Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea
Large seabed depressions in the Ingøydjupet Trough have previously been interpreted to be formed by sub-glacial melt-water. However, fluid migration and gas expulsion occur over large parts of the Barents Sea, which are frequently associated with seabed depressions. This thesis studies how the seabe...
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UiT The Arctic University of Norway
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ftunivtroemsoe:oai:munin.uit.no:10037/9421 2023-05-15T15:38:38+02:00 Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea Prytz, Richard 2016-06-13 https://hdl.handle.net/10037/9421 eng eng UiT The Arctic University of Norway UiT Norges arktiske universitet https://hdl.handle.net/10037/9421 URN:NBN:no-uit_munin_8983 openAccess Copyright 2016 The Author(s) VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 EOM-3901 Master thesis Mastergradsoppgave 2016 ftunivtroemsoe 2021-06-25T17:54:47Z Large seabed depressions in the Ingøydjupet Trough have previously been interpreted to be formed by sub-glacial melt-water. However, fluid migration and gas expulsion occur over large parts of the Barents Sea, which are frequently associated with seabed depressions. This thesis studies how the seabed depressions are related to sub-surface canyons on the southern part of the Loppa High, SW Barents Sea. The canyons are located stratigraphically below the seabed depressions, and high-amplitude zones at the canyon crests indicate accumulation of gas. Migration of fluids seems to take place along the canyon flanks, and the canyons and their infills have been mapped out in order to infer the distribution of shallow gas and their relation to the seabed depressions. Uplift and erosion have influenced the fluid flow system several times since the formation of the canyons. The final phase was related to glacial isostatic adjustment causing the gas to expand and build up pressure before eruption and seepage of shallow gas took place. Severe erosion further caused the seismic unit S2 to the absent in the southwestern parts of the study area. The thickness of S2 appears to affect the distribution of depressions and fluid migration, as it acts as an impermeable barrier where it is present and thus prevents fluids to reach the seabed and form depressions. The large seabed depressions above the canyons occur in areas where S2 is not present, which suggests that shallow gas is indeed a major contributor to the seafloor topography. Master Thesis Barents Sea Ingøydjupet Loppa University of Tromsø: Munin Open Research Archive Barents Sea Ingøydjupet ENVELOPE(23.000,23.000,71.417,71.417) 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::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 EOM-3901 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 EOM-3901 Prytz, Richard Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 EOM-3901 |
description |
Large seabed depressions in the Ingøydjupet Trough have previously been interpreted to be formed by sub-glacial melt-water. However, fluid migration and gas expulsion occur over large parts of the Barents Sea, which are frequently associated with seabed depressions. This thesis studies how the seabed depressions are related to sub-surface canyons on the southern part of the Loppa High, SW Barents Sea. The canyons are located stratigraphically below the seabed depressions, and high-amplitude zones at the canyon crests indicate accumulation of gas. Migration of fluids seems to take place along the canyon flanks, and the canyons and their infills have been mapped out in order to infer the distribution of shallow gas and their relation to the seabed depressions. Uplift and erosion have influenced the fluid flow system several times since the formation of the canyons. The final phase was related to glacial isostatic adjustment causing the gas to expand and build up pressure before eruption and seepage of shallow gas took place. Severe erosion further caused the seismic unit S2 to the absent in the southwestern parts of the study area. The thickness of S2 appears to affect the distribution of depressions and fluid migration, as it acts as an impermeable barrier where it is present and thus prevents fluids to reach the seabed and form depressions. The large seabed depressions above the canyons occur in areas where S2 is not present, which suggests that shallow gas is indeed a major contributor to the seafloor topography. |
format |
Master Thesis |
author |
Prytz, Richard |
author_facet |
Prytz, Richard |
author_sort |
Prytz, Richard |
title |
Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
title_short |
Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
title_full |
Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
title_fullStr |
Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
title_full_unstemmed |
Seabed depressions in the Ingøydjupet Trough and their relation to buried canyons on the Loppa High, Barents Sea |
title_sort |
seabed depressions in the ingøydjupet trough and their relation to buried canyons on the loppa high, barents sea |
publisher |
UiT The Arctic University of Norway |
publishDate |
2016 |
url |
https://hdl.handle.net/10037/9421 |
long_lat |
ENVELOPE(23.000,23.000,71.417,71.417) ENVELOPE(22.351,22.351,70.240,70.240) |
geographic |
Barents Sea Ingøydjupet Loppa |
geographic_facet |
Barents Sea Ingøydjupet Loppa |
genre |
Barents Sea Ingøydjupet Loppa |
genre_facet |
Barents Sea Ingøydjupet Loppa |
op_relation |
https://hdl.handle.net/10037/9421 URN:NBN:no-uit_munin_8983 |
op_rights |
openAccess Copyright 2016 The Author(s) |
_version_ |
1766369776717791232 |