Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway
Located near the village of Karlebotn in East Finnmark, Norway, a cluster of six gneissic monadnocks is unconformably surrounded by weakly metamorphosed sandstone strata of late Neoproterozoic age in the Smalfjord Formation. Differentiated by faults, the monadnocks were further sculpted by a glacier...
Published in: | Canadian Journal of Earth Sciences |
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Online Access: | http://dx.doi.org/10.1139/e06-058 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-058 |
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crcansciencepubl:10.1139/e06-058 2024-09-15T18:06:14+00:00 Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway Levine, Rebekah Baarli, B Gudveig Johnson, Markes E 2006 http://dx.doi.org/10.1139/e06-058 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-058 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 43, issue 8, page 1215-1228 ISSN 0008-4077 1480-3313 journal-article 2006 crcansciencepubl https://doi.org/10.1139/e06-058 2024-07-25T04:10:07Z Located near the village of Karlebotn in East Finnmark, Norway, a cluster of six gneissic monadnocks is unconformably surrounded by weakly metamorphosed sandstone strata of late Neoproterozoic age in the Smalfjord Formation. Differentiated by faults, the monadnocks were further sculpted by a glacier that flowed through a coastal valley concordant with the present-day Varangerfjorden. The largest of the monadnocks is 337 m long and 167 m wide. There remains ample evidence of glacial activity associated with this feature. Relict lodgement tillites are preserved on the west side of the monadnock, flowtillites on the steep surfaces of the north and southwest sides, and a small esker directly on top. The valley was later inundated due to glacial eustacy, and the Karlebotn monadnocks became an archipelago in a shallow estuary of a broad fjord. Interpretation of exposed versus sheltered rocky shores on opposite sides of the largest monadnock island is supported by mineralogical variations in basal strata along the unconformity and evidence of paleocurrents. Greater water energy was concentrated on the southeast side, where a small sandy beach developed. Water energy must have been minimal on the north side because of a general lack of reworking and winnowing of till when the rocky shore was inundated. Article in Journal/Newspaper Finnmark glacier Karlebotn Northern Norway Varangerfjord* Varangerfjorden Finnmark Canadian Science Publishing Canadian Journal of Earth Sciences 43 8 1215 1228 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Located near the village of Karlebotn in East Finnmark, Norway, a cluster of six gneissic monadnocks is unconformably surrounded by weakly metamorphosed sandstone strata of late Neoproterozoic age in the Smalfjord Formation. Differentiated by faults, the monadnocks were further sculpted by a glacier that flowed through a coastal valley concordant with the present-day Varangerfjorden. The largest of the monadnocks is 337 m long and 167 m wide. There remains ample evidence of glacial activity associated with this feature. Relict lodgement tillites are preserved on the west side of the monadnock, flowtillites on the steep surfaces of the north and southwest sides, and a small esker directly on top. The valley was later inundated due to glacial eustacy, and the Karlebotn monadnocks became an archipelago in a shallow estuary of a broad fjord. Interpretation of exposed versus sheltered rocky shores on opposite sides of the largest monadnock island is supported by mineralogical variations in basal strata along the unconformity and evidence of paleocurrents. Greater water energy was concentrated on the southeast side, where a small sandy beach developed. Water energy must have been minimal on the north side because of a general lack of reworking and winnowing of till when the rocky shore was inundated. |
format |
Article in Journal/Newspaper |
author |
Levine, Rebekah Baarli, B Gudveig Johnson, Markes E |
spellingShingle |
Levine, Rebekah Baarli, B Gudveig Johnson, Markes E Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
author_facet |
Levine, Rebekah Baarli, B Gudveig Johnson, Markes E |
author_sort |
Levine, Rebekah |
title |
Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
title_short |
Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
title_full |
Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
title_fullStr |
Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
title_full_unstemmed |
Glacial and rocky-shore dynamics of the Karlebotn monadnocks: late Neoproterozoic of northern Norway |
title_sort |
glacial and rocky-shore dynamics of the karlebotn monadnocks: late neoproterozoic of northern norway |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/e06-058 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-058 |
genre |
Finnmark glacier Karlebotn Northern Norway Varangerfjord* Varangerfjorden Finnmark |
genre_facet |
Finnmark glacier Karlebotn Northern Norway Varangerfjord* Varangerfjorden Finnmark |
op_source |
Canadian Journal of Earth Sciences volume 43, issue 8, page 1215-1228 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e06-058 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
43 |
container_issue |
8 |
container_start_page |
1215 |
op_container_end_page |
1228 |
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1810443713336311808 |