Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie
The stratigraphy of surficial deposits located in a snow-patch site, at an altitude of 1200 m in the Mount Jacques-Cartier area, provides evidence of a Late Glacial to mid-Holocene deglaciation. During the Late Glacial, or at the beginning of the Holocene, the diamictons on the high summits of the M...
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Language: | English |
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Canadian Science Publishing
1984
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Online Access: | http://dx.doi.org/10.1139/e84-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e84-034 |
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crcansciencepubl:10.1139/e84-034 2024-05-19T07:49:39+00:00 Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie Payette, Serge Boudreau, Francis 1984 http://dx.doi.org/10.1139/e84-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e84-034 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 21, issue 3, page 319-335 ISSN 0008-4077 1480-3313 journal-article 1984 crcansciencepubl https://doi.org/10.1139/e84-034 2024-04-25T06:51:59Z The stratigraphy of surficial deposits located in a snow-patch site, at an altitude of 1200 m in the Mount Jacques-Cartier area, provides evidence of a Late Glacial to mid-Holocene deglaciation. During the Late Glacial, or at the beginning of the Holocene, the diamictons on the high summits of the McGerrigle Mountains were affected by a severe periglacial climate, responsible for the formation of most of the periglacial landforms, such as sorted polygons, sorted stripes, stone-banked lobes, and block fields. During the Holocene, these landforms were fossilized by vegetation, and podzolic soil profiles developed within the stony deposits. After the Hypsithermal, a cooling trend was registered in snow-patch sites, where gelifluction was active after ca. 5200, 3470 – 3340, 2500, 2100, 1860, 1490, and 650 BP. Subalpine meadows followed the opening of the forest, at least since 2200 BP, and were due to neoglacial cooling. Within the alpine belt, the coniferous cover regression is registered at least since 1400 BP. During the so-called Little Ice Age of the past centuries, conifers retracted because of periglacial activity, which was followed by the formation of sorted stripes and gelifluction lobes. The extinction of tree species in the alpine tundra is related to periglacial activity, an ecological situation rather specific to the high summits of Gaspé. Article in Journal/Newspaper Tundra Canadian Science Publishing Canadian Journal of Earth Sciences 21 3 319 335 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The stratigraphy of surficial deposits located in a snow-patch site, at an altitude of 1200 m in the Mount Jacques-Cartier area, provides evidence of a Late Glacial to mid-Holocene deglaciation. During the Late Glacial, or at the beginning of the Holocene, the diamictons on the high summits of the McGerrigle Mountains were affected by a severe periglacial climate, responsible for the formation of most of the periglacial landforms, such as sorted polygons, sorted stripes, stone-banked lobes, and block fields. During the Holocene, these landforms were fossilized by vegetation, and podzolic soil profiles developed within the stony deposits. After the Hypsithermal, a cooling trend was registered in snow-patch sites, where gelifluction was active after ca. 5200, 3470 – 3340, 2500, 2100, 1860, 1490, and 650 BP. Subalpine meadows followed the opening of the forest, at least since 2200 BP, and were due to neoglacial cooling. Within the alpine belt, the coniferous cover regression is registered at least since 1400 BP. During the so-called Little Ice Age of the past centuries, conifers retracted because of periglacial activity, which was followed by the formation of sorted stripes and gelifluction lobes. The extinction of tree species in the alpine tundra is related to periglacial activity, an ecological situation rather specific to the high summits of Gaspé. |
format |
Article in Journal/Newspaper |
author |
Payette, Serge Boudreau, Francis |
spellingShingle |
Payette, Serge Boudreau, Francis Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
author_facet |
Payette, Serge Boudreau, Francis |
author_sort |
Payette, Serge |
title |
Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
title_short |
Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
title_full |
Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
title_fullStr |
Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
title_full_unstemmed |
Évolution postglaciaire des hauts sommets alpins et subalpins de la Gaspésie |
title_sort |
évolution postglaciaire des hauts sommets alpins et subalpins de la gaspésie |
publisher |
Canadian Science Publishing |
publishDate |
1984 |
url |
http://dx.doi.org/10.1139/e84-034 http://www.nrcresearchpress.com/doi/pdf/10.1139/e84-034 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Canadian Journal of Earth Sciences volume 21, issue 3, page 319-335 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e84-034 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
21 |
container_issue |
3 |
container_start_page |
319 |
op_container_end_page |
335 |
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1799468171401363456 |