U–Pb dating of calcite in ancient carbonates for age estimates of syn- to post-depositional processes: a case study from the upper Ediacaran of Finnmark, Arctic Norway

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...

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Bibliographic Details
Published in:Geological Magazine
Main Authors: Meinhold, Guido, Roberts, Nick M W, Arslan, Arzu, Jensen, Sören, Ebbestad, Jan Ove R., Högström, Anette, Høyberget, Magne, Agic, Heda, Palacios, Teodoro, Taylor, Wendy L.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press 2020
Subjects:
VDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461
Arctic
Norway
Finnmark
Online Access:https://hdl.handle.net/10037/18625
https://doi.org/10.1017/S0016756820000564
Description
Summary: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.

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