Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean
The narrow Morris Jesup Spur and an adjacent broader western rise extend 220 km into the Eurasia Basin from the shelf edge north of Greenland. We have used a hovercraft platform drifting with the sea to collect the first seismic reflection transect across an area postulated to be a former triple jun...
Published in: | Norwegian Journal of Geology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Geological Society of Norway
2021
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Online Access: | https://hdl.handle.net/11250/2989645 https://doi.org/10.17850/njg101-1-4 |
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ftunivbergen:oai:bora.uib.no:11250/2989645 2023-05-15T13:22:45+02:00 Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean Kristoffersen, Yngve Hall, John K. Nilsen, Espen Harris 2021 application/pdf https://hdl.handle.net/11250/2989645 https://doi.org/10.17850/njg101-1-4 eng eng Geological Society of Norway urn:issn:2387-5844 https://hdl.handle.net/11250/2989645 https://dx.doi.org/10.17850/njg101-1-4 cristin:1996840 Norwegian Journal of Geology. 2021, 101 (1), . Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright the authors 202104 Norwegian Journal of Geology 101 Journal article Peer reviewed 2021 ftunivbergen https://doi.org/10.17850/njg101-1-4 2023-03-14T17:42:44Z The narrow Morris Jesup Spur and an adjacent broader western rise extend 220 km into the Eurasia Basin from the shelf edge north of Greenland. We have used a hovercraft platform drifting with the sea to collect the first seismic reflection transect across an area postulated to be a former triple junction between the Greenland, Eurasian and North American plates. The narrow, flat-topped Morris Jesup Spur is a succession of west-dipping (? 3°) sediments overlying a basal volcanic unit truncated at the top by an unconformity. The Morris Jesup Rise is formed by intensely deformed sediments and volcanic rocks with a deformation front to the northwest. The basin between theMorris Jesup Rise and the Lomonosov Ridge has a sediment thickness of >3 km with a large submarine channel/levee complex in the upper part and repeated volcanic units present in the deeper stratigraphy below 1.0 sec. sub-bottom. Volcanism on the Morris Jesup Spur is considered to be Late Cretaceous–early Cenozoic in age, and continued into the late Miocene on the Morris Jesup Rise and possibly into early Oligocene in the SW Amundsen Basin. The western slope of the Morris Jesup Spur represented the continental slope north of Svalbard in the Late Cretaceous. A block which included the Morris Jesup Spur and Yermak Plateau rifted off during the initial opening of the Eurasia Basin and moved as part of Greenland until about Chron 22. The architecture of the Morris Jesup Rise is a result of plate convergence possibly including a former extensional plate boundary segment which connected the Gakkel spreading centre to the Hornsund Fault between Chron 22 and Chron 13. The Morris Jesup Rise may be a northern tectonic outlier of a more extensive Eurekan tectonic domain hidden below the Lincoln Sea continental shelf. The Morris Jesup Spur remained subaerial until latest Miocene and submergence of the spur most likely intensified the East Greenland Current. publishedVersion Article in Journal/Newspaper amundsen basin Arctic Arctic Ocean East Greenland east greenland current Greenland Hornsund Lincoln Sea Lomonosov Ridge Svalbard Yermak plateau University of Bergen: Bergen Open Research Archive (BORA-UiB) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Eurasia Basin ENVELOPE(80.000,80.000,87.000,87.000) Greenland Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Morris Jesup Rise ENVELOPE(-20.000,-20.000,83.750,83.750) Morris Jesup Spur ENVELOPE(-19.500,-19.500,84.750,84.750) Svalbard Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) Norwegian Journal of Geology |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The narrow Morris Jesup Spur and an adjacent broader western rise extend 220 km into the Eurasia Basin from the shelf edge north of Greenland. We have used a hovercraft platform drifting with the sea to collect the first seismic reflection transect across an area postulated to be a former triple junction between the Greenland, Eurasian and North American plates. The narrow, flat-topped Morris Jesup Spur is a succession of west-dipping (? 3°) sediments overlying a basal volcanic unit truncated at the top by an unconformity. The Morris Jesup Rise is formed by intensely deformed sediments and volcanic rocks with a deformation front to the northwest. The basin between theMorris Jesup Rise and the Lomonosov Ridge has a sediment thickness of >3 km with a large submarine channel/levee complex in the upper part and repeated volcanic units present in the deeper stratigraphy below 1.0 sec. sub-bottom. Volcanism on the Morris Jesup Spur is considered to be Late Cretaceous–early Cenozoic in age, and continued into the late Miocene on the Morris Jesup Rise and possibly into early Oligocene in the SW Amundsen Basin. The western slope of the Morris Jesup Spur represented the continental slope north of Svalbard in the Late Cretaceous. A block which included the Morris Jesup Spur and Yermak Plateau rifted off during the initial opening of the Eurasia Basin and moved as part of Greenland until about Chron 22. The architecture of the Morris Jesup Rise is a result of plate convergence possibly including a former extensional plate boundary segment which connected the Gakkel spreading centre to the Hornsund Fault between Chron 22 and Chron 13. The Morris Jesup Rise may be a northern tectonic outlier of a more extensive Eurekan tectonic domain hidden below the Lincoln Sea continental shelf. The Morris Jesup Spur remained subaerial until latest Miocene and submergence of the spur most likely intensified the East Greenland Current. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kristoffersen, Yngve Hall, John K. Nilsen, Espen Harris |
spellingShingle |
Kristoffersen, Yngve Hall, John K. Nilsen, Espen Harris Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
author_facet |
Kristoffersen, Yngve Hall, John K. Nilsen, Espen Harris |
author_sort |
Kristoffersen, Yngve |
title |
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
title_short |
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
title_full |
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
title_fullStr |
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
title_full_unstemmed |
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean |
title_sort |
morris jesup spur and rise north of greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a late cretaceous/early cenozoic triple junction in the arctic ocean |
publisher |
Geological Society of Norway |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2989645 https://doi.org/10.17850/njg101-1-4 |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) ENVELOPE(80.000,80.000,87.000,87.000) ENVELOPE(15.865,15.865,76.979,76.979) ENVELOPE(-20.000,-20.000,83.750,83.750) ENVELOPE(-19.500,-19.500,84.750,84.750) ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Amundsen Basin Arctic Arctic Ocean Eurasia Basin Greenland Hornsund Morris Jesup Rise Morris Jesup Spur Svalbard Yermak Plateau |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean Eurasia Basin Greenland Hornsund Morris Jesup Rise Morris Jesup Spur Svalbard Yermak Plateau |
genre |
amundsen basin Arctic Arctic Ocean East Greenland east greenland current Greenland Hornsund Lincoln Sea Lomonosov Ridge Svalbard Yermak plateau |
genre_facet |
amundsen basin Arctic Arctic Ocean East Greenland east greenland current Greenland Hornsund Lincoln Sea Lomonosov Ridge Svalbard Yermak plateau |
op_source |
202104 Norwegian Journal of Geology 101 |
op_relation |
urn:issn:2387-5844 https://hdl.handle.net/11250/2989645 https://dx.doi.org/10.17850/njg101-1-4 cristin:1996840 Norwegian Journal of Geology. 2021, 101 (1), . |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright the authors |
op_doi |
https://doi.org/10.17850/njg101-1-4 |
container_title |
Norwegian Journal of Geology |
_version_ |
1766366794349543424 |