Timing of Late Neoproterozoic glaciation on Baltica constrained by detrital zircon geochronology in the Hedmark Group, south‐east Norway

• Published in: Terra Nova
• Main Authors: Bingen, B., Griffin, W. L., Torsvik, T. H., Saeed, A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2005
• Subjects: Varanger
• Online Access: http://dx.doi.org/10.1111/j.1365-3121.2005.00609.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3121.2005.00609.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3121.2005.00609.x

Abstract The Moelv Tillite is the Late Neoproterozoic Varanger glacial deposit recorded in the Hedmark Group, SE Norway. Paired U–Pb and Lu–Hf data collected on detrital zircons in the Rendalen Formation underlying the Moelv Tillite have identified an uncommon 677 ± 15 to 620 ± 14 Ma population, that constrain the deposition of the Moelv Tillite to be younger than 620 ± 14 Ma. The youngest detrital zircons may be derived from granite magmatism related to the 616 ± 3 Ma Egersund dolerite magmatism, situated in the western part of the Sveconorwegian orogen. The Moelv Tillite, which is not overlain by a cap carbonate, possibly correlates with the c . 580 Ma Squantum‐Gaskiers glacial deposits of Avalonia. Available palaeomagnetic data for the Late Neoproterozoic suggest that Baltica was located at intermediate to high latitude between 620 and 555 Ma.