Timing of Late Neoproterozoic glaciation in Baltica constrained by detrital zircon geochronology in the Hedmark Group, south-east Norway
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 constra...
| Published in: | Terra Nova |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2005
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| Subjects: | |
| Online Access: | https://researchers.mq.edu.au/en/publications/8e35ed90-ddd4-4725-b73a-8709ce76c7da https://doi.org/10.1111/j.1365-3121.2005.00609.x http://www.scopus.com/inward/record.url?scp=20844439234&partnerID=8YFLogxK |
| Summary: | 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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