauzenwald interglacial , which was defined in the Bad Wurzach region . In contrast to the deposits of the preceding Günz glacial period, the Haslach deposits in the area of ​​the Rheingletscher have a higher proportion of crystalline rocks , but less than those of the subsequent Mindel glacial period. In addition to the gravel and old moraines , sea clays, flowing soils and parts of the so-called top clay are also placed in the Haslach glacial period.

The chronological classification of the Haslach glacial period is not completely clear. A classification in MIS 14 is being discussed , which would mean that it would be around 500,000 to 550,000 years old. If this classification is confirmed, then the Haslach glaciation could be paralleled with the clear ice advances of the Cromer C documented in the Netherlands . However, the correlation is fraught with problems due to the knowledge that the corresponding deposits in the Netherlands were probably not controlled by climatic changes. There are similar doubts about climatic reasons for the gravel deposits, which are considered to be of the Haslach period, for the Alpine region; tectonic control is possible, for example as a result of uplift phases in the Alps.

In Switzerland the Haslach Ice Age falls in the period of the gravel glaciations and the largest glaciations .

The term is not used in Austrian geology. Any Haslach in the northern foothills of the Alps is likely to be mapped as a Mindel (moraine or younger gravel ) or otherwise simply the Middle Pleistocene .

The demarcation problems between the terrace gravel classified as Haslach and the Mindel gravel in the type area as well as the uncertainty of the connection between the Haslach gravel and glacier deposits have led to the fact that, based on the name of the Cromer complex, for the entire sequence of the Haslach and Minelas terrain forms and deposits the designation Haslach-Mindel complex was proposed. The Haslach-Mindel interglacial should then be seen as one of the several interglacials in this complex.

Occurrence

Except in the area of ​​the type region, deposits from the Haslach glacial period have not yet been reliably detectable and are generally covered by those from the Mindel glacial period. It is possible to classify the deposits in the area of ​​the Holzheuer Höhe and the Saulengrainer gravel near Apfeltrach in the area of ​​the Iller glacier in the Haslach glacial period. If this classification applies, in contrast to the type region there would also be the moraines of the Haslach glacial period on the earth's surface. Deposits from the Haslach glacial period may also appear south of Mindelheim, among others .

In the area of ​​the western Bavarian Alpine foothills between the Rhine Glacier and the Inn-Chiemsee Glacier, all traces of earlier icing were destroyed by the glaciers of the Mindel and Riss glaciers .

literature

  • KA Habbe, with the collaboration of D. Ellwanger and R. Becker-Haumann: Stratigraphic terms for the Quaternary of the southern German Alpine foothills . In: T. Litt on behalf of the German Stratigraphic Commission 2007 (Ed.): Ice Age and Present / Quaternary Science Journal . tape 56 , no. 1/2 . E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), ISSN  0424-7116 , p. 66-83 , doi : 10.3285 / e.g. 56.1-2.03 ( quaternary-science.publiss.net ).
  • T. Litt et al: The Quaternary in the Stratigraphic Table of Germany 2002 . In: Newsletters in Stratigraphy . tape 41 , no. 1-3 . Berlin, Stuttgart, p. 385–399 ( deuqua.de [PDF; 124 kB ] explanations). - Table ( deuqua.de PDF; 182 kB).

Web links

Individual evidence

  1. ^ Albrecht Penck, Eduard Brückner: The Alps in the Ice Age . 3 volumes, 1901–1909. CH Tauchnitz, Leipzig.
  2. ^ Albert Schreiner & Rudolf Ebel: Quaternary geological investigations in the vicinity of interglacial deposits in the eastern Rhine glacier area (Baden-Württemberg) . In: Geological Yearbook . A 59. Hanover 1981, p. 3-64 .
  3. ↑ Habbe 2007 , p. 76
  4. ^ A b Walter Freudenberger and Klaus Schwerd: Geological map of Bavaria 1: 500000 with explanations. 1 card + explanations + 8 supplements . 4th edition. Bavarian Geological State Office, Munich 1996, p. 238 ff .
  5. ↑ Lorraine E. Lisiecki, Maureen E. Raymo: A Plio-Pleistocene Stack of 57 Globally Distributed Benthic δ 18 O Records . In: Paleoceanography . tape 20 , 2005 ( pdx.edu ( Memento from June 16, 2011 in the Internet Archive ) [PDF; 1.1 MB ]). A Plio-Pleistocene Stack of 57 Globally Distributed Benthic δ 18 O Records ( Memento of the original from June 16, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  @1@ 2Template: Webachiv / IABot / web.pdx.edu
  6. ↑ Christian Schlüchter & Meredith Kelly: The Ice Age in Switzerland. (PDF file; 1.7 MB) (No longer available online.) Archived from the original on January 29, 2015 ; Retrieved February 20, 2010 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.landschaftundkies.ch
  7. ↑ An exception is the Weisse Nagelfluh of the Traun – Enns area , which has been identified with Haslach (Schreiner, Eberl 1981), which, however, appears problematic with regard to the extent.
    Hermann Kohl: The Ice Age in Upper Austria. Part II. The Ice Age glaciation in Upper Austria. In: Yearbook of the Upper Austrian Museum Association. Volume 143a, Linz 1998, Chapter 10 The spatial and temporal course of the Ice Age glaciation in Upper Austria , section Weisse Nagelfluh p. 379 f, whole article p. 175–390, PDF (52.6 MB) on ZOBODAT
  8. ↑ Habbe 2007 , p. 75