Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield
The Raahe–Ladoga Shear Complex is a major crustal structure representing the Archaean–Palaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny ( c . 1.9 – 1.8 Ga) beginning with regional thrust tectonic phases D 1 and D 2 , followed by large-scale...
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ftdatacite:10.6084/m9.figshare.c.3498501 2023-05-15T16:12:54+02:00 Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield Woodard, Jeremy Tuisku, Pekka Kärki, Aulis Lahaye, Yann Jarosław Majka Huhma, Hannu Whitehouse, Martin J. 2016 https://dx.doi.org/10.6084/m9.figshare.c.3498501 https://figshare.com/collections/Zircon_and_monazite_geochronology_of_deformation_in_the_Pielavesi_Shear_Zone_Finland_multistage_evolution_of_the_Archaean_Proterozoic_boundary_in_the_Fennoscandian_Shield/3498501 unknown Figshare https://dx.doi.org/10.1144/jgs2016-020 CC-BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2016 ftdatacite https://doi.org/10.6084/m9.figshare.c.3498501 https://doi.org/10.1144/jgs2016-020 2021-11-05T12:55:41Z The Raahe–Ladoga Shear Complex is a major crustal structure representing the Archaean–Palaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny ( c . 1.9 – 1.8 Ga) beginning with regional thrust tectonic phases D 1 and D 2 , followed by large-scale shearing events D 3 and D 4 . The Pielavesi Shear Zone is a vertical north–south-trending shear zone within the Raahe–Ladoga Shear Complex formed during regional D 3 shearing and later reactivated during the regional D 4 phase. Three north–south-trending elongate granitoid intrusions were selected as representative of silicic melts that intruded the transtensional Pielavesi Shear Zone during the regional D 3 phase. The oriented magmatic fabric of the granitoids indicates that they intruded coeval to the deformation event. The zircon U– (Th) –Pb secondary ionization mass spectrometry (SIMS) ages of these intrusions (1888 ± 4, 1884 ± 6 and 1883 ± 5 Ma) overlap within error and provide a direct age for the regional D 3 deformation. ε Hf(T) (–1.1 to +3.4) and ε Nd(T) (–1.2 to +0.4) values from these granitoids are both consistent with a predominantly juvenile source affected by a minor Archaean component. U– (Th) –Pb SIMS analyses of metamorphic monazite formed within a crosscutting blastomylonite provide an age for the regional D 4 phase and associated fluid activity of 1793 ± 3 Ma. Article in Journal/Newspaper Fennoscandian DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
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Geology FOS Earth and related environmental sciences Woodard, Jeremy Tuisku, Pekka Kärki, Aulis Lahaye, Yann Jarosław Majka Huhma, Hannu Whitehouse, Martin J. Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The Raahe–Ladoga Shear Complex is a major crustal structure representing the Archaean–Palaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny ( c . 1.9 – 1.8 Ga) beginning with regional thrust tectonic phases D 1 and D 2 , followed by large-scale shearing events D 3 and D 4 . The Pielavesi Shear Zone is a vertical north–south-trending shear zone within the Raahe–Ladoga Shear Complex formed during regional D 3 shearing and later reactivated during the regional D 4 phase. Three north–south-trending elongate granitoid intrusions were selected as representative of silicic melts that intruded the transtensional Pielavesi Shear Zone during the regional D 3 phase. The oriented magmatic fabric of the granitoids indicates that they intruded coeval to the deformation event. The zircon U– (Th) –Pb secondary ionization mass spectrometry (SIMS) ages of these intrusions (1888 ± 4, 1884 ± 6 and 1883 ± 5 Ma) overlap within error and provide a direct age for the regional D 3 deformation. ε Hf(T) (–1.1 to +3.4) and ε Nd(T) (–1.2 to +0.4) values from these granitoids are both consistent with a predominantly juvenile source affected by a minor Archaean component. U– (Th) –Pb SIMS analyses of metamorphic monazite formed within a crosscutting blastomylonite provide an age for the regional D 4 phase and associated fluid activity of 1793 ± 3 Ma. |
format |
Article in Journal/Newspaper |
author |
Woodard, Jeremy Tuisku, Pekka Kärki, Aulis Lahaye, Yann Jarosław Majka Huhma, Hannu Whitehouse, Martin J. |
author_facet |
Woodard, Jeremy Tuisku, Pekka Kärki, Aulis Lahaye, Yann Jarosław Majka Huhma, Hannu Whitehouse, Martin J. |
author_sort |
Woodard, Jeremy |
title |
Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
title_short |
Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
title_full |
Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
title_fullStr |
Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
title_full_unstemmed |
Zircon and monazite geochronology of deformation in the Pielavesi Shear Zone, Finland: multistage evolution of the Archaean–Proterozoic boundary in the Fennoscandian Shield |
title_sort |
zircon and monazite geochronology of deformation in the pielavesi shear zone, finland: multistage evolution of the archaean–proterozoic boundary in the fennoscandian shield |
publisher |
Figshare |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3498501 https://figshare.com/collections/Zircon_and_monazite_geochronology_of_deformation_in_the_Pielavesi_Shear_Zone_Finland_multistage_evolution_of_the_Archaean_Proterozoic_boundary_in_the_Fennoscandian_Shield/3498501 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
https://dx.doi.org/10.1144/jgs2016-020 |
op_rights |
CC-BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3498501 https://doi.org/10.1144/jgs2016-020 |
_version_ |
1765998513130307584 |