TY - JOUR N2 - 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. L1 - http://journals.pan.pl/Content/110365/PDF/4_Botor.pdf L2 - http://journals.pan.pl/Content/110365 PY - 2020 IS - No 3 EP - 396 DO - 10.24425/agp.2019.126463 KW - Raman spectroscopy KW - vitrinite reflectance KW - Dispersed organic matter KW - Coalification KW - Lower Silesia Coal District KW - Bohemian Massif A1 - Botor, Dariusz A1 - Toboła, Tomasz A1 - Waliczek, Marta PB - Komitet Nauk Geologicznych PAN PB - Wydział Geologii UW VL - vol. 70 DA - 2020.09.21 T1 - 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 SP - 363 UR - http://journals.pan.pl/dlibra/publication/edition/110365 T2 - Acta Geologica Polonica ER -