Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada
The morphology and chronology of exposed sublacustrine moraines is discussed. These are shown to have been formed in a sublacustrine environment. The moraines are characterized by their occurrence in large numbers within a former ice dammed lake basin and by their asymmetric cross section. Using mor...
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1974
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crcansciencepubl:10.1139/e74-036 2023-12-17T10:27:36+01:00 Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada Barnett, D. M. Holdsworth, G. 1974 http://dx.doi.org/10.1139/e74-036 http://www.nrcresearchpress.com/doi/pdf/10.1139/e74-036 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 11, issue 3, page 380-408 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1974 crcansciencepubl https://doi.org/10.1139/e74-036 2023-11-19T13:39:22Z The morphology and chronology of exposed sublacustrine moraines is discussed. These are shown to have been formed in a sublacustrine environment. The moraines are characterized by their occurrence in large numbers within a former ice dammed lake basin and by their asymmetric cross section. Using moraine volume estimates combined with the time control, a till depositional rate is calculated.A radiocarbon chronology for the Generator Lake area over the last 4500 years is presented.Hydrological relationships are established which are shown to influence the formation of sublacustrine moraines. The relationships are physically connected and are not empirical. Current studies of the calving ice front at Generator Lake show that moraines must be forming under the tapered ice ramps which flow into the lake. Measurements of debris content within the ice combined with ice flow rate measurements show that the present till supply rates are consistent with those calculated from the exposed moraine field.A model is set up which connects the lake hydrology with the existence or destruction of the ice ramps, as controlled by bending induced by buoyancy forces. The time of existence and subsequent behavior of the ramps is shown to influence the geometry and indirectly the spacing of the sublacustrine moraines. Article in Journal/Newspaper Baffin Island Baffin Northwest Territories Canadian Science Publishing (via Crossref) Northwest Territories Baffin Island Canada Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) Generator Lake ENVELOPE(-71.833,-71.833,69.600,69.600) Canadian Journal of Earth Sciences 11 3 380 408 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Barnett, D. M. Holdsworth, G. Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
The morphology and chronology of exposed sublacustrine moraines is discussed. These are shown to have been formed in a sublacustrine environment. The moraines are characterized by their occurrence in large numbers within a former ice dammed lake basin and by their asymmetric cross section. Using moraine volume estimates combined with the time control, a till depositional rate is calculated.A radiocarbon chronology for the Generator Lake area over the last 4500 years is presented.Hydrological relationships are established which are shown to influence the formation of sublacustrine moraines. The relationships are physically connected and are not empirical. Current studies of the calving ice front at Generator Lake show that moraines must be forming under the tapered ice ramps which flow into the lake. Measurements of debris content within the ice combined with ice flow rate measurements show that the present till supply rates are consistent with those calculated from the exposed moraine field.A model is set up which connects the lake hydrology with the existence or destruction of the ice ramps, as controlled by bending induced by buoyancy forces. The time of existence and subsequent behavior of the ramps is shown to influence the geometry and indirectly the spacing of the sublacustrine moraines. |
format |
Article in Journal/Newspaper |
author |
Barnett, D. M. Holdsworth, G. |
author_facet |
Barnett, D. M. Holdsworth, G. |
author_sort |
Barnett, D. M. |
title |
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
title_short |
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
title_full |
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
title_fullStr |
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
title_full_unstemmed |
Origin, Morphology, and Chronology of Sublacustrine Moraines, Generator Lake Baffin Island, Northwest Territories, Canada |
title_sort |
origin, morphology, and chronology of sublacustrine moraines, generator lake baffin island, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1974 |
url |
http://dx.doi.org/10.1139/e74-036 http://www.nrcresearchpress.com/doi/pdf/10.1139/e74-036 |
long_lat |
ENVELOPE(-68.258,-68.258,68.496,68.496) ENVELOPE(-71.833,-71.833,69.600,69.600) |
geographic |
Northwest Territories Baffin Island Canada Dammed Lake Generator Lake |
geographic_facet |
Northwest Territories Baffin Island Canada Dammed Lake Generator Lake |
genre |
Baffin Island Baffin Northwest Territories |
genre_facet |
Baffin Island Baffin Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 11, issue 3, page 380-408 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e74-036 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
11 |
container_issue |
3 |
container_start_page |
380 |
op_container_end_page |
408 |
_version_ |
1785579485856268288 |