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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

Permanent lenke
https://hdl.handle.net/10037/25571
DOI
https://doi.org/10.1017/S0016756820000564
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article.pdf (920.7Kb)
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Dato
2020-06-10
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
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.
Sammendrag
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.
Forlag
Cambridge University Press
Sitering
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
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Copyright 2020 The Author(s)

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