Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic
Geochronological studies in northern Wedel Jarlsberg Land, southwestern Svalbard (Norway), showed that the Tonian (c. 950 Ma) igneous rocks were subjected to metamorphism during the Torellian (c. 640 Ma) and early Caledonian (470–460 Ma) events. Predominant augen gneisses, derived from a Tonian prot...
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crcansciencepubl:10.1139/cjes-2015-0142 2024-09-15T18:04:47+00:00 Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic Majka, Jarosław Kośmińska, Karolina Mazur, Stanisław Czerny, Jerzy Piepjohn, Karsten Dwornik, Maciej Manecki, Maciej 2015 http://dx.doi.org/10.1139/cjes-2015-0142 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2015-0142 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2015-0142 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 52, issue 12, page 1045-1061 ISSN 0008-4077 1480-3313 journal-article 2015 crcansciencepubl https://doi.org/10.1139/cjes-2015-0142 2024-08-01T04:10:00Z Geochronological studies in northern Wedel Jarlsberg Land, southwestern Svalbard (Norway), showed that the Tonian (c. 950 Ma) igneous rocks were subjected to metamorphism during the Torellian (c. 640 Ma) and early Caledonian (470–460 Ma) events. Predominant augen gneisses, derived from a Tonian protolith, are intercalated in that area, with schists comprising two distinct metamorphic mineral assemblages. The M1 (Torellian) assemblage containing garnet-I + quartz + plagioclase-I + biotite-I + muscovite-I was formed under amphibolite-facies conditions at c. 550–600 °C and 5–8 kbar (1 kbar = 100 MPa). The M2 (Caledonian) assemblage comprising garnet-II + quartz + plagioclase-II + biotite-II + muscovite-II + zoisite + chlorite crystallized at c. 500–550 °C and 9–12 kbar, corresponding to epidote–amphibolite facies conditions. The M2 mineral assemblage constitutes the pervasive Caledonian fabric of the schists that was subsequently reactivated in a left-lateral strike-slip shear regime. The subsequent c. 70° clockwise rotation of the original structure to its present position was caused by a large-scale passive rotation during the Paleogene Eurekan orogeny. The new pressure–temperature estimates suggest that metamorphic basement in the study area was consolidated during the Torellian middle-grade event and then overprinted by Caledonian moderate- to high-pressure subduction-related metamorphism. A following sinistral shear zone assembled the present structure of basement units. Our results pose a question about the possible extent of Torellian precursor to the Caledonian basement across the High Arctic and the scale of its subsequent involvement in early Caledonian subduction. In conjunction with previous studies, the results suggest a possible correlation between southwestern Spitsbergen and the Pearya Terrane in Ellesmere Island. Article in Journal/Newspaper Ellesmere Island Svalbard Wedel Jarlsberg Land Spitsbergen Canadian Science Publishing Canadian Journal of Earth Sciences 52 12 1045 1061 |
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Canadian Science Publishing |
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English |
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Geochronological studies in northern Wedel Jarlsberg Land, southwestern Svalbard (Norway), showed that the Tonian (c. 950 Ma) igneous rocks were subjected to metamorphism during the Torellian (c. 640 Ma) and early Caledonian (470–460 Ma) events. Predominant augen gneisses, derived from a Tonian protolith, are intercalated in that area, with schists comprising two distinct metamorphic mineral assemblages. The M1 (Torellian) assemblage containing garnet-I + quartz + plagioclase-I + biotite-I + muscovite-I was formed under amphibolite-facies conditions at c. 550–600 °C and 5–8 kbar (1 kbar = 100 MPa). The M2 (Caledonian) assemblage comprising garnet-II + quartz + plagioclase-II + biotite-II + muscovite-II + zoisite + chlorite crystallized at c. 500–550 °C and 9–12 kbar, corresponding to epidote–amphibolite facies conditions. The M2 mineral assemblage constitutes the pervasive Caledonian fabric of the schists that was subsequently reactivated in a left-lateral strike-slip shear regime. The subsequent c. 70° clockwise rotation of the original structure to its present position was caused by a large-scale passive rotation during the Paleogene Eurekan orogeny. The new pressure–temperature estimates suggest that metamorphic basement in the study area was consolidated during the Torellian middle-grade event and then overprinted by Caledonian moderate- to high-pressure subduction-related metamorphism. A following sinistral shear zone assembled the present structure of basement units. Our results pose a question about the possible extent of Torellian precursor to the Caledonian basement across the High Arctic and the scale of its subsequent involvement in early Caledonian subduction. In conjunction with previous studies, the results suggest a possible correlation between southwestern Spitsbergen and the Pearya Terrane in Ellesmere Island. |
format |
Article in Journal/Newspaper |
author |
Majka, Jarosław Kośmińska, Karolina Mazur, Stanisław Czerny, Jerzy Piepjohn, Karsten Dwornik, Maciej Manecki, Maciej |
spellingShingle |
Majka, Jarosław Kośmińska, Karolina Mazur, Stanisław Czerny, Jerzy Piepjohn, Karsten Dwornik, Maciej Manecki, Maciej Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
author_facet |
Majka, Jarosław Kośmińska, Karolina Mazur, Stanisław Czerny, Jerzy Piepjohn, Karsten Dwornik, Maciej Manecki, Maciej |
author_sort |
Majka, Jarosław |
title |
Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
title_short |
Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
title_full |
Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
title_fullStr |
Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
title_full_unstemmed |
Two garnet growth events in polymetamorphic rocks in southwest Spitsbergen, Norway: insight in the history of Neoproterozoic and early Paleozoic metamorphism in the High Arctic |
title_sort |
two garnet growth events in polymetamorphic rocks in southwest spitsbergen, norway: insight in the history of neoproterozoic and early paleozoic metamorphism in the high arctic |
publisher |
Canadian Science Publishing |
publishDate |
2015 |
url |
http://dx.doi.org/10.1139/cjes-2015-0142 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2015-0142 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2015-0142 |
genre |
Ellesmere Island Svalbard Wedel Jarlsberg Land Spitsbergen |
genre_facet |
Ellesmere Island Svalbard Wedel Jarlsberg Land Spitsbergen |
op_source |
Canadian Journal of Earth Sciences volume 52, issue 12, page 1045-1061 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2015-0142 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
52 |
container_issue |
12 |
container_start_page |
1045 |
op_container_end_page |
1061 |
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1810442395731361792 |