Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway
The aim for this master thesis was to construct a relative sea-level curve for the area of Skånland municipality, northern Norway. The relative sea-level curve is based on the results from bio- and litostratigraphic investigations of two basins, Store Trøsevatnet (73,5 m a.s.l.) and Svartvatnet (38,...
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Format: | Master Thesis |
Language: | Norwegian Bokmål |
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The University of Bergen
2020
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Online Access: | https://hdl.handle.net/1956/21311 |
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ftunivbergen:oai:bora.uib.no:1956/21311 2023-05-15T17:43:22+02:00 Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway Lid, Kjersti Aalvik 2020-01-21T23:00:04Z application/pdf https://hdl.handle.net/1956/21311 nob nob The University of Bergen https://hdl.handle.net/1956/21311 Copyright the Author. All rights reserved isolasjonsbasseng northern norway strandforskyvning havnivå holocen sea level isolation basin 733111 Master thesis 2020 ftunivbergen 2023-03-14T17:40:55Z The aim for this master thesis was to construct a relative sea-level curve for the area of Skånland municipality, northern Norway. The relative sea-level curve is based on the results from bio- and litostratigraphic investigations of two basins, Store Trøsevatnet (73,5 m a.s.l.) and Svartvatnet (38,9 m a.s.l.), combined with results from previous work in the area. A simple type of phytoplankton analysis has been preformed on sediment cores from both basins, which is based on the fact that the composition of microscopic phytoplankton (green algae and dinoflagellate cysts) in the sediment reflects changes in the depositional environment (marine or fresh water). By using this method it was determined that Store Trøsevatnet did not qualify as an isolation basin, which indicates that the marine limit for the area must be located below 73,5 m a.s.l. For Svartvatnet, the results from the phytoplankton analysis were combined with the results from loss on ignition and X-ray fluorescence (XRF) scanning to determine the isolation contact. In total, six samples for radiocarbon dating were collected from Svartvatnet, and the isolation contact was dated to 9315 ± 100 calender years before present (cal. yr BP). One radiocarbon date was also preformed on basal sediments from Store Trøsevatnet, which gave an age of 10695 ± 205 cal. yr BP, and this represents the minimum age for when the area became deglaciated. To avoid problems related to the hard-water effect, terrestrial plant macrofossils were preferred for dating. However, two of the samples from Svartvatnet were preformed on marine material, which included a single shell of Macoma calcarea and unidentified shell fragments, respectively. Based on the results from the phytoplankton analysis, radiocarbon dating, and XRF-data, the brackish transitional phase in Svartvatnet seems to have been relatively short (2 cm), and represent a time period of about 180 years. This indicates that the rate of sea level regression was relatively fast (1,5 cm/yr) at the time of isolation. The ... Master Thesis Northern Norway Troms University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway Skånland ENVELOPE(14.355,14.355,67.175,67.175) Svartvatnet ENVELOPE(13.647,13.647,65.587,65.587) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
Norwegian Bokmål |
topic |
isolasjonsbasseng northern norway strandforskyvning havnivå holocen sea level isolation basin 733111 |
spellingShingle |
isolasjonsbasseng northern norway strandforskyvning havnivå holocen sea level isolation basin 733111 Lid, Kjersti Aalvik Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
topic_facet |
isolasjonsbasseng northern norway strandforskyvning havnivå holocen sea level isolation basin 733111 |
description |
The aim for this master thesis was to construct a relative sea-level curve for the area of Skånland municipality, northern Norway. The relative sea-level curve is based on the results from bio- and litostratigraphic investigations of two basins, Store Trøsevatnet (73,5 m a.s.l.) and Svartvatnet (38,9 m a.s.l.), combined with results from previous work in the area. A simple type of phytoplankton analysis has been preformed on sediment cores from both basins, which is based on the fact that the composition of microscopic phytoplankton (green algae and dinoflagellate cysts) in the sediment reflects changes in the depositional environment (marine or fresh water). By using this method it was determined that Store Trøsevatnet did not qualify as an isolation basin, which indicates that the marine limit for the area must be located below 73,5 m a.s.l. For Svartvatnet, the results from the phytoplankton analysis were combined with the results from loss on ignition and X-ray fluorescence (XRF) scanning to determine the isolation contact. In total, six samples for radiocarbon dating were collected from Svartvatnet, and the isolation contact was dated to 9315 ± 100 calender years before present (cal. yr BP). One radiocarbon date was also preformed on basal sediments from Store Trøsevatnet, which gave an age of 10695 ± 205 cal. yr BP, and this represents the minimum age for when the area became deglaciated. To avoid problems related to the hard-water effect, terrestrial plant macrofossils were preferred for dating. However, two of the samples from Svartvatnet were preformed on marine material, which included a single shell of Macoma calcarea and unidentified shell fragments, respectively. Based on the results from the phytoplankton analysis, radiocarbon dating, and XRF-data, the brackish transitional phase in Svartvatnet seems to have been relatively short (2 cm), and represent a time period of about 180 years. This indicates that the rate of sea level regression was relatively fast (1,5 cm/yr) at the time of isolation. The ... |
format |
Master Thesis |
author |
Lid, Kjersti Aalvik |
author_facet |
Lid, Kjersti Aalvik |
author_sort |
Lid, Kjersti Aalvik |
title |
Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
title_short |
Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
title_full |
Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
title_fullStr |
Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
title_full_unstemmed |
Holocen strandforskyvning ved Skånland, Troms / Holocene shore displacement at Skånland, Troms, northern Norway |
title_sort |
holocen strandforskyvning ved skånland, troms / holocene shore displacement at skånland, troms, northern norway |
publisher |
The University of Bergen |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/21311 |
long_lat |
ENVELOPE(14.355,14.355,67.175,67.175) ENVELOPE(13.647,13.647,65.587,65.587) |
geographic |
Norway Skånland Svartvatnet |
geographic_facet |
Norway Skånland Svartvatnet |
genre |
Northern Norway Troms |
genre_facet |
Northern Norway Troms |
op_relation |
https://hdl.handle.net/1956/21311 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766145410010710016 |