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oa Palaeomagnetism of the Palaeoproterozoic Rocks of the ∼2 Ga Novoukrainka and Buky Massifs of the Ukrainian Shield
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 17th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2023, Volume 2023, p.1 - 5
Abstract
New palaeomagnetic data on gabbro-monzonites of the Novoukrainka massif of the Volyn domain and monzonites, granodiorites and monzodiorites of the Buky massif of the Ingula domain are presented in order to obtain new time constraints for the Ukrainian Shield consolidation. Based on the results of temperature demagnetisation of studied rocks, low-temperature viscous, medium-temperature and high-temperature characteristic components were identified. Medium-temperature component is similar to the 1.76 Ga characteristic component of Korosten pluton basic rocks, which probably indicates a significant thermal impact on the Buky massif during of the formation of the main phase of rocks of the Korosten pluton 1.76 Gya. High-temperature characteristic component of magnetisation were identified for gabbro-monzonites of the Novoukrainka massif (2035±10 Ma) and for monzonites of Buky massif (1987±14 Ma). Calculated corresponding palaeomagnetic poles of Novoukrainka (Plat = 43.4°, Plon = 141.9°, dp/dm = 4.8/8.2°, N = 14) and Buky (Plat = 47.5°, Plon = 144.9°, dp/dm = 4.0/6.8°, N = 12) massifs agree well with the data obtained for the Proterozoic dykes with an age ∼2 Ga of the Volyn domain. According to new palaeomagnetic data, Volyn and Inhul domains did not experience significant movements relative to each other since at least ∼2 Gya, and developed within the unified structure of the Ukrainian Shield from that time.
