The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age.
A number of discrete slate belts of limited size occur in the Paleoproterozoic volcano-sedimentary Bergslagen Group of western Bergslagen in the Fennoscandian shield of south central Sweden. The Grythyttan Slate Belt, studied for more than a century, forms a single basin with the nearby Saxån Slate...
Published in: | Norwegian Journal of Geology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://research.vu.nl/en/publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 https://doi.org/10.17850/njg98-3-05 https://hdl.handle.net/1871.1/10783cda-5b9a-49c8-a30a-b389c9f8bf59 |
id |
ftvuamstcris:oai:research.vu.nl:publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 |
---|---|
record_format |
openpolar |
spelling |
ftvuamstcris:oai:research.vu.nl:publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 2024-09-15T18:06:05+00:00 The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. Beunk, F.F. Kuipers, Gerrit Yi, Keewook van der Wateren, Frederik 2018 https://research.vu.nl/en/publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 https://doi.org/10.17850/njg98-3-05 https://hdl.handle.net/1871.1/10783cda-5b9a-49c8-a30a-b389c9f8bf59 eng eng https://research.vu.nl/en/publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 info:eu-repo/semantics/openAccess Beunk , F F , Kuipers , G , Yi , K & van der Wateren , F 2018 , ' The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. ' , Norwegian Journal of Geology , vol. 98 , no. 3 , pp. 33-57 . https://doi.org/10.17850/njg98-3-05 Paleoproterozoic structure stratigraphy geochronology Bergslagen Sweden /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2018 ftvuamstcris https://doi.org/10.17850/njg98-3-05 2024-07-03T23:47:27Z A number of discrete slate belts of limited size occur in the Paleoproterozoic volcano-sedimentary Bergslagen Group of western Bergslagen in the Fennoscandian shield of south central Sweden. The Grythyttan Slate Belt, studied for more than a century, forms a single basin with the nearby Saxån Slate Belt. We use the lithostratigraphy of the Grythyttan Slate Formation of the Grythyttan belt, based on basin scale sedimentary facies associations of the volcaniclastic sediments in time and space, as a method to interpret overall tectonic structure. Contrary to traditional views, we reconstruct the GSB as a single overturned limb of a km-scale anticline with horizontal axis in the hanging wall of an east vergent thrust fault, reactivating a listric extensional fault. The fold connects the GSB to the neighboring SSB. Folding and thrusting were related to tectonic closure of a volcanic back- or intra-arc basin. The early folds were subsequently affected by strike-slip shearing and folding around vertical fold axes, which partitioned preferentially into the least competent lithologies (slates and marbles), significantly modifying the map appearance of the slate belt. The late shearing and folding resulted from accretion of Bergslagen onto the Fennoscandian continental margin during the late, Svecobaltic phase of the Svecofennian orogeny. The GSB forms a thin, intraformational wedge in the Bergslagen Group and represents a relatively short interlude with a conglomeratic alluvial fan and turbiditic volcaniclastics followed by more felsic volcanic rocks resembling those of the Bergslagen Group. We suggest that the GSB, and by inference the other slate belts, stem from calderas, as either terrestrial volcanic lakes or shallow submarine eruption centers. The conglomerates are pre-orogenic, not a post-orogenic molasse, as traditionally conceived, and their clast fabric has resulted from sedimentary processes only. Newly determined SIMS U-Pb zircon ages constrain the age of the GSB at ca. 1895 Ma. Article in Journal/Newspaper Fennoscandian Vrije Universiteit Amsterdam (VU): Research Portal Norwegian Journal of Geology |
institution |
Open Polar |
collection |
Vrije Universiteit Amsterdam (VU): Research Portal |
op_collection_id |
ftvuamstcris |
language |
English |
topic |
Paleoproterozoic structure stratigraphy geochronology Bergslagen Sweden /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Paleoproterozoic structure stratigraphy geochronology Bergslagen Sweden /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Beunk, F.F. Kuipers, Gerrit Yi, Keewook van der Wateren, Frederik The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
topic_facet |
Paleoproterozoic structure stratigraphy geochronology Bergslagen Sweden /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
A number of discrete slate belts of limited size occur in the Paleoproterozoic volcano-sedimentary Bergslagen Group of western Bergslagen in the Fennoscandian shield of south central Sweden. The Grythyttan Slate Belt, studied for more than a century, forms a single basin with the nearby Saxån Slate Belt. We use the lithostratigraphy of the Grythyttan Slate Formation of the Grythyttan belt, based on basin scale sedimentary facies associations of the volcaniclastic sediments in time and space, as a method to interpret overall tectonic structure. Contrary to traditional views, we reconstruct the GSB as a single overturned limb of a km-scale anticline with horizontal axis in the hanging wall of an east vergent thrust fault, reactivating a listric extensional fault. The fold connects the GSB to the neighboring SSB. Folding and thrusting were related to tectonic closure of a volcanic back- or intra-arc basin. The early folds were subsequently affected by strike-slip shearing and folding around vertical fold axes, which partitioned preferentially into the least competent lithologies (slates and marbles), significantly modifying the map appearance of the slate belt. The late shearing and folding resulted from accretion of Bergslagen onto the Fennoscandian continental margin during the late, Svecobaltic phase of the Svecofennian orogeny. The GSB forms a thin, intraformational wedge in the Bergslagen Group and represents a relatively short interlude with a conglomeratic alluvial fan and turbiditic volcaniclastics followed by more felsic volcanic rocks resembling those of the Bergslagen Group. We suggest that the GSB, and by inference the other slate belts, stem from calderas, as either terrestrial volcanic lakes or shallow submarine eruption centers. The conglomerates are pre-orogenic, not a post-orogenic molasse, as traditionally conceived, and their clast fabric has resulted from sedimentary processes only. Newly determined SIMS U-Pb zircon ages constrain the age of the GSB at ca. 1895 Ma. |
format |
Article in Journal/Newspaper |
author |
Beunk, F.F. Kuipers, Gerrit Yi, Keewook van der Wateren, Frederik |
author_facet |
Beunk, F.F. Kuipers, Gerrit Yi, Keewook van der Wateren, Frederik |
author_sort |
Beunk, F.F. |
title |
The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
title_short |
The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
title_full |
The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
title_fullStr |
The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
title_full_unstemmed |
The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. |
title_sort |
paleoproterozoic grythyttan field in the svecofennian orogen, west bergslagen, central sweden: structure, stratigraphy and age. |
publishDate |
2018 |
url |
https://research.vu.nl/en/publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 https://doi.org/10.17850/njg98-3-05 https://hdl.handle.net/1871.1/10783cda-5b9a-49c8-a30a-b389c9f8bf59 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Beunk , F F , Kuipers , G , Yi , K & van der Wateren , F 2018 , ' The Paleoproterozoic Grythyttan Field in the Svecofennian Orogen, West Bergslagen, Central Sweden: Structure, Stratigraphy and Age. ' , Norwegian Journal of Geology , vol. 98 , no. 3 , pp. 33-57 . https://doi.org/10.17850/njg98-3-05 |
op_relation |
https://research.vu.nl/en/publications/10783cda-5b9a-49c8-a30a-b389c9f8bf59 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.17850/njg98-3-05 |
container_title |
Norwegian Journal of Geology |
_version_ |
1810443587617292288 |