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Age of the Sääksjärvi impact structure, Finland: reconciling the timing of small impacts in crystalline basement with regional basin development
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0001-8683-3860
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2020 (English)In: Journal of the Geological Society, ISSN 0016-7649, E-ISSN 2041-479X, Vol. 177, p. 1231-1243Article in journal (Refereed) Published
Abstract [en]

We report a new age for the Sääksjärvi impact structure, Finland, a 6 km diameter feature that formed in crystalline rocks of the Precambrian Baltic Shield. Two previous studies reported 40Ar/39Ar data for Sääksjärvi and suggested conflicting formation ages of ≤330 Ma or c. 560 Ma. The former age represents a possible complication for models which indicate that the region was covered by sediments of the Caledonian foreland basin throughout much of the Phanerozoic. We conducted a study combining imaging, microstructural analysis and U–Pb dating of shocked zircon from Sääksjärvi. The U–Pb dataset indicates a c. 600 Ma impact into predominantly c. 1850 Ma target rocks. A concordia age of 608 ± 8 Ma (2σ) confirms Sääksjärvi as the first known Ediacaran impact structure in the Baltic Shield and only the second worldwide. Our data indicate that the Sääksjärvi impact structure formed in exposed crystalline basement rocks of the Baltic Shield prior to the development of the Caledonian foreland basin. Given that most impact structures on Earth are relatively small features, radiometric dating of small impact structures in crystalline basement may place boundaries on the timing and spatial extent of palaeobasins that might otherwise be difficult to constrain.

Place, publisher, year, edition, pages
2020. Vol. 177, p. 1231-1243
National Category
Geosciences, Multidisciplinary
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3884DOI: 10.1144/jgs2020-034OAI: oai:DiVA.org:nrm-3884DiVA, id: diva2:1505987
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EU, Horizon 2020, 792030Available from: 2020-12-02 Created: 2020-12-02 Last updated: 2020-12-02Bibliographically approved

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Kenny, GavinWhitehouse, MartinBellucci, JeremyMerle, Renaud
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