University of Sussex
Browse

File(s) not publicly available

Sand intraclast development and the deformation of glacially-overridden permafrost, West Runton

chapter
posted on 2023-06-07, 16:50 authored by Richard Waller, Julian MurtonJulian Murton, Emrys Phillips, Jonathan R Lee, Colin A Whiteman
Glacially-deformed sediments have often been observed to contain masses of sorted sediment in which delicate sedimentary structures remain preserved. These features, variously termed “lenses”, “blocks”, “intraclasts” range in surface area from a few mm2 to many tens of m2 and when extensive lead to the development of “glacial mélanges” (e.g. Menzies, 1990a,b; Hoffman and Piotrowski, 2001). Various hypotheses have been proposed to account for the inclusion of sorted-sediment masses within glacial tills. These include englacial meltwater deposition (Goodchild, 1875), basal freeze-on and transport within a debris-rich basal ice layer (e.g. Hoffman and Piotrowski, 2001) and entrainment and deformation within a subglacial deforming layer under both unfrozen (Rappol, 1987, Menzies 1990a) and partially frozen conditions (e.g. Menzies, 1990a; Waller et al., 2009; Waller et al., 2011). In spite of this previous research, their origin and significance remains the subject of debate, largely centering on the conditions required to explain the rheological contrasts inherent in glacial mélanges and the survival of cohesionless coarse-grained intraclasts within a deforming medium (e.g. Menzies 1990a,b).

History

Publication status

  • Published

Publisher

Quaternary Research Association

Page range

162-181

Book title

Glacitectonics: field guide

Department affiliated with

  • Geography Publications

Full text available

  • No

Peer reviewed?

  • Yes

Editors

Jonathan R Lee, H M Evans, Emrys Phillips

Legacy Posted Date

2012-02-06

Usage metrics

    University of Sussex (Publications)

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC