Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Botor, D.

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Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

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Botor D.

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In the present study, the thermal history of the Late Carboniferous (Stephanian) coal-bearing sediments of the Sabero Coalfield has been reconstructed in order to elucidate coal rank. The Sabero Coalfield is located in a small intramontane coal-bearing basin along the Sabero-Gordón fault zone, one of the major E-W trending strike-slip fault systems of the southern part of the Cantabrian Zone (NW Spain). The total thickness of the Stephanian succession is in excess of 2,000 m, and is composed of siliclastic rocks and intercalated coal seams with tonsteins. Mean vitrinite reflectance values in the Stephanian rocks in the Sabero Coalfield are in the range from 0.61 to 3.14% Rr, but most values are in the range from 0.8 to 1.5% Rr (based on 84 samples). Average vitrinite reflectance gradient is high (0.73% Rr/km), which suggests high value of average paleogeothermal gradient (52°C/km). The maximum paleotemperatures calculated from vitrinite reflectance values for the Stephanian rocks range between 89°C (top of the Stephanian) and 195°C (bottom of the Stephanian). Coalification of the organic matter in the Stephanian rocks was achieved in the Early Permian, and was most likely related to several almost simultaneous related to magmatic and hydrothermal activity during high subsidence period in the pull-apart basin. The primary, burial-related maturity pattern, was probably slightly overprinted by fluid migration event, which is supposed to have occurred in Early Permian time.

Słowa kluczowe

Spain Cantabrian Mountains Sabero coalfield Carboniferous pull-apart basin coalification thermal history maturity modelling vitrinite reflectance eroded overburden

Wydawca

Wydawnictwa AGH

Czasopismo

Geology, Geophysics and Environment

Rocznik

2012

Tom

Vol. 38, no. 4

Strony

369--393

Opis fizyczny

Bibliogr. 90 poz., rys., tab., wykr.

Twórcy

autor

Botor D.

botor@agh.edu.pl

AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Department of Economic and Mining Geology; al. Mickiewicza 30, 30-059 Krakow, Poland

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