Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica
The North Kara Terrane (NKT), with Severnaya Zemlya as its main outcrop area, constitutes the Palaeozoic and older rocks of the northern part of the Kara Shelf. Potential field data suggest a continuation into the eastern Barents Shelf. Several lines of evidence imply that the NKT was a part of Balt...
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Uppsala universitet, Institutionen för geovetenskaper
2005
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ftuppsalauniv:oai:DiVA.org:uu-5851 2023-05-15T15:03:51+02:00 Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica Lorenz, Henning 2005 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5851 eng eng Uppsala universitet, Institutionen för geovetenskaper Uppsala : Acta Universitatis Upsaliensis Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 68 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5851 urn:isbn:91-554-6286-3 info:eu-repo/semantics/openAccess Earth sciences Arctic Severnaya Zemlya North Kara Terrane Baltica bedrock geology tectonics Timanides Caledonides Geovetenskap Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2005 ftuppsalauniv 2023-02-23T22:00:45Z The North Kara Terrane (NKT), with Severnaya Zemlya as its main outcrop area, constitutes the Palaeozoic and older rocks of the northern part of the Kara Shelf. Potential field data suggest a continuation into the eastern Barents Shelf. Several lines of evidence imply that the NKT was a part of Baltica at least during the latter part of the Neoproterozoic, and probably was influenced by Timanian orogeny. The Timanide type area is characterised by metaturbidites from the pre-Timanian passive margin of the East European Craton (EEC). Regional amphibolite facies metamorphism, as exposed on Kanin Peninsula, was probably followed by near-isothermal decompression. It is inferred that these conditions were reached by depression beneath the accreted outboard terranes. Subsequently, the metaturbidites were thrust into their present position onto the EEC’s pericratonic unmetamorphosed shelf sediments. The thrusting was accompanied by rapid exhumation. About 560 Ma late-orogenic granites intrude the Timanian accreted terranes. On Severnaya Zemlya, Neoproterozoic turbidites, containing ca. 560 Ma zircons, are overlain by shelf deposits, which dominate the Palaeozoic until the end of the Silurian. The succession is interrupted by the regional Kan’on (canyon) River Unconformity and probably by a late Neoproterozoic unconformity. New U-Th-Pb ion-microprobe isotope-ages on volcanics and faunal evidence imply that the Kan'on River Unconformity developed in a short time span around the Cambrian-Ordovician boundary. Other isotope-ages demonstrate that intense igneous activity, which has been inferred to be related to rifting within the NKT, extended into the Arenig and was contemporaneous with the development of Baltica’s northeastern passive margin. Zircon xenocrysts (ca. 540 - 580 Ma) in these igneous rocks indicate a Timanian component in the crust below the Severnaya Zemlya Archipelago. In the latest Silurian, Old Red Sandstone facies sedimentation began with the migration of an inferred Caledonian foreland basin into the area ... Doctoral or Postdoctoral Thesis Arctic Kanin peninsula Severnaya Zemlya Uppsala University: Publications (DiVA) Arctic Canyon River ENVELOPE(-84.052,-84.052,65.185,65.185) Severnaya Zemlya ENVELOPE(98.000,98.000,79.500,79.500) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Earth sciences Arctic Severnaya Zemlya North Kara Terrane Baltica bedrock geology tectonics Timanides Caledonides Geovetenskap Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Earth sciences Arctic Severnaya Zemlya North Kara Terrane Baltica bedrock geology tectonics Timanides Caledonides Geovetenskap Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Lorenz, Henning Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
topic_facet |
Earth sciences Arctic Severnaya Zemlya North Kara Terrane Baltica bedrock geology tectonics Timanides Caledonides Geovetenskap Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
The North Kara Terrane (NKT), with Severnaya Zemlya as its main outcrop area, constitutes the Palaeozoic and older rocks of the northern part of the Kara Shelf. Potential field data suggest a continuation into the eastern Barents Shelf. Several lines of evidence imply that the NKT was a part of Baltica at least during the latter part of the Neoproterozoic, and probably was influenced by Timanian orogeny. The Timanide type area is characterised by metaturbidites from the pre-Timanian passive margin of the East European Craton (EEC). Regional amphibolite facies metamorphism, as exposed on Kanin Peninsula, was probably followed by near-isothermal decompression. It is inferred that these conditions were reached by depression beneath the accreted outboard terranes. Subsequently, the metaturbidites were thrust into their present position onto the EEC’s pericratonic unmetamorphosed shelf sediments. The thrusting was accompanied by rapid exhumation. About 560 Ma late-orogenic granites intrude the Timanian accreted terranes. On Severnaya Zemlya, Neoproterozoic turbidites, containing ca. 560 Ma zircons, are overlain by shelf deposits, which dominate the Palaeozoic until the end of the Silurian. The succession is interrupted by the regional Kan’on (canyon) River Unconformity and probably by a late Neoproterozoic unconformity. New U-Th-Pb ion-microprobe isotope-ages on volcanics and faunal evidence imply that the Kan'on River Unconformity developed in a short time span around the Cambrian-Ordovician boundary. Other isotope-ages demonstrate that intense igneous activity, which has been inferred to be related to rifting within the NKT, extended into the Arenig and was contemporaneous with the development of Baltica’s northeastern passive margin. Zircon xenocrysts (ca. 540 - 580 Ma) in these igneous rocks indicate a Timanian component in the crust below the Severnaya Zemlya Archipelago. In the latest Silurian, Old Red Sandstone facies sedimentation began with the migration of an inferred Caledonian foreland basin into the area ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Lorenz, Henning |
author_facet |
Lorenz, Henning |
author_sort |
Lorenz, Henning |
title |
Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
title_short |
Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
title_full |
Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
title_fullStr |
Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
title_full_unstemmed |
Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica |
title_sort |
eurasian arctic tectonics: geology of severnaya zemlya (north kara terrane) and relationships to the timanide margin of baltica |
publisher |
Uppsala universitet, Institutionen för geovetenskaper |
publishDate |
2005 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5851 |
long_lat |
ENVELOPE(-84.052,-84.052,65.185,65.185) ENVELOPE(98.000,98.000,79.500,79.500) |
geographic |
Arctic Canyon River Severnaya Zemlya |
geographic_facet |
Arctic Canyon River Severnaya Zemlya |
genre |
Arctic Kanin peninsula Severnaya Zemlya |
genre_facet |
Arctic Kanin peninsula Severnaya Zemlya |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 68 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5851 urn:isbn:91-554-6286-3 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766335701495840768 |