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Sudety w kenozoiku : od tektonicznej ekshumacji podłoża do współczesnej rzeźby – wnioski z termochronologii niskotemperaturowej

Sobczyk Artur

Przegląd Geologiczny

2025

Vol. 73, nr 9

804--812

Low-temperature the rmochronology based on apatite and zircon (40-240°C) provides essential infor¬mation on the evolution of the Sudetes during the Mesozoic and Cenozoic. AFT data from various areas of the Sudetes indicate intense cooling and basement exhumation during the Late Cretaceous-Paleogene (~90-45 Ma). The estimated mean exhumation rate during this period varied between 1.0 and 0.04 km/Ma. In the Cenozoic, there was a significant slowdown in tectonic processes and a decrease in the exhumation rate to <0.01 km/Ma. Results from numerical modelling of AFT data suggest that the folding of Cretaceous sediments in the lntra-Sudetic Synclinorium and the Upper Nysa Kłodzka Graben took place between 75 and 70 Ma. Thermochronology has also provided evidence of deep burial of the Sudetes in the Late Cretaceous, with the observed thermal reset suggesting that the thickness of the sedimentary cover may have reached up to 6 km. The development of the Sudetic landscape into a form similar to the present one did not occur earlier than after the Eocene, when the last phase of basement rock cooling and associated denudation of the Me¬ta-Carpathian Swell was recorded. The final uplift of the Sudetic Block began in the Middle Miocene (15±5 Ma), and the total erosion over the past 90 million years reached 5-6 km.