Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences
This study has investigated salt movements in the Nordkapp Basin, on the Loppa High (Svalis Dome) and on the Bjarmeland Platform (Samson- and Norvarg domes). The aim is to discuss how differences in salt growth potentially relates to the structural evolution of - and differences between - these thre...
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UiT Norges arktiske universitet
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ftunivtroemsoe:oai:munin.uit.no:10037/18306 2023-05-15T15:38:53+02:00 Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences Thorsen, Truls 2019-05-15 https://hdl.handle.net/10037/18306 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/18306 openAccess Copyright 2019 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 Nordkapp Basin Nordkappbassenget Svalis Dome Svalisdomen Samson Dome Samsondomen Norvarg Dome Norvargdomen Salt tectonics Salttektonikk GEO-3900 Master thesis Mastergradsoppgave 2019 ftunivtroemsoe 2021-06-25T17:57:25Z This study has investigated salt movements in the Nordkapp Basin, on the Loppa High (Svalis Dome) and on the Bjarmeland Platform (Samson- and Norvarg domes). The aim is to discuss how differences in salt growth potentially relates to the structural evolution of - and differences between - these three provinces. Evaluation of seismic 2D- and 3D data together with well correlation, allowed a regional stratigraphic framework to be established for the Permian-Quaternary succession. Four stratigraphic units were defined: Lower Triassic, Lower to Middle Triassic, Middle Triassic-Jurassic and Cretaceous-recent. Thickness variations and reflection configurations within these units, together with salt morphology, documented the timing of salt growth. In the Nordkapp Basin, several phases of salt growth occurred throughout the Triassic, a period usually referred to as tectonically quiet in the southwestern Barents Sea. Extensional forces locally lead to subsidence and faulting/steepening of the basin margins. A regional extensional event lead to renewed salt growth during the Cretaceous, before Cenozoic regional compression squeezed the diapirs, resulting in a final growth phase. At the Svalis Dome, a salt pillow grew during the Early to Middle Triassic-Jurassic. Later uplift and erosion of the dome resulted in renewed growth and diapirism. Little or no salt movements are observed on the Samson- and Norvarg domes during the Mesozoic, but Cenozoic compression appears to have mobilized the salt. The main differences in salt growth between the three provinces seem to relate to the different structural settings; in the Nordkapp Basin, diapirs grew already in the Triassic possibly due to extensional forces in and adjacent to the basin. On the Svalis Dome, the salt growth seems to relate to a large degree of uplift of the Loppa High. At the Bjarmeland Platform, a late initial growth stage reflects a tectonically stable environment until Cenozoic regional compression mobilized the salt. Master Thesis Barents Sea Loppa Nordkapp Nordkapp Basin Nordkappbassenget 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::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 Nordkapp Basin Nordkappbassenget Svalis Dome Svalisdomen Samson Dome Samsondomen Norvarg Dome Norvargdomen Salt tectonics Salttektonikk GEO-3900 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 Nordkapp Basin Nordkappbassenget Svalis Dome Svalisdomen Samson Dome Samsondomen Norvarg Dome Norvargdomen Salt tectonics Salttektonikk GEO-3900 Thorsen, Truls Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 Nordkapp Basin Nordkappbassenget Svalis Dome Svalisdomen Samson Dome Samsondomen Norvarg Dome Norvargdomen Salt tectonics Salttektonikk GEO-3900 |
description |
This study has investigated salt movements in the Nordkapp Basin, on the Loppa High (Svalis Dome) and on the Bjarmeland Platform (Samson- and Norvarg domes). The aim is to discuss how differences in salt growth potentially relates to the structural evolution of - and differences between - these three provinces. Evaluation of seismic 2D- and 3D data together with well correlation, allowed a regional stratigraphic framework to be established for the Permian-Quaternary succession. Four stratigraphic units were defined: Lower Triassic, Lower to Middle Triassic, Middle Triassic-Jurassic and Cretaceous-recent. Thickness variations and reflection configurations within these units, together with salt morphology, documented the timing of salt growth. In the Nordkapp Basin, several phases of salt growth occurred throughout the Triassic, a period usually referred to as tectonically quiet in the southwestern Barents Sea. Extensional forces locally lead to subsidence and faulting/steepening of the basin margins. A regional extensional event lead to renewed salt growth during the Cretaceous, before Cenozoic regional compression squeezed the diapirs, resulting in a final growth phase. At the Svalis Dome, a salt pillow grew during the Early to Middle Triassic-Jurassic. Later uplift and erosion of the dome resulted in renewed growth and diapirism. Little or no salt movements are observed on the Samson- and Norvarg domes during the Mesozoic, but Cenozoic compression appears to have mobilized the salt. The main differences in salt growth between the three provinces seem to relate to the different structural settings; in the Nordkapp Basin, diapirs grew already in the Triassic possibly due to extensional forces in and adjacent to the basin. On the Svalis Dome, the salt growth seems to relate to a large degree of uplift of the Loppa High. At the Bjarmeland Platform, a late initial growth stage reflects a tectonically stable environment until Cenozoic regional compression mobilized the salt. |
format |
Master Thesis |
author |
Thorsen, Truls |
author_facet |
Thorsen, Truls |
author_sort |
Thorsen, Truls |
title |
Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
title_short |
Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
title_full |
Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
title_fullStr |
Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
title_full_unstemmed |
Salt movements in three provinces in the southwestern Barents Sea: development, timing, and implications of regional structural differences |
title_sort |
salt movements in three provinces in the southwestern barents sea: development, timing, and implications of regional structural differences |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/18306 |
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 Nordkappbassenget Norvarg |
genre_facet |
Barents Sea Loppa Nordkapp Nordkapp Basin Nordkappbassenget Norvarg |
op_relation |
https://hdl.handle.net/10037/18306 |
op_rights |
openAccess Copyright 2019 The Author(s) |
_version_ |
1766370295792271360 |