Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till
Glacier ice has been always considered to be the geologic agent that forms and deposits till. However, the reality is more complex: meltwater and gravity participate to various degrees at the formation, deposition and penecontemporaneous redeposition of till, even though the glacier is the principal...
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Universitat de Barcelona
1983
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ftubarceojs:oai:revistes.ub.edu:article/4303 2023-05-15T16:20:27+02:00 Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till DREIMANIS, A. 1983-01-13 text/html application/pdf http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303 eng eng Universitat de Barcelona http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303/5316 http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303/5317 http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303 Acta Geologica Hispanica; Vol.: 18 Núm.: 3 -4; 153-160 2173-6537 0567-7505 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1983 ftubarceojs 2022-12-26T13:38:58Z Glacier ice has been always considered to be the geologic agent that forms and deposits till. However, the reality is more complex: meltwater and gravity participate to various degrees at the formation, deposition and penecontemporaneous redeposition of till, even though the glacier is the principal agent and thedeposition of till takes place in contact or near-contact with glacier ice. Boulton's (1980) and Lawson's (1981) cntena for the differentiation of "tills" from "nontills" are tested here, by using mainly their own data on glacial sedimentation and penecontemporaneous resedimentation at Breidamerkurjokull, Iceland, and Matanuska Glacier, Alaska, but re-interpreting some of their conclusions or pointing out some discrepancies in their own conclusions. A strict adherence to some of Boulton's (1980) and Lawson's (1981) critetia would not permit calling most of Matanuska Glacier's melt-out tills, and the Breidamerkurjokull, lodgement till, particularly its dilated top portion, a true till. However, they may be considered tills, if the broad definition of: "Till is a sediment that has been transported and subsequently deposited by or from glacier ice, with little or no sorting by water" is applied instead. Article in Journal/Newspaper glacier glacier Iceland Alaska Revistes Científiques de la Universitat de Barcelona |
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Revistes Científiques de la Universitat de Barcelona |
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language |
English |
description |
Glacier ice has been always considered to be the geologic agent that forms and deposits till. However, the reality is more complex: meltwater and gravity participate to various degrees at the formation, deposition and penecontemporaneous redeposition of till, even though the glacier is the principal agent and thedeposition of till takes place in contact or near-contact with glacier ice. Boulton's (1980) and Lawson's (1981) cntena for the differentiation of "tills" from "nontills" are tested here, by using mainly their own data on glacial sedimentation and penecontemporaneous resedimentation at Breidamerkurjokull, Iceland, and Matanuska Glacier, Alaska, but re-interpreting some of their conclusions or pointing out some discrepancies in their own conclusions. A strict adherence to some of Boulton's (1980) and Lawson's (1981) critetia would not permit calling most of Matanuska Glacier's melt-out tills, and the Breidamerkurjokull, lodgement till, particularly its dilated top portion, a true till. However, they may be considered tills, if the broad definition of: "Till is a sediment that has been transported and subsequently deposited by or from glacier ice, with little or no sorting by water" is applied instead. |
format |
Article in Journal/Newspaper |
author |
DREIMANIS, A. |
spellingShingle |
DREIMANIS, A. Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
author_facet |
DREIMANIS, A. |
author_sort |
DREIMANIS, A. |
title |
Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
title_short |
Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
title_full |
Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
title_fullStr |
Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
title_full_unstemmed |
Penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
title_sort |
penecontemporaneous partial disaggregationand/or resedimentation during the formation and deposition of subglacial till |
publisher |
Universitat de Barcelona |
publishDate |
1983 |
url |
http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303 |
genre |
glacier glacier Iceland Alaska |
genre_facet |
glacier glacier Iceland Alaska |
op_source |
Acta Geologica Hispanica; Vol.: 18 Núm.: 3 -4; 153-160 2173-6537 0567-7505 |
op_relation |
http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303/5316 http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303/5317 http://revistes.ub.edu/index.php/ActaGeologica/article/view/4303 |
_version_ |
1766008362944692224 |