Meinhold, G, Roberts, NMW, Arslan, A, Jensen, S, Ebbestad, JOR, Högström, AES, Høyberget, M, Agić, H, Palacios, T and Taylor, WL (2020) 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, 57 (8). pp. 1367-1372. ISSN 0016-7568

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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 postdepositional processes that operated during burial and metamorphic overprinting.

Item Type: Article
Additional Information: The final accepted manuscript and all relevant information regarding this article can be found at;
Uncontrolled Keywords: U–Pb calcite geochronology; calcite spherulites; cone-in-cone calcite; Ediacaran; Caledonides; Norway
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Depositing User: Symplectic
Date Deposited: 17 Jun 2020 12:45
Last Modified: 10 Dec 2020 01:30

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