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Subglacial deformation associated with a rigid bed environment, Aberdaron, north Wales.

Subglacial deformation associated with a rigid bed environment, Aberdaron, north Wales.
Subglacial deformation associated with a rigid bed environment, Aberdaron, north Wales.
At Aberdaron, north Wales, a complex sequence of homogeneous tills and fluvial sediments overlie a hard rock base. The lower diamicton association at the bottom of the sequence consists of deformed tills and lenses of stratified sediments. It is suggested that these represent deforming bed tills and subglacial fluvial units which have been deformed together by subglacial excavational deformation. The central part of the section is marked by undeformed fluvial sediments along an unconformity which has been folded in places into a series of antiforms. It is suggested that the fluvial sediments were deposited by subglacial fluvial processes, and these three forms represent: i) canal features associated with “steady state” deforming bed conditions and a braided channel network; ii) channel features and iii) R-channels associated with rigid bed conditions. It is further suggested that this fluvial event was followed by a drumlinising event associated with fast ice flow (subglacial deforming bed erosion).
glacial, tillsedimentology., erosion, drumlin
1085-0554
1-18
Hart, Jane
e949a885-7b26-4544-9e15-32ba6f87e49a
Hart, Jane
e949a885-7b26-4544-9e15-32ba6f87e49a

Hart, Jane (1996) Subglacial deformation associated with a rigid bed environment, Aberdaron, north Wales. Journal of Glacial Geology and Geomorphology, 1 (1), 1-18.

Record type: Article

Abstract

At Aberdaron, north Wales, a complex sequence of homogeneous tills and fluvial sediments overlie a hard rock base. The lower diamicton association at the bottom of the sequence consists of deformed tills and lenses of stratified sediments. It is suggested that these represent deforming bed tills and subglacial fluvial units which have been deformed together by subglacial excavational deformation. The central part of the section is marked by undeformed fluvial sediments along an unconformity which has been folded in places into a series of antiforms. It is suggested that the fluvial sediments were deposited by subglacial fluvial processes, and these three forms represent: i) canal features associated with “steady state” deforming bed conditions and a braided channel network; ii) channel features and iii) R-channels associated with rigid bed conditions. It is further suggested that this fluvial event was followed by a drumlinising event associated with fast ice flow (subglacial deforming bed erosion).

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More information

Published date: 1996
Keywords: glacial, tillsedimentology., erosion, drumlin
Organisations: Earth Surface Dynamics

Identifiers

Local EPrints ID: 409301
URI: https://eprints.soton.ac.uk/id/eprint/409301
ISSN: 1085-0554
PURE UUID: 3fd83a2c-858b-427e-b82d-48da2b0c0ab6
ORCID for Jane Hart: ORCID iD orcid.org/0000-0002-2348-3944

Catalogue record

Date deposited: 28 May 2017 04:07
Last modified: 14 Mar 2019 01:55

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