Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen
Tectonic models for development of the Svalbard Caledonides depend on reliable assessment of the metamorphic evolution of the various basement provinces involved. The Mosselhalvøya Group (MG) and the Atomfjella Complex (AC) have previously been assigned to the Nordaustlandet and West Ny-Friesland te...
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crcansciencepubl:10.1139/cjes-2022-0002 2023-12-17T10:28:11+01:00 Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen Bazarnik, Jakub Kośmińska, Karolina McClelland, William C. Strauss, Justin V. Piepjohn, Karsten Elvevold, Synnøve Zieliński, Grzegorz Majka, Jarosław 2023 http://dx.doi.org/10.1139/cjes-2022-0002 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2022-0002 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2022-0002 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 60, issue 8, page 1188-1205 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2023 crcansciencepubl https://doi.org/10.1139/cjes-2022-0002 2023-11-19T13:38:46Z Tectonic models for development of the Svalbard Caledonides depend on reliable assessment of the metamorphic evolution of the various basement provinces involved. The Mosselhalvøya Group (MG) and the Atomfjella Complex (AC) have previously been assigned to the Nordaustlandet and West Ny-Friesland terranes, respectively. New analytical data and petrographic observations indicate that both units experienced two-stage metamorphism under similar pressure–temperature (P–T) conditions. Two stages of amphibolite facies metamorphism (M1 and M2) are clearly recorded by garnet and staurolite porphyroblast textures. The results of thermodynamic phase equilibrium modeling indicate that peak M2 metamorphism occurred at ∼7–7.5 kbar and 590–600 °C in both units. Zirconium-in-rutile trace element thermometry confirms the temperature estimates for M1 and M2 stages of metamorphism. Monazite chemical Th-U-Pb dates from the MG resolve a two-stage garnet growth at 444 ± 7 Ma (M1) and 423 ± 6 Ma (M2). In contrast, monazite dated in the AC defines a single age of 420 ± 4 Ma interpreted as M2 growth. We suggest M2 was coeval with early strike-slip motion along the Billefjorden Fault Zone, whereas M1 reflects initial tectonic burial of the studied units. The similarity in metamorphic history between the both units suggests that the boundary between them is a subordinate thrust fault within the Atomfjella thrust stack rather than a major boundary separating the Nordaustlandet and West Ny-Friesland terranes. The MG should be included within the West Ny-Friesland terrane and the tectonic boundary with the Nordaustlandet terrane is likely the Eolussletta Shear Zone. Article in Journal/Newspaper Billefjorden Nordaustlandet Ny Friesland Svalbard Spitsbergen Canadian Science Publishing (via Crossref) Svalbard Nordaustlandet ENVELOPE(22.400,22.400,79.800,79.800) Billefjorden ENVELOPE(16.417,16.417,78.563,78.563) Ny Friesland ENVELOPE(16.847,16.847,79.498,79.498) Mosselhalvøya ENVELOPE(16.340,16.340,79.947,79.947) Eolussletta ENVELOPE(16.534,16.534,79.969,79.969) Canadian Journal of Earth Sciences 60 8 1188 1205 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Bazarnik, Jakub Kośmińska, Karolina McClelland, William C. Strauss, Justin V. Piepjohn, Karsten Elvevold, Synnøve Zieliński, Grzegorz Majka, Jarosław Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
topic_facet |
General Earth and Planetary Sciences |
description |
Tectonic models for development of the Svalbard Caledonides depend on reliable assessment of the metamorphic evolution of the various basement provinces involved. The Mosselhalvøya Group (MG) and the Atomfjella Complex (AC) have previously been assigned to the Nordaustlandet and West Ny-Friesland terranes, respectively. New analytical data and petrographic observations indicate that both units experienced two-stage metamorphism under similar pressure–temperature (P–T) conditions. Two stages of amphibolite facies metamorphism (M1 and M2) are clearly recorded by garnet and staurolite porphyroblast textures. The results of thermodynamic phase equilibrium modeling indicate that peak M2 metamorphism occurred at ∼7–7.5 kbar and 590–600 °C in both units. Zirconium-in-rutile trace element thermometry confirms the temperature estimates for M1 and M2 stages of metamorphism. Monazite chemical Th-U-Pb dates from the MG resolve a two-stage garnet growth at 444 ± 7 Ma (M1) and 423 ± 6 Ma (M2). In contrast, monazite dated in the AC defines a single age of 420 ± 4 Ma interpreted as M2 growth. We suggest M2 was coeval with early strike-slip motion along the Billefjorden Fault Zone, whereas M1 reflects initial tectonic burial of the studied units. The similarity in metamorphic history between the both units suggests that the boundary between them is a subordinate thrust fault within the Atomfjella thrust stack rather than a major boundary separating the Nordaustlandet and West Ny-Friesland terranes. The MG should be included within the West Ny-Friesland terrane and the tectonic boundary with the Nordaustlandet terrane is likely the Eolussletta Shear Zone. |
format |
Article in Journal/Newspaper |
author |
Bazarnik, Jakub Kośmińska, Karolina McClelland, William C. Strauss, Justin V. Piepjohn, Karsten Elvevold, Synnøve Zieliński, Grzegorz Majka, Jarosław |
author_facet |
Bazarnik, Jakub Kośmińska, Karolina McClelland, William C. Strauss, Justin V. Piepjohn, Karsten Elvevold, Synnøve Zieliński, Grzegorz Majka, Jarosław |
author_sort |
Bazarnik, Jakub |
title |
Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
title_short |
Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
title_full |
Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
title_fullStr |
Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
title_full_unstemmed |
Reinterpretation of a major terrane boundary in the northern Svalbard Caledonides based on metamorphic fingerprinting of rocks in northern Spitsbergen |
title_sort |
reinterpretation of a major terrane boundary in the northern svalbard caledonides based on metamorphic fingerprinting of rocks in northern spitsbergen |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1139/cjes-2022-0002 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2022-0002 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2022-0002 |
long_lat |
ENVELOPE(22.400,22.400,79.800,79.800) ENVELOPE(16.417,16.417,78.563,78.563) ENVELOPE(16.847,16.847,79.498,79.498) ENVELOPE(16.340,16.340,79.947,79.947) ENVELOPE(16.534,16.534,79.969,79.969) |
geographic |
Svalbard Nordaustlandet Billefjorden Ny Friesland Mosselhalvøya Eolussletta |
geographic_facet |
Svalbard Nordaustlandet Billefjorden Ny Friesland Mosselhalvøya Eolussletta |
genre |
Billefjorden Nordaustlandet Ny Friesland Svalbard Spitsbergen |
genre_facet |
Billefjorden Nordaustlandet Ny Friesland Svalbard Spitsbergen |
op_source |
Canadian Journal of Earth Sciences volume 60, issue 8, page 1188-1205 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2022-0002 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
60 |
container_issue |
8 |
container_start_page |
1188 |
op_container_end_page |
1205 |
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1785580224484737024 |