Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland
In the Tempo Valley, north‐central Ireland, flat‐lying calcareous concretions are found within massive sand beds of glaciofluvial outwash which were deposited during the late Weichselian deglacial cycle. ( c . 17 000 14 000 BP). Morphologically, concretions (< 20 cm long. I I cm wide, 3 cm th...
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crwiley:10.1111/j.1502-3885.1998.tb00869.x 2023-12-03T10:24:03+01:00 Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland KNIGHT, JASPER 1998 http://dx.doi.org/10.1111/j.1502-3885.1998.tb00869.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1998.tb00869.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1998.tb00869.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 27, issue 2, page 81-87 ISSN 0300-9483 1502-3885 Geology Archeology Ecology, Evolution, Behavior and Systematics journal-article 1998 crwiley https://doi.org/10.1111/j.1502-3885.1998.tb00869.x 2023-11-09T13:45:08Z In the Tempo Valley, north‐central Ireland, flat‐lying calcareous concretions are found within massive sand beds of glaciofluvial outwash which were deposited during the late Weichselian deglacial cycle. ( c . 17 000 14 000 BP). Morphologically, concretions (< 20 cm long. I I cm wide, 3 cm thick) arc bladcd to disc‐shaped, lie parallel to sediment bedding planes, and have long axes aligned perpendicular to ice retreat direction. Internally, concretions are massive to framework‐supported and were formed as calcareous cements precipitated from solute‐rich groundwatcrs. Concretions, related to steep groundwater gradients and vigorous groundwater circulation cells, were formed proglacially at the base of a thin (1.5‐2.0 m deep) layer of discontinuous permafrost as meltwater was actively expelled from the retreating ice margin. The presence of a discontinuous permafrost substrate can also help explain regional‐scale geomorphic patterns indicating stagnation zone retreat of the Tempo Valley ice mass. Article in Journal/Newspaper Ice permafrost Wiley Online Library (via Crossref) Boreas 27 2 81 87 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Geology Archeology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Geology Archeology Ecology, Evolution, Behavior and Systematics KNIGHT, JASPER Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
topic_facet |
Geology Archeology Ecology, Evolution, Behavior and Systematics |
description |
In the Tempo Valley, north‐central Ireland, flat‐lying calcareous concretions are found within massive sand beds of glaciofluvial outwash which were deposited during the late Weichselian deglacial cycle. ( c . 17 000 14 000 BP). Morphologically, concretions (< 20 cm long. I I cm wide, 3 cm thick) arc bladcd to disc‐shaped, lie parallel to sediment bedding planes, and have long axes aligned perpendicular to ice retreat direction. Internally, concretions are massive to framework‐supported and were formed as calcareous cements precipitated from solute‐rich groundwatcrs. Concretions, related to steep groundwater gradients and vigorous groundwater circulation cells, were formed proglacially at the base of a thin (1.5‐2.0 m deep) layer of discontinuous permafrost as meltwater was actively expelled from the retreating ice margin. The presence of a discontinuous permafrost substrate can also help explain regional‐scale geomorphic patterns indicating stagnation zone retreat of the Tempo Valley ice mass. |
format |
Article in Journal/Newspaper |
author |
KNIGHT, JASPER |
author_facet |
KNIGHT, JASPER |
author_sort |
KNIGHT, JASPER |
title |
Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
title_short |
Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
title_full |
Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
title_fullStr |
Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
title_full_unstemmed |
Origin and significance of calcareous concretions within glacial outwash in the Tempo Valley, north‐central Ireland |
title_sort |
origin and significance of calcareous concretions within glacial outwash in the tempo valley, north‐central ireland |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1502-3885.1998.tb00869.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1998.tb00869.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1998.tb00869.x |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Boreas volume 27, issue 2, page 81-87 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1502-3885.1998.tb00869.x |
container_title |
Boreas |
container_volume |
27 |
container_issue |
2 |
container_start_page |
81 |
op_container_end_page |
87 |
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1784272362866212864 |