Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard
The following study investigate the vertical changes in fluvial channel and interchannel geometry and facies architecture of the Aspelintoppen Formation in the Cenozoic Central Basin on Svalbard. Sedimentary structures was predominantly developed by unidirectional traction currents. The channelized...
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The University of Bergen
2015
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ftunivbergen:oai:bora.uib.no:1956/9286 2023-05-15T18:29:42+02:00 Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard Naurstad, Olav Aleksander 2015-01-27T13:51:01Z 29793916 bytes application/pdf https://hdl.handle.net/1956/9286 eng eng The University of Bergen https://hdl.handle.net/1956/9286 Copyright the author. All rights reserved Geologi Svalbard sedimentologi http://data.ub.uio.no/realfagstermer/c030202 http://data.ub.uio.no/realfagstermer/c013425 http://data.ub.uio.no/realfagstermer/c011646 756199 Master thesis 2015 ftunivbergen 2023-03-14T17:44:56Z The following study investigate the vertical changes in fluvial channel and interchannel geometry and facies architecture of the Aspelintoppen Formation in the Cenozoic Central Basin on Svalbard. Sedimentary structures was predominantly developed by unidirectional traction currents. The channelized sandstone bodies are ribbon shaped and is characterized by low sinuosity. This architecture was promoted by cohesive banks that limiting lateral accretion and resulted in channel fill dominated by vertical aggradation of dunes and bars. The studied section shows a clear dominance of interchannel sheet sandstone and laminated mudstone deposits, which volumetrically comprises five times as much deposits as fluvial channels. Abundance of leaf imprints, roots traces and ichnotaxa assemblages of the Scoyenia and Mermia ichnofacies, indicates lateral extensive and highly vegetated swamps, and ephemeral lakes, which are suggested to be flooded for longer periods of time. Evolution of the sedimentary infill is best explained by high floodplain aggradation and shifting of main channel segments triggered by base-level changes, resulting in channel avulsion. Aggradational rates are reflected by the high degree of channel avulsion and large thickness of vertically connected crevasse splay complexes. Syn-tectonic deposition during uplift of the West Spitsbergen fold-and-thrust belt and foreland basin subsidence promoted a relatively high gradient of the fluvial system, resulting in great volumes of sediments being transported to the floodplain and bypassed to the basin. Base-level changes favourable for avulsion of major channel segments (trunk and major distributary channels) is subsequently promoted by high floodplain aggradation and possibly by sea-level rise, influencing distal parts of the fluvial system and/or by high stream flow breaching channel banks, redirecting the channel to a more preferred location. Characteristics of the studied succession points to a sedimentary basin with high sedimentation rates and subsidence ... Master Thesis Svalbard Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Aspelintoppen ENVELOPE(16.750,16.750,77.767,77.767) Central Basin ENVELOPE(43.000,43.000,73.500,73.500) Svalbard |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Geologi Svalbard sedimentologi http://data.ub.uio.no/realfagstermer/c030202 http://data.ub.uio.no/realfagstermer/c013425 http://data.ub.uio.no/realfagstermer/c011646 756199 |
spellingShingle |
Geologi Svalbard sedimentologi http://data.ub.uio.no/realfagstermer/c030202 http://data.ub.uio.no/realfagstermer/c013425 http://data.ub.uio.no/realfagstermer/c011646 756199 Naurstad, Olav Aleksander Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
topic_facet |
Geologi Svalbard sedimentologi http://data.ub.uio.no/realfagstermer/c030202 http://data.ub.uio.no/realfagstermer/c013425 http://data.ub.uio.no/realfagstermer/c011646 756199 |
description |
The following study investigate the vertical changes in fluvial channel and interchannel geometry and facies architecture of the Aspelintoppen Formation in the Cenozoic Central Basin on Svalbard. Sedimentary structures was predominantly developed by unidirectional traction currents. The channelized sandstone bodies are ribbon shaped and is characterized by low sinuosity. This architecture was promoted by cohesive banks that limiting lateral accretion and resulted in channel fill dominated by vertical aggradation of dunes and bars. The studied section shows a clear dominance of interchannel sheet sandstone and laminated mudstone deposits, which volumetrically comprises five times as much deposits as fluvial channels. Abundance of leaf imprints, roots traces and ichnotaxa assemblages of the Scoyenia and Mermia ichnofacies, indicates lateral extensive and highly vegetated swamps, and ephemeral lakes, which are suggested to be flooded for longer periods of time. Evolution of the sedimentary infill is best explained by high floodplain aggradation and shifting of main channel segments triggered by base-level changes, resulting in channel avulsion. Aggradational rates are reflected by the high degree of channel avulsion and large thickness of vertically connected crevasse splay complexes. Syn-tectonic deposition during uplift of the West Spitsbergen fold-and-thrust belt and foreland basin subsidence promoted a relatively high gradient of the fluvial system, resulting in great volumes of sediments being transported to the floodplain and bypassed to the basin. Base-level changes favourable for avulsion of major channel segments (trunk and major distributary channels) is subsequently promoted by high floodplain aggradation and possibly by sea-level rise, influencing distal parts of the fluvial system and/or by high stream flow breaching channel banks, redirecting the channel to a more preferred location. Characteristics of the studied succession points to a sedimentary basin with high sedimentation rates and subsidence ... |
format |
Master Thesis |
author |
Naurstad, Olav Aleksander |
author_facet |
Naurstad, Olav Aleksander |
author_sort |
Naurstad, Olav Aleksander |
title |
Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
title_short |
Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
title_full |
Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
title_fullStr |
Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
title_full_unstemmed |
Sedimentology of the Aspelintoppen Formation (Eocene-Oligocene), Brogniartfjella, Svalbard |
title_sort |
sedimentology of the aspelintoppen formation (eocene-oligocene), brogniartfjella, svalbard |
publisher |
The University of Bergen |
publishDate |
2015 |
url |
https://hdl.handle.net/1956/9286 |
long_lat |
ENVELOPE(16.750,16.750,77.767,77.767) ENVELOPE(43.000,43.000,73.500,73.500) |
geographic |
Aspelintoppen Central Basin Svalbard |
geographic_facet |
Aspelintoppen Central Basin Svalbard |
genre |
Svalbard Spitsbergen |
genre_facet |
Svalbard Spitsbergen |
op_relation |
https://hdl.handle.net/1956/9286 |
op_rights |
Copyright the author. All rights reserved |
_version_ |
1766213009966891008 |