Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea
Hill-hole pairs are subglacial landforms consisting of thrust-block hills and associated source depressions. Formed by evacuation of material where ice sheets have been locally frozen to the substrate, they give insights into paleo-ice-sheet dynamics. The aim of this study was to document the relati...
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Elsevier
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Online Access: | https://hdl.handle.net/10037/27570 https://doi.org/10.1016/j.geomorph.2022.108502 |
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ftunivtroemsoe:oai:munin.uit.no:10037/27570 2023-05-15T15:38:39+02:00 Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea Bellwald, Benjamin Stokke, Henrik Henriksen Winsborrow, Monica Planke, Sverre Sættem, Joar Lebedeva-Ivanova, Nina Hafeez, Amer Kurjanski, Bartosz Myklebust, Reidun Alice Polteau, Stephane 2022-11-11 https://hdl.handle.net/10037/27570 https://doi.org/10.1016/j.geomorph.2022.108502 eng eng Elsevier Geomorphology Norges forskningsråd: 223259 Norges forskningsråd: 331644 Norges forskningsråd: 228107 Bellwald B, Stokke HH, Winsborrow M, Planke S, Sættem J, Lebedeva-Ivanova N.N., Hafeez A, Kurjanski B, Myklebust RA, Polteau S. Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea. Geomorphology. 2022;420 FRIDAID 2075705 doi:10.1016/j.geomorph.2022.108502 0169-555X 1872-695X https://hdl.handle.net/10037/27570 openAccess Copyright 2022 The Author(s) Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2022 ftunivtroemsoe https://doi.org/10.1016/j.geomorph.2022.108502 2022-12-01T00:02:25Z Hill-hole pairs are subglacial landforms consisting of thrust-block hills and associated source depressions. Formed by evacuation of material where ice sheets have been locally frozen to the substrate, they give insights into paleo-ice-sheet dynamics. The aim of this study was to document the relationships between ancient hill-hole pairs identified on a buried glacial unconformity with the structure of the underlying sedimentary deposits, and then to determine if the basin geology and glacial fluid migration pathways promoted local subglacial freeze-on during the hill-hole pair formation. The study is based on seismic geomorphological interpretation of four high-resolution 3D seismic cubes covering an area of 800 km2 in the SW Barents Sea, and fluid seepage data from 37 gravity cores. The seismic datasets allowed the identification of 55 hill-hole pairs along the buried unconformity. The hills are characterized by chaotic to homogenous seismic facies forming up to 19 m high mounds, each covering areas of 2000–644,000 m2. The holes form depressions between 1 and 44 m deep and 2000–704,000 m2 in areal extent, which cut into preglacial Mesozoic bedrock and later infilled by glacial till. The holes are often found above fault terminations. High-amplitude reflections identified along the faults and in the strata below the holes are interpreted as shallow gas migrating upward towards the glacial unconformity. Geochemical data of the seabed sediment cores further indicates an association between hill-hole pair occurrence and present-day thermogenic hydrocarbon seepage. The hill-hole pairs geometries were also used to identify five paleo-ice-flow directions along the glacial unconformity. These ice flows exhibit polythermal regimes, and four of them are parallel to ice-stream flow sets interpreted from glacial lineations. The integrated interpretation supports localized fault-related basal freezing of the Barents Sea Ice Sheet which resulted in the formation of hill-hole pairs when the ice sheet moved. In this context, ... Article in Journal/Newspaper Barents Sea Ice Sheet Sea ice University of Tromsø: Munin Open Research Archive Barents Sea Geomorphology 420 108502 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
Hill-hole pairs are subglacial landforms consisting of thrust-block hills and associated source depressions. Formed by evacuation of material where ice sheets have been locally frozen to the substrate, they give insights into paleo-ice-sheet dynamics. The aim of this study was to document the relationships between ancient hill-hole pairs identified on a buried glacial unconformity with the structure of the underlying sedimentary deposits, and then to determine if the basin geology and glacial fluid migration pathways promoted local subglacial freeze-on during the hill-hole pair formation. The study is based on seismic geomorphological interpretation of four high-resolution 3D seismic cubes covering an area of 800 km2 in the SW Barents Sea, and fluid seepage data from 37 gravity cores. The seismic datasets allowed the identification of 55 hill-hole pairs along the buried unconformity. The hills are characterized by chaotic to homogenous seismic facies forming up to 19 m high mounds, each covering areas of 2000–644,000 m2. The holes form depressions between 1 and 44 m deep and 2000–704,000 m2 in areal extent, which cut into preglacial Mesozoic bedrock and later infilled by glacial till. The holes are often found above fault terminations. High-amplitude reflections identified along the faults and in the strata below the holes are interpreted as shallow gas migrating upward towards the glacial unconformity. Geochemical data of the seabed sediment cores further indicates an association between hill-hole pair occurrence and present-day thermogenic hydrocarbon seepage. The hill-hole pairs geometries were also used to identify five paleo-ice-flow directions along the glacial unconformity. These ice flows exhibit polythermal regimes, and four of them are parallel to ice-stream flow sets interpreted from glacial lineations. The integrated interpretation supports localized fault-related basal freezing of the Barents Sea Ice Sheet which resulted in the formation of hill-hole pairs when the ice sheet moved. In this context, ... |
format |
Article in Journal/Newspaper |
author |
Bellwald, Benjamin Stokke, Henrik Henriksen Winsborrow, Monica Planke, Sverre Sættem, Joar Lebedeva-Ivanova, Nina Hafeez, Amer Kurjanski, Bartosz Myklebust, Reidun Alice Polteau, Stephane |
spellingShingle |
Bellwald, Benjamin Stokke, Henrik Henriksen Winsborrow, Monica Planke, Sverre Sættem, Joar Lebedeva-Ivanova, Nina Hafeez, Amer Kurjanski, Bartosz Myklebust, Reidun Alice Polteau, Stephane Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
author_facet |
Bellwald, Benjamin Stokke, Henrik Henriksen Winsborrow, Monica Planke, Sverre Sættem, Joar Lebedeva-Ivanova, Nina Hafeez, Amer Kurjanski, Bartosz Myklebust, Reidun Alice Polteau, Stephane |
author_sort |
Bellwald, Benjamin |
title |
Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
title_short |
Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
title_full |
Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
title_fullStr |
Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
title_full_unstemmed |
Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea |
title_sort |
structural and fluid-migration control on hill-hole pair formation: evidence from high-resolution 3d seismic data from the sw barents sea |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://hdl.handle.net/10037/27570 https://doi.org/10.1016/j.geomorph.2022.108502 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Ice Sheet Sea ice |
genre_facet |
Barents Sea Ice Sheet Sea ice |
op_relation |
Geomorphology Norges forskningsråd: 223259 Norges forskningsråd: 331644 Norges forskningsråd: 228107 Bellwald B, Stokke HH, Winsborrow M, Planke S, Sættem J, Lebedeva-Ivanova N.N., Hafeez A, Kurjanski B, Myklebust RA, Polteau S. Structural and fluid-migration control on hill-hole pair formation: Evidence from high-resolution 3D seismic data from the SW Barents Sea. Geomorphology. 2022;420 FRIDAID 2075705 doi:10.1016/j.geomorph.2022.108502 0169-555X 1872-695X https://hdl.handle.net/10037/27570 |
op_rights |
openAccess Copyright 2022 The Author(s) |
op_doi |
https://doi.org/10.1016/j.geomorph.2022.108502 |
container_title |
Geomorphology |
container_volume |
420 |
container_start_page |
108502 |
_version_ |
1766369864142815232 |