Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement
The late Cenozoic evolution of the southwestern Barents Sea shelf includes periods of uplift, erosion and glaciations. This part of the stratigraphy has been studied using 2D and 3D seismic data, with emphasis on the interplay between uplift, erosion and glaciations and salt movement. The study area...
Main Author: | |
---|---|
Format: | Master Thesis |
Language: | English |
Published: |
UiT Norges arktiske universitet
2019
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/18314 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/18314 |
---|---|
record_format |
openpolar |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/18314 2023-05-15T15:38:57+02:00 Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement Martinsen, Birgitta Saue 2019-05-15 https://hdl.handle.net/10037/18314 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/18314 openAccess Copyright 2019 The Author(s) VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 GEO-3900 Master thesis Mastergradsoppgave 2019 ftunivtroemsoe 2021-06-25T17:57:25Z The late Cenozoic evolution of the southwestern Barents Sea shelf includes periods of uplift, erosion and glaciations. This part of the stratigraphy has been studied using 2D and 3D seismic data, with emphasis on the interplay between uplift, erosion and glaciations and salt movement. The study area comprises the Svalis, Samson and Norvarg domes and the Nordkapp Basin, where halokinesis has been a major influence on the tectonostratigraphic evolution. The study includes systemization and categorization of the timing of salt activity relative to the erosion of the shelf, in the Nordkapp Basin, and on the Svalis, Samson and Norvarg domes. Very late to almost recent salt movement has occurred within some of the diapirs in the Nordkapp Basin and the Svalis Dome, evidenced by uplift of the Upper Regional Unconformity (URU) surface and the seafloor above the salt. Furthermore, the study reveals significant local variations in salt movement of the diapirs in the Nordkapp Basin, with a trend of more late salt movement towards the northeast. This is possibly attributed to a larger original salt thickness in this part of the basin compared to in the southwest. A mini-basin filled with glacigenic sediments is found adjacent to the Svalis Dome, and this is assumed to be a result of a combination of deeper glacial erosion of less resistant strata on the Loppa High, and less exposure to erosion due to the continuous salt rise and elevation of the adjacent dome. The Norvarg and Samson domes are not found to be influenced by late Cenozoic salt movement, which is attributed to factors such as original salt thickness, overburden strength and early Cenozoic erosion. Spatial variations in lithology due to salt-related doming and faulting is assumed to have influenced both the pre-glacial and later glacial erosion of the Norvarg Dome during the Cenozoic. Overall, the relationship between salt diapirism, erosion and glacial influence is found to be complex. The structural elements within the study area have experienced different pre-Cenozoic evolutions and have been exposed to varying degrees of erosion and also phases of grounded glaciers. The halokinetic history of the structural elements is also different, causing the salt structures within the study area to have different responses to the late Cenozoic uplift, erosion and glaciation of the shelf. Master Thesis Barents Sea Loppa Nordkapp Nordkapp Basin Norvarg University of Tromsø: Munin Open Research Archive Barents Sea Dome The ENVELOPE(166.000,166.000,-85.367,-85.367) Loppa ENVELOPE(22.351,22.351,70.240,70.240) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 GEO-3900 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 GEO-3900 Martinsen, Birgitta Saue Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 GEO-3900 |
description |
The late Cenozoic evolution of the southwestern Barents Sea shelf includes periods of uplift, erosion and glaciations. This part of the stratigraphy has been studied using 2D and 3D seismic data, with emphasis on the interplay between uplift, erosion and glaciations and salt movement. The study area comprises the Svalis, Samson and Norvarg domes and the Nordkapp Basin, where halokinesis has been a major influence on the tectonostratigraphic evolution. The study includes systemization and categorization of the timing of salt activity relative to the erosion of the shelf, in the Nordkapp Basin, and on the Svalis, Samson and Norvarg domes. Very late to almost recent salt movement has occurred within some of the diapirs in the Nordkapp Basin and the Svalis Dome, evidenced by uplift of the Upper Regional Unconformity (URU) surface and the seafloor above the salt. Furthermore, the study reveals significant local variations in salt movement of the diapirs in the Nordkapp Basin, with a trend of more late salt movement towards the northeast. This is possibly attributed to a larger original salt thickness in this part of the basin compared to in the southwest. A mini-basin filled with glacigenic sediments is found adjacent to the Svalis Dome, and this is assumed to be a result of a combination of deeper glacial erosion of less resistant strata on the Loppa High, and less exposure to erosion due to the continuous salt rise and elevation of the adjacent dome. The Norvarg and Samson domes are not found to be influenced by late Cenozoic salt movement, which is attributed to factors such as original salt thickness, overburden strength and early Cenozoic erosion. Spatial variations in lithology due to salt-related doming and faulting is assumed to have influenced both the pre-glacial and later glacial erosion of the Norvarg Dome during the Cenozoic. Overall, the relationship between salt diapirism, erosion and glacial influence is found to be complex. The structural elements within the study area have experienced different pre-Cenozoic evolutions and have been exposed to varying degrees of erosion and also phases of grounded glaciers. The halokinetic history of the structural elements is also different, causing the salt structures within the study area to have different responses to the late Cenozoic uplift, erosion and glaciation of the shelf. |
format |
Master Thesis |
author |
Martinsen, Birgitta Saue |
author_facet |
Martinsen, Birgitta Saue |
author_sort |
Martinsen, Birgitta Saue |
title |
Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
title_short |
Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
title_full |
Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
title_fullStr |
Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
title_full_unstemmed |
Late Cenozoic erosion in the SW Barents Sea, and its influence on salt movement |
title_sort |
late cenozoic erosion in the sw barents sea, and its influence on salt movement |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/18314 |
long_lat |
ENVELOPE(166.000,166.000,-85.367,-85.367) ENVELOPE(22.351,22.351,70.240,70.240) |
geographic |
Barents Sea Dome The Loppa |
geographic_facet |
Barents Sea Dome The Loppa |
genre |
Barents Sea Loppa Nordkapp Nordkapp Basin Norvarg |
genre_facet |
Barents Sea Loppa Nordkapp Nordkapp Basin Norvarg |
op_relation |
https://hdl.handle.net/10037/18314 |
op_rights |
openAccess Copyright 2019 The Author(s) |
_version_ |
1766370376207564800 |