Ewolucja stopnia uwęglenia utworów górnokarbońskich w obszarze górniczym »Janina« w Libiążu we wschodniej części Górnośląskiego Zagłębia Węglowego (GZW)
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Coalification history of the Upper Carboniferous sediments in the mining area »Janina« in Libiąż (eastern part of the Upper Silesian Coal Basin)
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Maturity modelling of the Upper Carboniferous sediments has been performed in order to explain the coalification history. Assuming 2000 m eroded overburden of the post-Stephanian sandstones paleoheat flow was 51 mW/m$^{2}$ in the latest Carboniferous time. The major coalification processes were likely occurred in the latest Carboniferous, and later a Mesozoic overprinting likely due to fluid migration was not significant for the organic matter maturity.