Timing of Late Neoproterozoic glaciation on Baltica constrained by detrital zircon geochronology in the Hedmark Group, south-east Norway |
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| Authors: | B Bingen W L Griffin T H Torsvik A Saeed |
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| Institution: | Geological Survey of Norway, 7491 Trondheim, Norway;;Department of Earth and Planetary Sciences, GEMOC ARC National Key Centre, Macquarie University, NSW 2109, Australia;;CSIRO Exploration and Mining, North Ryde, NSW 2113, Australia;;Institute for Petroleum Technology and Applied Geophysics, NTNU, 7491 Trondheim, Norway;;School of Geosciences, University of the Witwatersrand, Private Bag 3, PO WITS 2050, Johannesburg, South Africa |
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| 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. |
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