Thermal history of the East European Platform margin in Poland based on apatite and zircon low-temperature thermochronology

Abstract. The Phanerozoic tectonothermal evolution of the SW slope East European Platform (EEP) in Poland is reconstructed by means thermal maturity, low-temperature thermochronometry, and modelling. We provide a set new thermochronometric data integrate stratigraphic maturity information to constrain burial history sediments. Apatite fission track (AFT) analysis zircon (U-Th)/He (ZHe) thermochronology have been carried out on samples sandstones, bentonites, diabase, crystalline basement rocks collected from 17 boreholes located central NE Poland. They penetrated sedimentary cover EEP subdivided north south into Baltic, Podlasie, Lublin basins. average ZHe ages Proterozoic as well Ordovician Silurian bentonites Cambrian lower Carboniferous sandstones range 848 ± 81 255 22 Ma with single early Permian age 288 Ma, corresponding cooling after event. remaining represent partial reset or source ages. AFT are dispersed 235.8 17.3 (Middle Triassic) 42.1 11.1 (Paleogene) providing record Mesozoic Cenozoic cooling. highest frequency Jurassic Early Cretaceous prior Alpine basin inversion. Thermal results consistent SW-ward increase Paleozoic sediments thickness. An important break profile exists across base Permian–Mesozoic unconformity. modelling showed that significant heating Ediacaran successions occurred before maximum paleotemperatures earliest latest for Baltic–Podlasie basins, respectively. obtained suggest an role uplift exhumation at margin EEP. latter was afterward overridden Basin Variscan orogenic wedge. Its tectonic loading interrupted caused resumption sedimentation late Viséan. Consequently, different Podlasie Baltic basins but similar other sections foreland, characterized end Carboniferous. gradual peak temperatures transition Triassic due decreasing heat flow. Burial part study area, where covered extensive pile. However, further NE, low shallow burial, impact fluids can be detected vitrinite reflectance, illite/smectite, thermochronological data. Our emphasize importance using multiple thermochronometers connection elucidate near-surface platform margins.