A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing
Highlights • Multiple submarine landslide scars occur on the Beaufort Continental Slope. • Scars are left by large-scale Late Holocene retrogressive slope failures. • Scars coalesce downslope to form basin wide feature at ≥1200 m depths. • Failure planes are at 30–75 depths within rapidly deposited...
Published in: | Marine Geology |
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Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/52074/ https://oceanrep.geomar.de/id/eprint/52074/7/1-s2.0-S0025322721000359-main.pdf https://oceanrep.geomar.de/id/eprint/52074/8/1-s2.0-S0025322721000359-mmc1.xlsx https://doi.org/10.1016/j.margeo.2021.106453 |
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ftoceanrep:oai:oceanrep.geomar.de:52074 2024-02-11T09:59:43+01:00 A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing Paull, C.K. Dallimore, S.R. Caress, D.W. Gwiazda, R. Lundsten, E. Anderson, K. Melling, H. Jin, Y.K. Duchesne, M.J. Kang, S.-G. Kim, S. Riedel, Michael King, E.L. Lorenson, T. 2021-05 text other https://oceanrep.geomar.de/id/eprint/52074/ https://oceanrep.geomar.de/id/eprint/52074/7/1-s2.0-S0025322721000359-main.pdf https://oceanrep.geomar.de/id/eprint/52074/8/1-s2.0-S0025322721000359-mmc1.xlsx https://doi.org/10.1016/j.margeo.2021.106453 en eng Elsevier https://oceanrep.geomar.de/id/eprint/52074/7/1-s2.0-S0025322721000359-main.pdf https://oceanrep.geomar.de/id/eprint/52074/8/1-s2.0-S0025322721000359-mmc1.xlsx Paull, C. K., Dallimore, S. R., Caress, D. W., Gwiazda, R., Lundsten, E., Anderson, K., Melling, H., Jin, Y. K., Duchesne, M. J., Kang, S. G., Kim, S., Riedel, M. , King, E. L. and Lorenson, T. (2021) A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing. Open Access Marine Geology, 435 . Art.Nr. 106453. DOI 10.1016/j.margeo.2021.106453 <https://doi.org/10.1016/j.margeo.2021.106453>. doi:10.1016/j.margeo.2021.106453 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.margeo.2021.106453 2024-01-15T00:23:13Z Highlights • Multiple submarine landslide scars occur on the Beaufort Continental Slope. • Scars are left by large-scale Late Holocene retrogressive slope failures. • Scars coalesce downslope to form basin wide feature at ≥1200 m depths. • Failure planes are at 30–75 depths within rapidly deposited glaciomarine sediments. • Widespread brackish water infusion into failure zone preconditions slope for failure. Exploration of the continental slope of the Canadian Beaufort Sea has revealed a remarkable coalescence of slide scars with headwalls between 130 and 1100 m water depth (mwd). With increased depth, the scars widen and merge into one gigantic regional slide scar that is more than 100 km wide below ~1100 mwd. To understand the development of these features, five sites were investigated with an Autonomous Underwater Vehicle, which provided 1-m bathymetric grids and Chirp profiles, and surveyed with a Remotely Operated Vehicle. The morphologies are consistent with retrograde failures that occurred on failure planes located between 30 and 75 m below the modern seafloor. At issue is whether the continental slope in this area is preconditioned for failure. While rapid sedimentation during glacial periods, and the presence of shallow gas cannot be ruled out, given the geological environment, it is unclear that they are primary preconditioning factors. Evidence of widespread flushing of the slope with brackish waters, and observed flows of brackish water within slide scars, suggest fluid venting and overpressure may play a role in the development of the extensive slope failures seen along this margin. The impact of pore water salinity changes at the depth of the failure plane on slope stability has not been considered in marine settings previously. Article in Journal/Newspaper Arctic Arctic Beaufort Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Marine Geology 435 106453 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Highlights • Multiple submarine landslide scars occur on the Beaufort Continental Slope. • Scars are left by large-scale Late Holocene retrogressive slope failures. • Scars coalesce downslope to form basin wide feature at ≥1200 m depths. • Failure planes are at 30–75 depths within rapidly deposited glaciomarine sediments. • Widespread brackish water infusion into failure zone preconditions slope for failure. Exploration of the continental slope of the Canadian Beaufort Sea has revealed a remarkable coalescence of slide scars with headwalls between 130 and 1100 m water depth (mwd). With increased depth, the scars widen and merge into one gigantic regional slide scar that is more than 100 km wide below ~1100 mwd. To understand the development of these features, five sites were investigated with an Autonomous Underwater Vehicle, which provided 1-m bathymetric grids and Chirp profiles, and surveyed with a Remotely Operated Vehicle. The morphologies are consistent with retrograde failures that occurred on failure planes located between 30 and 75 m below the modern seafloor. At issue is whether the continental slope in this area is preconditioned for failure. While rapid sedimentation during glacial periods, and the presence of shallow gas cannot be ruled out, given the geological environment, it is unclear that they are primary preconditioning factors. Evidence of widespread flushing of the slope with brackish waters, and observed flows of brackish water within slide scars, suggest fluid venting and overpressure may play a role in the development of the extensive slope failures seen along this margin. The impact of pore water salinity changes at the depth of the failure plane on slope stability has not been considered in marine settings previously. |
format |
Article in Journal/Newspaper |
author |
Paull, C.K. Dallimore, S.R. Caress, D.W. Gwiazda, R. Lundsten, E. Anderson, K. Melling, H. Jin, Y.K. Duchesne, M.J. Kang, S.-G. Kim, S. Riedel, Michael King, E.L. Lorenson, T. |
spellingShingle |
Paull, C.K. Dallimore, S.R. Caress, D.W. Gwiazda, R. Lundsten, E. Anderson, K. Melling, H. Jin, Y.K. Duchesne, M.J. Kang, S.-G. Kim, S. Riedel, Michael King, E.L. Lorenson, T. A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
author_facet |
Paull, C.K. Dallimore, S.R. Caress, D.W. Gwiazda, R. Lundsten, E. Anderson, K. Melling, H. Jin, Y.K. Duchesne, M.J. Kang, S.-G. Kim, S. Riedel, Michael King, E.L. Lorenson, T. |
author_sort |
Paull, C.K. |
title |
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
title_short |
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
title_full |
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
title_fullStr |
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
title_full_unstemmed |
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing |
title_sort |
100-km wide slump along the upper slope of the canadian arctic was likely preconditioned for failure by brackish pore water flushing |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/52074/ https://oceanrep.geomar.de/id/eprint/52074/7/1-s2.0-S0025322721000359-main.pdf https://oceanrep.geomar.de/id/eprint/52074/8/1-s2.0-S0025322721000359-mmc1.xlsx https://doi.org/10.1016/j.margeo.2021.106453 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Beaufort Sea |
genre_facet |
Arctic Arctic Beaufort Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/52074/7/1-s2.0-S0025322721000359-main.pdf https://oceanrep.geomar.de/id/eprint/52074/8/1-s2.0-S0025322721000359-mmc1.xlsx Paull, C. K., Dallimore, S. R., Caress, D. W., Gwiazda, R., Lundsten, E., Anderson, K., Melling, H., Jin, Y. K., Duchesne, M. J., Kang, S. G., Kim, S., Riedel, M. , King, E. L. and Lorenson, T. (2021) A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing. Open Access Marine Geology, 435 . Art.Nr. 106453. DOI 10.1016/j.margeo.2021.106453 <https://doi.org/10.1016/j.margeo.2021.106453>. doi:10.1016/j.margeo.2021.106453 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2021.106453 |
container_title |
Marine Geology |
container_volume |
435 |
container_start_page |
106453 |
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1790595498418110464 |