Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers

Abstract Radioisotopic dating of volcanic minerals is a powerful method for establishing absolute time constraints in sedimentary basins, which improves our understanding of the chronostratigraphy and evolution of basin processes. The relative plate motions of Greenland, North America, and Eurasia c...

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Autores principales:	Morgan T. Jones, Lars E. Augland, Grace E. Shephard, Seth D. Burgess, Gauti T. Eliassen, Malte M. Jochmann, Bjarki Friis, Dougal A. Jerram, Sverre Planke, Henrik H. Svensen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d6aff2ff8819419381a811ca24ba29b1
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spelling	oai:doaj.org-article:d6aff2ff8819419381a811ca24ba29b12021-12-02T15:05:57ZConstraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers10.1038/s41598-017-06170-72045-2322https://doaj.org/article/d6aff2ff8819419381a811ca24ba29b12017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06170-7https://doaj.org/toc/2045-2322Abstract Radioisotopic dating of volcanic minerals is a powerful method for establishing absolute time constraints in sedimentary basins, which improves our understanding of the chronostratigraphy and evolution of basin processes. The relative plate motions of Greenland, North America, and Eurasia changed several times during the Palaeogene. However, the timing of a key part of this sequence, namely the initiation of compression between Greenland and Svalbard, is currently poorly constrained. The formation of the Central Basin in Spitsbergen is inherently linked to changes in regional plate motions, so an improved chronostratigraphy of the sedimentary sequence is warranted. Here we present U-Pb zircon dates from tephra layers close to the basal unconformity, which yield a weighted-mean 206Pb/238U age of 61.596 ± 0.028 Ma (2σ). We calculate that sustained sedimentation began at ~61.8 Ma in the eastern Central Basin based on a sediment accumulation rate of 71.6 ± 7.6 m/Myr. The timing of basin formation is broadly coeval with depositional changes at the Danian-Selandian boundary around the other margins of Greenland, including the North Sea, implying a common tectonic driving force. Furthermore, these stratigraphic tie points place age constraints on regional plate reorganization events, such as the onset of seafloor spreading in the Labrador Sea.Morgan T. JonesLars E. AuglandGrace E. ShephardSeth D. BurgessGauti T. EliassenMalte M. JochmannBjarki FriisDougal A. JerramSverre PlankeHenrik H. SvensenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Morgan T. Jones Lars E. Augland Grace E. Shephard Seth D. Burgess Gauti T. Eliassen Malte M. Jochmann Bjarki Friis Dougal A. Jerram Sverre Planke Henrik H. Svensen Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
description	Abstract Radioisotopic dating of volcanic minerals is a powerful method for establishing absolute time constraints in sedimentary basins, which improves our understanding of the chronostratigraphy and evolution of basin processes. The relative plate motions of Greenland, North America, and Eurasia changed several times during the Palaeogene. However, the timing of a key part of this sequence, namely the initiation of compression between Greenland and Svalbard, is currently poorly constrained. The formation of the Central Basin in Spitsbergen is inherently linked to changes in regional plate motions, so an improved chronostratigraphy of the sedimentary sequence is warranted. Here we present U-Pb zircon dates from tephra layers close to the basal unconformity, which yield a weighted-mean 206Pb/238U age of 61.596 ± 0.028 Ma (2σ). We calculate that sustained sedimentation began at ~61.8 Ma in the eastern Central Basin based on a sediment accumulation rate of 71.6 ± 7.6 m/Myr. The timing of basin formation is broadly coeval with depositional changes at the Danian-Selandian boundary around the other margins of Greenland, including the North Sea, implying a common tectonic driving force. Furthermore, these stratigraphic tie points place age constraints on regional plate reorganization events, such as the onset of seafloor spreading in the Labrador Sea.
format	article
author	Morgan T. Jones Lars E. Augland Grace E. Shephard Seth D. Burgess Gauti T. Eliassen Malte M. Jochmann Bjarki Friis Dougal A. Jerram Sverre Planke Henrik H. Svensen
author_facet	Morgan T. Jones Lars E. Augland Grace E. Shephard Seth D. Burgess Gauti T. Eliassen Malte M. Jochmann Bjarki Friis Dougal A. Jerram Sverre Planke Henrik H. Svensen
author_sort	Morgan T. Jones
title	Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
title_short	Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
title_full	Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
title_fullStr	Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
title_full_unstemmed	Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers
title_sort	constraining shifts in north atlantic plate motions during the palaeocene by u-pb dating of svalbard tephra layers
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d6aff2ff8819419381a811ca24ba29b1
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Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers

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