U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway
Results of in situ U–Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 ± 70...
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Cambridge University Press
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Online Access: | https://hdl.handle.net/10037/25571 https://doi.org/10.1017/S0016756820000564 |
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ftunivtroemsoe:oai:munin.uit.no:10037/25571 2023-05-15T14:26:41+02:00 U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway Meinhold, Guido Roberts, Nick M.W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. 2020-06-10 https://hdl.handle.net/10037/25571 https://doi.org/10.1017/S0016756820000564 eng eng Cambridge University Press Geological Magazine Meinhold, Roberts, Arslan, Jensen, Ebbestad, Högström A, Høyberget, Agić, Palacios, Taylor. U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway. Geological Magazine. 2020;157(8):1367-1372 FRIDAID 1889902 doi:10.1017/S0016756820000564 0016-7568 1469-5081 https://hdl.handle.net/10037/25571 openAccess Copyright 2020 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2020 ftunivtroemsoe https://doi.org/10.1017/S0016756820000564 2022-06-29T22:58:55Z Results of in situ U–Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 ± 70 Ma, which, although imprecise, is within uncertainty of the age of sedimentation based on fossil assemblages. Non-deformed CIC calcite from the bottom part of the concretion yielded an age of 475 ± 25 Ma, which is interpreted as the age of CIC calcite formation during a period of fluid overpressure induced during burial of the sediments. Deformed CIC calcite from the top part of the concretion yielded an age of 418 ± 23 Ma, which overlaps with a known Caledonian tectono-metamorphic event, and indicates a potential post-depositional overprint at this time. Calcite fibres that grew in small fissures along spherulite rims, which are interpreted as a recrystallization feature during deformation and formation of a cleavage, gave an imprecise age of 486 ± 161 Ma. Our results show that U–Pb dating of calcite can provide age constraints for ancient carbonates and syn- to post-depositional processes that operated during burial and metamorphic overprinting. Article in Journal/Newspaper Arctic Arctic Finnmark Finnmark University of Tromsø: Munin Open Research Archive Arctic Norway Geological Magazine 157 8 1367 1372 |
institution |
Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
Results of in situ U–Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 ± 70 Ma, which, although imprecise, is within uncertainty of the age of sedimentation based on fossil assemblages. Non-deformed CIC calcite from the bottom part of the concretion yielded an age of 475 ± 25 Ma, which is interpreted as the age of CIC calcite formation during a period of fluid overpressure induced during burial of the sediments. Deformed CIC calcite from the top part of the concretion yielded an age of 418 ± 23 Ma, which overlaps with a known Caledonian tectono-metamorphic event, and indicates a potential post-depositional overprint at this time. Calcite fibres that grew in small fissures along spherulite rims, which are interpreted as a recrystallization feature during deformation and formation of a cleavage, gave an imprecise age of 486 ± 161 Ma. Our results show that U–Pb dating of calcite can provide age constraints for ancient carbonates and syn- to post-depositional processes that operated during burial and metamorphic overprinting. |
format |
Article in Journal/Newspaper |
author |
Meinhold, Guido Roberts, Nick M.W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. |
spellingShingle |
Meinhold, Guido Roberts, Nick M.W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
author_facet |
Meinhold, Guido Roberts, Nick M.W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. |
author_sort |
Meinhold, Guido |
title |
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
title_short |
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
title_full |
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
title_fullStr |
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
title_full_unstemmed |
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway |
title_sort |
u-pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: a case study from the upper ediacaran strata of finnmark, arctic norway |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://hdl.handle.net/10037/25571 https://doi.org/10.1017/S0016756820000564 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Arctic Finnmark Finnmark |
genre_facet |
Arctic Arctic Finnmark Finnmark |
op_relation |
Geological Magazine Meinhold, Roberts, Arslan, Jensen, Ebbestad, Högström A, Høyberget, Agić, Palacios, Taylor. U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway. Geological Magazine. 2020;157(8):1367-1372 FRIDAID 1889902 doi:10.1017/S0016756820000564 0016-7568 1469-5081 https://hdl.handle.net/10037/25571 |
op_rights |
openAccess Copyright 2020 The Author(s) |
op_doi |
https://doi.org/10.1017/S0016756820000564 |
container_title |
Geological Magazine |
container_volume |
157 |
container_issue |
8 |
container_start_page |
1367 |
op_container_end_page |
1372 |
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1766299983204581376 |