Superimposed deformation in glaciotectonics

Stig Asbjørn Schack Pedersen

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47 Citations (Scopus)

Abstract

The identification of glaciotectonic structures is an exclusive field for the struc-tural geologist. The structures comprise a series of different types and regimes. The sequential development of the glaciotectonic structures reflects superim-posed subglacial and proglacial deformation processes. The glaciotectonic struc-tures may involve earlier formed structures thus superimposed by the glaciotec-tonics, or the glaciotectonic structures may eventually be overprinted by neotec-tonic deformations. Four different superimposed settings may be distinguished: 1) glaciotectonic deformation superimposed on pre-Quaternary tectonics, 2) gla-ciotectonic deformation superimposed on earlier formed glaciotectonic struc-tures (superimposed deformation involving two or more glaciodynamic events), 3) glaciotectonic deformations superimposed sequentially in the same glaciotec-tonic unit (two or more glaciotectonic phases in the same glaciodynamic event), and finally 4) neotectonic deformation superimposed on glaciotectonic struc-tures. Examples of type 1 are taken from the deformed Palaeogene diatomites with ash layers at Hanklit, Mors, and Hestegården, Fur. Dokumentation of gla-ciotectonic deformation superimposed on halokinetic structures is demonstrated from Erslev, Mors, and further examplified by structures occurring at Junget on the north side of the Batum salt diapir in Sailing. Type 2 is examplified by gla-ciotectonic structures in the Skarrehage mo-clay pit on Mors. An example of Elsterian glaciotectonics superimposed by Saalian glaciotectonics is recorded from the hilly island Moborg, central part of western Jylland. The classic glacio-tectonic site Møns Klint is described as a combination of an imbricate fan and an antiformal stack formed by the Young Baltic ice advance in the Late Weichselian superimposed by a regressional re-advance from the east. Type 3 is exemplified by the glaciotectonic complex at Feggeklit. Type 4 is described from the island of Fur where glaciotectonic structures are cut by neotectonic faults roughly par-allel to the main E-W trend of Limfjorden.

Original languageEnglish
Pages (from-to)125-144
Number of pages20
JournalBulletin of the Geological Society of Denmark
Volume46
Issue number2
Publication statusPublished - 1999
Externally publishedYes

Keywords

  • Glaciotectonics
  • Quaternary geology
  • Structural geology
  • Superimposed deformation

Programme Area

  • Programme Area 5: Nature and Climate

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