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From magnetic domains to geologic terranes: paleomagnetism, geotectonics and some earth science problems
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 17th International Conference on Geoinformatics - Theoretical and Applied Aspects, May 2018, Volume 2018, p.1 - 6
Abstract
Paleomagnetic data are the main source of information for global paleotectonic reconstructions representing horizontal movements of the crustal blocks. Reliability and quantity of paleomagnetic data as well as uniformity of their distribution within the apparent polar wander path (APWP) determine accuracy of paleotectonic reconstructions that significantly depends on the APWP quality. This shows the importance of obtaining new reliable paleomagnetic data. In this paper summarizes the investigation of rocks of the Inghul megablock of Ukrainian Shield (US) resulting in paleomagnetic poles for 1750, 1770 and 2037 Ma were obtained. Based on the available paleomagnetic poles, the kinematic parameters for the US (Ingul and North-West megablocks) and Fennoscandia were calculated. In addition, the results of studying the rocks of the Ediacaran traps and also the parameters of corresponding paleomagnetic poles for 580 and 561 Ma were presented. Also, there is presented a study of the sedimentary rocks of Podolia, which made it possible to clarify the Ordovician-Silurian APWP part for the Baltica, make a kinematic assessment of the Baltica in the Middle Paleozoic and carry out the paleotectonic reconstruction. The last study relate to the refinement of the Pangea configuration in the Permian-Triassic period, resulting in paleomagnetic determinations for andesite and trachyte dike complexes in the eastern part of the US (with an estimated age of 210 and 280 million years) were calculated. An analysis of the gathered data showed that the alternative model of Pangea (Pangea-B) based on a mega-shear of some 3500 km between Gondwana and Laurasia is unnecessary.