Cretaceous ocean formation in the High Arctic
Understanding the evolution of ocean basins is critical for studies in global plate tectonics, mantle dynamics, and sea-level through time, and relies on identifiable tectonic plate boundaries. The evolution of the 2.5 million km 2 Amerasia Basin in the Arctic Ocean remains largely unsettled due to...
Published in: | Earth and Planetary Science Letters |
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2020
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Online Access: | https://orbit.dtu.dk/en/publications/c3c5c4da-a924-4af5-bc60-59c3af586979 https://doi.org/10.1016/j.epsl.2020.116552 |
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ftdtupubl:oai:pure.atira.dk:publications/c3c5c4da-a924-4af5-bc60-59c3af586979 2024-09-15T17:50:34+00:00 Cretaceous ocean formation in the High Arctic Døssing, Arne Gaina, Carmen Jackson, H. Ruth Andersen, Ole Baltazar 2020 https://orbit.dtu.dk/en/publications/c3c5c4da-a924-4af5-bc60-59c3af586979 https://doi.org/10.1016/j.epsl.2020.116552 eng eng https://orbit.dtu.dk/en/publications/c3c5c4da-a924-4af5-bc60-59c3af586979 info:eu-repo/semantics/closedAccess Døssing , A , Gaina , C , Jackson , H R & Andersen , O B 2020 , ' Cretaceous ocean formation in the High Arctic ' , Earth and Planetary Science Letters , vol. 551 , 116552 . https://doi.org/10.1016/j.epsl.2020.116552 Amerasia Basin Canada Basin Cretaceous Gravity inversion Plate reconstructions Sea-floor spreading /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2020 ftdtupubl https://doi.org/10.1016/j.epsl.2020.116552 2024-07-22T23:50:06Z Understanding the evolution of ocean basins is critical for studies in global plate tectonics, mantle dynamics, and sea-level through time, and relies on identifiable tectonic plate boundaries. The evolution of the 2.5 million km 2 Amerasia Basin in the Arctic Ocean remains largely unsettled due to widespread overprint by the Cretaceous High-Arctic Large Igneous Province. Traces of an extinct, but deeply buried, spreading centre (herein South Amerasia Ridge, SAR) has been shown to exist in the southern part of the Amerasia Basin, in the Canada Basin. However, structural details of the SAR and, hence, the kinematic evolution of the Canada Basin, are yet to be unraveled. Based on 3D gravity inversion and the vertical gravity gradient of the latest generation of satellite gravity models, we document new structures within the Canada Basin spreading system. Our results are supported by analysis of aeromagnetic and recent marine geophysical data. Evidence is shown of consistent oblique segmentation of the SAR spreading centre in a right stepping en echelon pattern. The spreading segments are offset by northeast-trending non-transforms that are traceable throughout the oceanic crustal domain and parallel to pre-oceanic strike-slip faults in the older part of the Canada Basin. We interpret the SAR to have formed by highly oblique spreading in a northeast-southwest direction. We compare the predicted SAR basement topography with the global ridge systems and produce a detailed magnetic modelling also constrained by the basement topography. The results indicate that the SAR crust formed by a slow-to-intermediate spreading regime and that sea-floor spreading terminated during a reverse polarity chron, most likely in the Early Cretaceous. Our novel plate reconstruction model, adopting a highly oblique spreading in Canada Basin, requires a translational motion of the Alaska/Chukotka tectonic block, replacing the decades-old rotational model of the Cretaceous High Arctic. Article in Journal/Newspaper Arctic Arctic Ocean canada basin Chukotka Alaska Technical University of Denmark: DTU Orbit Earth and Planetary Science Letters 551 116552 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Amerasia Basin Canada Basin Cretaceous Gravity inversion Plate reconstructions Sea-floor spreading /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Amerasia Basin Canada Basin Cretaceous Gravity inversion Plate reconstructions Sea-floor spreading /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Døssing, Arne Gaina, Carmen Jackson, H. Ruth Andersen, Ole Baltazar Cretaceous ocean formation in the High Arctic |
topic_facet |
Amerasia Basin Canada Basin Cretaceous Gravity inversion Plate reconstructions Sea-floor spreading /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Understanding the evolution of ocean basins is critical for studies in global plate tectonics, mantle dynamics, and sea-level through time, and relies on identifiable tectonic plate boundaries. The evolution of the 2.5 million km 2 Amerasia Basin in the Arctic Ocean remains largely unsettled due to widespread overprint by the Cretaceous High-Arctic Large Igneous Province. Traces of an extinct, but deeply buried, spreading centre (herein South Amerasia Ridge, SAR) has been shown to exist in the southern part of the Amerasia Basin, in the Canada Basin. However, structural details of the SAR and, hence, the kinematic evolution of the Canada Basin, are yet to be unraveled. Based on 3D gravity inversion and the vertical gravity gradient of the latest generation of satellite gravity models, we document new structures within the Canada Basin spreading system. Our results are supported by analysis of aeromagnetic and recent marine geophysical data. Evidence is shown of consistent oblique segmentation of the SAR spreading centre in a right stepping en echelon pattern. The spreading segments are offset by northeast-trending non-transforms that are traceable throughout the oceanic crustal domain and parallel to pre-oceanic strike-slip faults in the older part of the Canada Basin. We interpret the SAR to have formed by highly oblique spreading in a northeast-southwest direction. We compare the predicted SAR basement topography with the global ridge systems and produce a detailed magnetic modelling also constrained by the basement topography. The results indicate that the SAR crust formed by a slow-to-intermediate spreading regime and that sea-floor spreading terminated during a reverse polarity chron, most likely in the Early Cretaceous. Our novel plate reconstruction model, adopting a highly oblique spreading in Canada Basin, requires a translational motion of the Alaska/Chukotka tectonic block, replacing the decades-old rotational model of the Cretaceous High Arctic. |
format |
Article in Journal/Newspaper |
author |
Døssing, Arne Gaina, Carmen Jackson, H. Ruth Andersen, Ole Baltazar |
author_facet |
Døssing, Arne Gaina, Carmen Jackson, H. Ruth Andersen, Ole Baltazar |
author_sort |
Døssing, Arne |
title |
Cretaceous ocean formation in the High Arctic |
title_short |
Cretaceous ocean formation in the High Arctic |
title_full |
Cretaceous ocean formation in the High Arctic |
title_fullStr |
Cretaceous ocean formation in the High Arctic |
title_full_unstemmed |
Cretaceous ocean formation in the High Arctic |
title_sort |
cretaceous ocean formation in the high arctic |
publishDate |
2020 |
url |
https://orbit.dtu.dk/en/publications/c3c5c4da-a924-4af5-bc60-59c3af586979 https://doi.org/10.1016/j.epsl.2020.116552 |
genre |
Arctic Arctic Ocean canada basin Chukotka Alaska |
genre_facet |
Arctic Arctic Ocean canada basin Chukotka Alaska |
op_source |
Døssing , A , Gaina , C , Jackson , H R & Andersen , O B 2020 , ' Cretaceous ocean formation in the High Arctic ' , Earth and Planetary Science Letters , vol. 551 , 116552 . https://doi.org/10.1016/j.epsl.2020.116552 |
op_relation |
https://orbit.dtu.dk/en/publications/c3c5c4da-a924-4af5-bc60-59c3af586979 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116552 |
container_title |
Earth and Planetary Science Letters |
container_volume |
551 |
container_start_page |
116552 |
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1810292369657954304 |