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标题：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
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作者：Dariusz Botor ; Tomasz Toboła ; Marta Waliczek 等
期刊名称：Acta geologica Polonica
印刷版ISSN：0001-5709
出版年度：2020
卷号：70
期号：3
页码：363-396
DOI：10.24425/agp.2019.126463
语种：English
出版社：Institute of Geology, University of Warsaw
摘要：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.
关键词：Raman spectroscopy;Vitrinite reflectance;Dispersed organic matter;Coalification;Lower Silesia Coal District;Bohemian Massif