Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard
The Svalbard Archipelago consists of three basement terranes that record a complex Neoproterozoic–Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) and two episodes of collapse- to rift-related extension (Devonian–Carboniferous and...
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Copernicus Publications
2022
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ftdoajarticles:oai:doaj.org/article:007070a57a3545e7a0d6546097b5df4d 2023-05-15T15:38:24+02:00 Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard J.-B. P. Koehl C. Magee I. M. Anell 2022-01-01T00:00:00Z https://doi.org/10.5194/se-13-85-2022 https://doaj.org/article/007070a57a3545e7a0d6546097b5df4d EN eng Copernicus Publications https://se.copernicus.org/articles/13/85/2022/se-13-85-2022.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-13-85-2022 1869-9510 1869-9529 https://doaj.org/article/007070a57a3545e7a0d6546097b5df4d Solid Earth, Vol 13, Pp 85-115 (2022) Geology QE1-996.5 Stratigraphy QE640-699 article 2022 ftdoajarticles https://doi.org/10.5194/se-13-85-2022 2022-12-31T16:30:13Z The Svalbard Archipelago consists of three basement terranes that record a complex Neoproterozoic–Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) and two episodes of collapse- to rift-related extension (Devonian–Carboniferous and late Cenozoic). Previous studies suggest that these three terranes likely accreted during the early to mid-Paleozoic Caledonian and Ellesmerian orogenies. Yet recent geochronological analyses show that the northwestern and southwestern terranes of Svalbard both record an episode of amphibolite (–eclogite) facies metamorphism in the latest Neoproterozoic, which may relate to the 650–550 Ma Timanian Orogeny identified in northwestern Russia, northern Norway, and the Russian Barents Sea. However, discrete Timanian structures have yet to be identified in Svalbard and the Norwegian Barents Sea. Through analysis of seismic reflection, as well as regional gravimetric and magnetic data, this study demonstrates the presence of continuous thrust systems that are several kilometers thick, NNE-dipping, deeply buried, and extend thousands of kilometers from northwestern Russia to northeastern Norway, the northern Norwegian Barents Sea, and the Svalbard Archipelago. The consistency in orientation and geometry, as well as apparent linkage between these thrust systems and those recognized as part of the Timanian Orogeny in northwestern Russia and Novaya Zemlya, suggests that the mapped structures are likely Timanian. If correct, these findings would imply that Svalbard's three basement terranes and the Barents Sea were accreted onto northern Norway during the Timanian Orogeny and should hence be attached to Baltica and northwestern Russia in future Neoproterozoic–early Paleozoic plate tectonics reconstructions. In the Phanerozoic, the study suggests that the interpreted Timanian thrust systems represent major preexisting zones of weakness that were reactivated, folded, and overprinted by (i.e., controlled the formation of new) ... Article in Journal/Newspaper Barents Sea Northern Norway Novaya Zemlya Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Barents Sea Svalbard Archipelago Norway Solid Earth 13 1 85 115 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Stratigraphy QE640-699 |
spellingShingle |
Geology QE1-996.5 Stratigraphy QE640-699 J.-B. P. Koehl C. Magee I. M. Anell Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
topic_facet |
Geology QE1-996.5 Stratigraphy QE640-699 |
description |
The Svalbard Archipelago consists of three basement terranes that record a complex Neoproterozoic–Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) and two episodes of collapse- to rift-related extension (Devonian–Carboniferous and late Cenozoic). Previous studies suggest that these three terranes likely accreted during the early to mid-Paleozoic Caledonian and Ellesmerian orogenies. Yet recent geochronological analyses show that the northwestern and southwestern terranes of Svalbard both record an episode of amphibolite (–eclogite) facies metamorphism in the latest Neoproterozoic, which may relate to the 650–550 Ma Timanian Orogeny identified in northwestern Russia, northern Norway, and the Russian Barents Sea. However, discrete Timanian structures have yet to be identified in Svalbard and the Norwegian Barents Sea. Through analysis of seismic reflection, as well as regional gravimetric and magnetic data, this study demonstrates the presence of continuous thrust systems that are several kilometers thick, NNE-dipping, deeply buried, and extend thousands of kilometers from northwestern Russia to northeastern Norway, the northern Norwegian Barents Sea, and the Svalbard Archipelago. The consistency in orientation and geometry, as well as apparent linkage between these thrust systems and those recognized as part of the Timanian Orogeny in northwestern Russia and Novaya Zemlya, suggests that the mapped structures are likely Timanian. If correct, these findings would imply that Svalbard's three basement terranes and the Barents Sea were accreted onto northern Norway during the Timanian Orogeny and should hence be attached to Baltica and northwestern Russia in future Neoproterozoic–early Paleozoic plate tectonics reconstructions. In the Phanerozoic, the study suggests that the interpreted Timanian thrust systems represent major preexisting zones of weakness that were reactivated, folded, and overprinted by (i.e., controlled the formation of new) ... |
format |
Article in Journal/Newspaper |
author |
J.-B. P. Koehl C. Magee I. M. Anell |
author_facet |
J.-B. P. Koehl C. Magee I. M. Anell |
author_sort |
J.-B. P. Koehl |
title |
Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
title_short |
Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
title_full |
Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
title_fullStr |
Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
title_full_unstemmed |
Impact of Timanian thrust systems on the late Neoproterozoic–Phanerozoic tectonic evolution of the Barents Sea and Svalbard |
title_sort |
impact of timanian thrust systems on the late neoproterozoic–phanerozoic tectonic evolution of the barents sea and svalbard |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/se-13-85-2022 https://doaj.org/article/007070a57a3545e7a0d6546097b5df4d |
geographic |
Svalbard Barents Sea Svalbard Archipelago Norway |
geographic_facet |
Svalbard Barents Sea Svalbard Archipelago Norway |
genre |
Barents Sea Northern Norway Novaya Zemlya Svalbard |
genre_facet |
Barents Sea Northern Norway Novaya Zemlya Svalbard |
op_source |
Solid Earth, Vol 13, Pp 85-115 (2022) |
op_relation |
https://se.copernicus.org/articles/13/85/2022/se-13-85-2022.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-13-85-2022 1869-9510 1869-9529 https://doaj.org/article/007070a57a3545e7a0d6546097b5df4d |
op_doi |
https://doi.org/10.5194/se-13-85-2022 |
container_title |
Solid Earth |
container_volume |
13 |
container_issue |
1 |
container_start_page |
85 |
op_container_end_page |
115 |
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1766369303132635136 |