@ARTICLE{Botor_Dariusz_Thermal_2020, author={Botor, Dariusz and Toboła, Tomasz and Waliczek, Marta}, volume={vol. 70}, number={No 3}, journal={Acta Geologica Polonica}, pages={363-396}, howpublished={online}, year={2020}, publisher={Komitet Nauk Geologicznych PAN}, publisher={Wydział Geologii UW}, abstract={Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.}, type={Article}, title={Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): A combined Raman spectroscopy and organic petrography study}, URL={http://journals.pan.pl/Content/110365/PDF/4_Botor.pdf}, doi={10.24425/agp.2019.126463}, keywords={Raman spectroscopy, vitrinite reflectance, Dispersed organic matter, Coalification, Lower Silesia Coal District, Bohemian Massif}, }