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Sub-till glaciofluvial sediments at Hultsfred, South Swedish Upland

Alexanderson, Helena LU (2010) In GFF 132(3-4). p.153-159
Abstract
In a gravel pit near Hultsfred, at the eastern margin of the South Swedish Upland, gravelly, sandy and silty-sandy beds covered by a thick, stratified gravelly diamicton are exposed. Large folds and shear-planes indicate post-depositional deformation of the sorted sediments, which according to OSL dating have a maximum Middle Weichselian (60ka) age. The sand and gravel are interpreted as glaciofluvial sediments that were deposited laterally during a Middle Weichselian deglaciation, or possibly subglacially during the Late Weichselian. The large-scale deformation was due to glaciotectonics, caused by an overriding wet-based ice sheet during the last deglaciation. The subglacial hydrostatical pressure was high and led to the formation of... (More)
In a gravel pit near Hultsfred, at the eastern margin of the South Swedish Upland, gravelly, sandy and silty-sandy beds covered by a thick, stratified gravelly diamicton are exposed. Large folds and shear-planes indicate post-depositional deformation of the sorted sediments, which according to OSL dating have a maximum Middle Weichselian (60ka) age. The sand and gravel are interpreted as glaciofluvial sediments that were deposited laterally during a Middle Weichselian deglaciation, or possibly subglacially during the Late Weichselian. The large-scale deformation was due to glaciotectonics, caused by an overriding wet-based ice sheet during the last deglaciation. The subglacial hydrostatical pressure was high and led to the formation of downward-injected clastic dykes. A basal till, which forms the cover moraine in the area, caps the succession. The fairly frequent occurrence of sub-till sediments on the South Swedish Upland demonstrates the limited effect of glacial erosion in parts of this area. During the Last Glacial Maximum, the South Swedish Upland was an 'island' of slow-moving, polythermal and at least partly non-erosive ice, surrounded by faster ice-streams in the Baltic and in the Skagerrak. The ice sheet may have left its main impact on the landscape during short periods during advance and deglaciation only. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sweden, Smaland, Weichselian, glaciofluvial, glaciotectonics
in
GFF
volume
132
issue
3-4
pages
153 - 159
publisher
Taylor & Francis
external identifiers
  • wos:000284638100002
  • scopus:78649698052
ISSN
2000-0863
DOI
10.1080/11035897.2010.508134
language
English
LU publication?
no
id
cd15fdd5-5728-4ea7-9baa-0d8cbd492460 (old id 4450015)
date added to LUP
2014-05-26 09:26:33
date last changed
2018-07-08 03:12:32
@article{cd15fdd5-5728-4ea7-9baa-0d8cbd492460,
  abstract     = {In a gravel pit near Hultsfred, at the eastern margin of the South Swedish Upland, gravelly, sandy and silty-sandy beds covered by a thick, stratified gravelly diamicton are exposed. Large folds and shear-planes indicate post-depositional deformation of the sorted sediments, which according to OSL dating have a maximum Middle Weichselian (60ka) age. The sand and gravel are interpreted as glaciofluvial sediments that were deposited laterally during a Middle Weichselian deglaciation, or possibly subglacially during the Late Weichselian. The large-scale deformation was due to glaciotectonics, caused by an overriding wet-based ice sheet during the last deglaciation. The subglacial hydrostatical pressure was high and led to the formation of downward-injected clastic dykes. A basal till, which forms the cover moraine in the area, caps the succession. The fairly frequent occurrence of sub-till sediments on the South Swedish Upland demonstrates the limited effect of glacial erosion in parts of this area. During the Last Glacial Maximum, the South Swedish Upland was an 'island' of slow-moving, polythermal and at least partly non-erosive ice, surrounded by faster ice-streams in the Baltic and in the Skagerrak. The ice sheet may have left its main impact on the landscape during short periods during advance and deglaciation only.},
  author       = {Alexanderson, Helena},
  issn         = {2000-0863},
  keyword      = {Sweden,Smaland,Weichselian,glaciofluvial,glaciotectonics},
  language     = {eng},
  number       = {3-4},
  pages        = {153--159},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {Sub-till glaciofluvial sediments at Hultsfred, South Swedish Upland},
  url          = {http://dx.doi.org/10.1080/11035897.2010.508134},
  volume       = {132},
  year         = {2010},
}