Egesenstand

from Wikipedia, the free encyclopedia

The Egesenstand ( Egesen stage ) is the last significant ice advance in the late glacial of the Alps in the period from ~ 12,800 to ~ 11,000 years ago.

Naming and conceptual history

The Egesenstand was named by H. Kinzl (1929, 1932) after a series of moraine at the foot of the Egesen ridge in the innermost Stubai Valley (Mutterberg Valley ). Originally conceived as a later advance of the Daunstadium , the Egesenstand was recognized by H. Heuberger (1966) as an independent and extensively verifiable advance period.

Description and characterization

The Egesenstand or Egesenstadium (also Greenland Stadial-1) refers to a series of glacier advances (Egesen I, II and III) at the end of the late glacial , in which the glaciers of the Alps are smaller than in the Daunstadium, but still significantly larger than at the time of the modern era Glacier stands were. Since the Egesenstadium represents the last significant advance period before the glaciers retreated to the Holocene order, the Egesenstand also marks the transition from the late glacial to the postglacial .

The snow line (GWL = equilibrium line between nutrient and consumption area) was around 300 to 320 m lower in the wet maritime areas of the northern roofing of the Alps compared to the high glacier period around the middle of the 19th century (BZN 1850 = 2782 m) , in the dry continental Central Alps area around 220 to 180 m. At the type locality in the Stubai Alps , the height of the GWL for the Egesen maximum level is given as 2564 m, which is 218 m lower than the BZN 1850. Egesen moraines often differ from those of the daunt stage in that they are better and more cohesive in preservation, greater freshness of form and, in some cases, through greater blockiness.

Dating

The Egesen stage falls into the Younger Dryas with a maximum level of 12,300 / 12,400 cal vh , the last advances possibly reached into the beginning preboreal .

literature

  • Gross, G., Kerschner, H., Patzelt, G. (1978): Methodical studies on the snow line in alpine glacier areas. In: Zeitschrift für Gletscherkunde und Glazialgeologie, Vol. XII 'Heft 2, pp. 223-251. https://www.researchgate.net/publication/284260428
  • Kerschner, H., Ivy-Ochs, S. (2008): Palaeoclimate from glaciers: Examples from the Eastern Alps during the Alpine Lateglacial and early Holocene. In: Global and Planetary Change. Volume 60, No. 1-2, January 2008, pp. 58-71. https://www.uibk.ac.at/geographie/personal/kerschner/kerschner-perth_gpc2007.pdf
  • Patzelt, G. (1972): The late glacial stages and postglacial fluctuations of Eastern Alpine glaciers. Reports d. Duetsch. Bot. Ges. Vol. 85, H 1-4, pp. 47-57.

Individual evidence

  1. ↑ Kinzl, H. (1929): Contributions to the history of glacier fluctuations in the Eastern Alps. Magazine f. Gletscherkunde 17, 1–3; Pp. 66-121.
  2. ↑ Kinzl, H. (1932): The largest post-glacial glacier advances in the Swiss Alps and in the Mont-Blanc group. Magazine f. Glacier Science 20; Pp. 269-397.
  3. ↑ Heuberger, H. (1966): Glacier-historical studies in the Central Alps between Sellrain and Ötztal. Knowledge Alpenvereinshefte 20, 126 pp.
  4. ^ Patzelt, G. (1972): The late glacial stages and postglacial fluctuations of Eastern Alpine glaciers. Reports d. German. Bot. Ges. Vol. 85, H. 1-4, p. 49.
  5. ↑ Gross, G., Kerschner, H., Patzelt, G. (1978): Methodical studies on the snow line in alpine glacier areas. In: Journal of Glacier Science and Glacial Geology, Vol. XII, Issue 2, pp. 224, 241 and 243.
  6. ^ Patzelt, G., Bortenschlager, S. (1976): On the chronology of the late and post-glacial in the Ötztal and Inntal (Eastern Alps, Tyrol). Guide to the excursion conference d. IGCP project 73/1/24. Quaternary Glaciations in the Northern Hemisphere. Edited by B. Frenzel.
  7. ↑ Kerschner, H., Ivy-Ochs, S. (2008): Palaeoclimate from glaciers: Examples from the Eastern Alps during the Alpine Lateglacial and early Holocene. In: Global and Planetary Change. Volume 60, No. 1-2, January 2008, pp. 58-71.
  8. ↑ Gross, G., Kerschner, H., Patzelt, G. (1978): Methodical studies on the snow line in alpine glacier areas. In: Zeitschrift für Gletscherkunde und Glazialgeologie, Vol. XII 'Heft 2, p. 224.