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
Abstract 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...
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2020
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/133587 2023-11-05T03:39:23+01:00 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 E. S. Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. Meinhold, Guido Roberts, Nick M. W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette E. S. Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. 2020 https://resolver.sub.uni-goettingen.de/purl?gro-2/133587 https://doi.org/10.1017/S0016756820000564 en eng https://resolver.sub.uni-goettingen.de/purl?gro-2/133587 doi:10.1017/S0016756820000564 S0016756820000564 info:eu-repo/semantics/openAccess info:eu-repo/semantics/article journal_article yes 2020 ftsubgoettingen https://doi.org/10.1017/S0016756820000564 2023-10-08T16:57:55Z Abstract 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 Finnmark Finnmark Georg-August-Universität Göttingen: GoeScholar Geological Magazine 157 8 1367 1372 |
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Open Polar |
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Georg-August-Universität Göttingen: GoeScholar |
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ftsubgoettingen |
language |
English |
description |
Abstract 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. |
author2 |
Meinhold, Guido Roberts, Nick M. W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette E. S. Høyberget, Magne Agić, Heda Palacios, Teodoro Taylor, Wendy L. |
format |
Article in Journal/Newspaper |
author |
Meinhold, Guido Roberts, Nick M. W. Arslan, Arzu Jensen, Sören Ebbestad, Jan Ove R. Högström, Anette E. S. 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 E. S. 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 E. S. 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 |
publishDate |
2020 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133587 https://doi.org/10.1017/S0016756820000564 |
genre |
Arctic Finnmark Finnmark |
genre_facet |
Arctic Finnmark Finnmark |
op_relation |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133587 doi:10.1017/S0016756820000564 S0016756820000564 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1781695205967134720 |