Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway
New organic-walled microfossil (OWM) assemblages are reported from upper Neoproterozoic glacial and interglacial siliciclastic deposits in Finnmark, northern Norway. A nearly continuous sedimentary succession of the Vestertana Group contains two glaciogenic units, the Smalfjorden and Mortensnes form...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hdl.handle.net/10037/32340 https://doi.org/10.1016/j.palaeo.2023.111956 |
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ftunivtroemsoe:oai:munin.uit.no:10037/32340 2024-02-04T10:00:24+01:00 Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway Agic, Heda Jensen, Sören Meinhold, Guido Högström, Anette Elisabeth Sofi Ebbestad, Jan Ove R. Høyberget, Magne Palacios, Teodoro Taylor, Wendy L. 2023-12-05 https://hdl.handle.net/10037/32340 https://doi.org/10.1016/j.palaeo.2023.111956 eng eng Elsevier Palaeogeography, Palaeoclimatology, Palaeoecology Norges forskningsråd: 231103 Agic H, Jensen S, Meinhold G, Högström A, Ebbestad JOR, Høyberget M, Palacios T, Taylor WL. Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway. Palaeogeography, Palaeoclimatology, Palaeoecology. 2023;635 FRIDAID 2212765 https://doi.org/10.1016/j.palaeo.2023.111956 0031-0182 1872-616X https://hdl.handle.net/10037/32340 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.1016/j.palaeo.2023.111956 2024-01-11T00:08:07Z New organic-walled microfossil (OWM) assemblages are reported from upper Neoproterozoic glacial and interglacial siliciclastic deposits in Finnmark, northern Norway. A nearly continuous sedimentary succession of the Vestertana Group contains two glaciogenic units, the Smalfjorden and Mortensnes formations, interpreted as end-Cryogenian Marinoan and Ediacaran glaciations, respectively. We investigated the OWM record in the Nyborg, Mortensnes, and Stáhpogieddi formations to assess the impact of a glacial interval on the diversity of microscopic eukaryotes. A modified acid-extraction technique was applied to recover OWM from the diamictite matrix. The upper Nyborg Formation contains morphologically complex Doushantuo-Pertatataka acritarchs (DPA), restricting the age of the Nyborg Formation to early-mid Ediacaran. DPA occur below the dolostones that record a negative carbon isotope excursion correlated with the Shuram anomaly and below a glacial diamictite. A decline in species richness and compositional change is observed in the Mortensnes glacial assemblage. DPA are replaced by bacterial filaments and cell aggregates. The overlying Indreelva Member, Stáhpogieddi Formation contains Ediacara-type biota and palaeopascichnids, but only a depauperate OWM assemblage of leiosphaerids and flask-shaped microfossils characteristic of the late Ediacaran. The succession of assemblages in the Vestertana Group demonstrates a turnover from large eukaryotic OWM to a microbial community in the glacial interval, to a low diversity post-glacial assemblage during the rise of macroscopic life. We compared the Vestertana record to global DPA occurrences. Although one DPA assemblage zone postdates the Shuram excursion, no DPA occur above Ediacaran glacial diamictites in successions where those deposits are present. Considering this, and the community changes in the Vestertana succession, we suggest that DPA were affected by the onset of an Ediacaran glaciation. Lastly, we combined the biostratigraphic markers in the Vestertana Group to ... Article in Journal/Newspaper Finnmark Northern Norway Finnmark University of Tromsø: Munin Open Research Archive Indreelva ENVELOPE(19.187,19.187,69.957,69.957) Mortensnes ENVELOPE(20.269,20.269,69.581,69.581) Norway Stáhpogieddi ENVELOPE(28.018,28.018,70.543,70.543) Tanafjorden ENVELOPE(28.391,28.391,70.747,70.747) Vestertana ENVELOPE(27.868,27.868,70.424,70.424) Palaeogeography, Palaeoclimatology, Palaeoecology 635 111956 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
New organic-walled microfossil (OWM) assemblages are reported from upper Neoproterozoic glacial and interglacial siliciclastic deposits in Finnmark, northern Norway. A nearly continuous sedimentary succession of the Vestertana Group contains two glaciogenic units, the Smalfjorden and Mortensnes formations, interpreted as end-Cryogenian Marinoan and Ediacaran glaciations, respectively. We investigated the OWM record in the Nyborg, Mortensnes, and Stáhpogieddi formations to assess the impact of a glacial interval on the diversity of microscopic eukaryotes. A modified acid-extraction technique was applied to recover OWM from the diamictite matrix. The upper Nyborg Formation contains morphologically complex Doushantuo-Pertatataka acritarchs (DPA), restricting the age of the Nyborg Formation to early-mid Ediacaran. DPA occur below the dolostones that record a negative carbon isotope excursion correlated with the Shuram anomaly and below a glacial diamictite. A decline in species richness and compositional change is observed in the Mortensnes glacial assemblage. DPA are replaced by bacterial filaments and cell aggregates. The overlying Indreelva Member, Stáhpogieddi Formation contains Ediacara-type biota and palaeopascichnids, but only a depauperate OWM assemblage of leiosphaerids and flask-shaped microfossils characteristic of the late Ediacaran. The succession of assemblages in the Vestertana Group demonstrates a turnover from large eukaryotic OWM to a microbial community in the glacial interval, to a low diversity post-glacial assemblage during the rise of macroscopic life. We compared the Vestertana record to global DPA occurrences. Although one DPA assemblage zone postdates the Shuram excursion, no DPA occur above Ediacaran glacial diamictites in successions where those deposits are present. Considering this, and the community changes in the Vestertana succession, we suggest that DPA were affected by the onset of an Ediacaran glaciation. Lastly, we combined the biostratigraphic markers in the Vestertana Group to ... |
format |
Article in Journal/Newspaper |
author |
Agic, Heda Jensen, Sören Meinhold, Guido Högström, Anette Elisabeth Sofi Ebbestad, Jan Ove R. Høyberget, Magne Palacios, Teodoro Taylor, Wendy L. |
spellingShingle |
Agic, Heda Jensen, Sören Meinhold, Guido Högström, Anette Elisabeth Sofi Ebbestad, Jan Ove R. Høyberget, Magne Palacios, Teodoro Taylor, Wendy L. Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
author_facet |
Agic, Heda Jensen, Sören Meinhold, Guido Högström, Anette Elisabeth Sofi Ebbestad, Jan Ove R. Høyberget, Magne Palacios, Teodoro Taylor, Wendy L. |
author_sort |
Agic, Heda |
title |
Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
title_short |
Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
title_full |
Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
title_fullStr |
Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
title_full_unstemmed |
Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway |
title_sort |
life through an ediacaran glaciation: shale- and diamictite-hosted organic-walled microfossil assemblages from the late neoproterozoic of the tanafjorden area, northern norway |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/32340 https://doi.org/10.1016/j.palaeo.2023.111956 |
long_lat |
ENVELOPE(19.187,19.187,69.957,69.957) ENVELOPE(20.269,20.269,69.581,69.581) ENVELOPE(28.018,28.018,70.543,70.543) ENVELOPE(28.391,28.391,70.747,70.747) ENVELOPE(27.868,27.868,70.424,70.424) |
geographic |
Indreelva Mortensnes Norway Stáhpogieddi Tanafjorden Vestertana |
geographic_facet |
Indreelva Mortensnes Norway Stáhpogieddi Tanafjorden Vestertana |
genre |
Finnmark Northern Norway Finnmark |
genre_facet |
Finnmark Northern Norway Finnmark |
op_relation |
Palaeogeography, Palaeoclimatology, Palaeoecology Norges forskningsråd: 231103 Agic H, Jensen S, Meinhold G, Högström A, Ebbestad JOR, Høyberget M, Palacios T, Taylor WL. Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway. Palaeogeography, Palaeoclimatology, Palaeoecology. 2023;635 FRIDAID 2212765 https://doi.org/10.1016/j.palaeo.2023.111956 0031-0182 1872-616X https://hdl.handle.net/10037/32340 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1016/j.palaeo.2023.111956 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
635 |
container_start_page |
111956 |
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1789965666095202304 |