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Life through an Ediacaran glaciation: Shale- and diamictite-hosted organic-walled microfossil assemblages from the late Neoproterozoic of the Tanafjorden area, northern Norway
Univ Durham, Dept Earth Sci, Durham, England..
Univ Extremadura, Fac Ciencias, Area Paleontol, Badajoz, Spain..
TU Bergakad Freiberg, Inst Geol, Freiberg, Germany.;Univ Gottingen, Dept Sedimentol & Environm Geol, Gottingen, Germany..
Arctic Univ Museum Norway, UiT The Arctic Univ Norway, Tromso, Norway..
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2024 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 635, article id 111956Article in journal (Refereed) Published
Abstract [en]

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 St ' ahpogieddi 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, St ' ahpogieddi 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 constrain the age of the Mortensnes diamictite.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 635, article id 111956
Keywords [en]
Organic-walled microfossils, Neoproterozoic, Ediacaran, Diamictite, Biostratigraphy, Palynological acid maceration
National Category
Geology Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-523232DOI: 10.1016/j.palaeo.2023.111956ISI: 001140581900001OAI: oai:DiVA.org:uu-523232DiVA, id: diva2:1838732
Part of project
Ecology and evolution of early eukaryotes in the Neoproterozoic: microstructural and geochemical investigation, Swedish Research Council
Funder
Swedish Research Council, VR2016-06810Available from: 2024-02-19 Created: 2024-02-19 Last updated: 2024-02-19Bibliographically approved

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Ebbestad, Jan Ove R.

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