Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides)
The occurrence of pre-collisional structural and metamorphic fabrics may control the development of new structures during subsequent orogenic deformation. Structural, petrological and geochronological analyses have been performed on selected samples collected along a NW-SE cross section of the Kalak...
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ftopenunivgb:oai:oro.open.ac.uk:70123 2023-06-11T04:11:42+02:00 Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) Ceccato, A. Menegon, L. Warren, C. J. Halton, A. M. 2020-07 text/html application/pdf https://oro.open.ac.uk/70123/ https://oro.open.ac.uk/70123/1/70123.htm https://oro.open.ac.uk/70123/3/Ceccato_etal_%28KNC%29_revisedMS.pdf https://doi.org/10.1016/j.jsg.2020.104057 unknown Elsevier https://oro.open.ac.uk/70123/1/70123.htm https://oro.open.ac.uk/70123/3/Ceccato_etal_%28KNC%29_revisedMS.pdf Ceccato, A.; Menegon, L.; Warren, C. J. <http://oro.open.ac.uk/view/person/cw6522.html> and Halton, A. M. <http://oro.open.ac.uk/view/person/amh656.html> (2020). Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides). Journal of Structural Geology, 136, article no. 104057. Journal Item Public PeerReviewed 2020 ftopenunivgb https://doi.org/10.1016/j.jsg.2020.104057 2023-05-28T06:03:25Z The occurrence of pre-collisional structural and metamorphic fabrics may control the development of new structures during subsequent orogenic deformation. Structural, petrological and geochronological analyses have been performed on selected samples collected along a NW-SE cross section of the Kalak Nappe Complex (KNC) exposed on Kvaløya Island (Finnmark, Norway), in order to define pre-Caledonian or Caledonian affinity of deformation fabrics. Nappes within the KNC experienced different pre-collisional tectonometamorphic histories, resulting in contrasting pre-Caledonian fabrics, which in turn controlled orogen-scale strain partitioning and metamorphic re-equilibration during Caledonian shortening. Caledonian deformation during top-to-SE-directed thrusting occurred at 550–675 °C and 0.8–1.0 GPa in the presence of fluid. Suitably-oriented pre-collisional fabrics were firstly exploited as zones of localized shearing internal to the Nappe and subjected to metamorphic re-equilibration during shortening. Fold geometry during Caledonian thrusting was also controlled by the orientation of pre-Caledonian fabrics. SE-verging asymmetric folds were developed after minor tilting of pre-Caledonian upright folds with orogen-parallel hinge in the hinterland consistently with top-to-SE shearing. Shear-parallel folds displaying orogen-perpendicular hinge lines resulted from top-to-SE general shearing of pre-collisional upright folds showing pre-collisional orogen-perpendicular hinge lines. Caledonian metamorphism appears to have been accompanied by infiltration of radiogenic 40Ar-rich fluids, which affected the Ar isotopic system in synkinematic micas. Article in Journal/Newspaper Finnmark Kvaløya Finnmark The Open University: Open Research Online (ORO) Kalak ENVELOPE(27.055,27.055,70.611,70.611) Norway Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Journal of Structural Geology 136 104057 |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
The occurrence of pre-collisional structural and metamorphic fabrics may control the development of new structures during subsequent orogenic deformation. Structural, petrological and geochronological analyses have been performed on selected samples collected along a NW-SE cross section of the Kalak Nappe Complex (KNC) exposed on Kvaløya Island (Finnmark, Norway), in order to define pre-Caledonian or Caledonian affinity of deformation fabrics. Nappes within the KNC experienced different pre-collisional tectonometamorphic histories, resulting in contrasting pre-Caledonian fabrics, which in turn controlled orogen-scale strain partitioning and metamorphic re-equilibration during Caledonian shortening. Caledonian deformation during top-to-SE-directed thrusting occurred at 550–675 °C and 0.8–1.0 GPa in the presence of fluid. Suitably-oriented pre-collisional fabrics were firstly exploited as zones of localized shearing internal to the Nappe and subjected to metamorphic re-equilibration during shortening. Fold geometry during Caledonian thrusting was also controlled by the orientation of pre-Caledonian fabrics. SE-verging asymmetric folds were developed after minor tilting of pre-Caledonian upright folds with orogen-parallel hinge in the hinterland consistently with top-to-SE shearing. Shear-parallel folds displaying orogen-perpendicular hinge lines resulted from top-to-SE general shearing of pre-collisional upright folds showing pre-collisional orogen-perpendicular hinge lines. Caledonian metamorphism appears to have been accompanied by infiltration of radiogenic 40Ar-rich fluids, which affected the Ar isotopic system in synkinematic micas. |
format |
Article in Journal/Newspaper |
author |
Ceccato, A. Menegon, L. Warren, C. J. Halton, A. M. |
spellingShingle |
Ceccato, A. Menegon, L. Warren, C. J. Halton, A. M. Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
author_facet |
Ceccato, A. Menegon, L. Warren, C. J. Halton, A. M. |
author_sort |
Ceccato, A. |
title |
Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
title_short |
Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
title_full |
Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
title_fullStr |
Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
title_full_unstemmed |
Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides) |
title_sort |
structural and metamorphic inheritance controls strain partitioning during orogenic shortening (kalak nappe complex, norwegian caledonides) |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://oro.open.ac.uk/70123/ https://oro.open.ac.uk/70123/1/70123.htm https://oro.open.ac.uk/70123/3/Ceccato_etal_%28KNC%29_revisedMS.pdf https://doi.org/10.1016/j.jsg.2020.104057 |
long_lat |
ENVELOPE(27.055,27.055,70.611,70.611) ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Kalak Norway Tilting |
geographic_facet |
Kalak Norway Tilting |
genre |
Finnmark Kvaløya Finnmark |
genre_facet |
Finnmark Kvaløya Finnmark |
op_relation |
https://oro.open.ac.uk/70123/1/70123.htm https://oro.open.ac.uk/70123/3/Ceccato_etal_%28KNC%29_revisedMS.pdf Ceccato, A.; Menegon, L.; Warren, C. J. <http://oro.open.ac.uk/view/person/cw6522.html> and Halton, A. M. <http://oro.open.ac.uk/view/person/amh656.html> (2020). Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides). Journal of Structural Geology, 136, article no. 104057. |
op_doi |
https://doi.org/10.1016/j.jsg.2020.104057 |
container_title |
Journal of Structural Geology |
container_volume |
136 |
container_start_page |
104057 |
_version_ |
1768386929536008192 |