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Contribuição para a melhoria da cartografia geológica da Bacia Carbonífera do Buçaco
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Abstract(s)
RESUMO: A revisão da cartografia geológica da área onde se situa a Bacia Carbonífera do Buçaco (BCB) mostrou que os seus limites se encontram ou fortemente tectonizados ou em discordância angular sobre litologias neoproterozóicas e paleozóicas. Os sedimentos mesocenozóicos cartografados também estabelecem limites com as unidades da BCB. No limite oriental da bacia foi identificada uma falha normal gerada em regime distensivo, ativa durante a deposição das unidades litoestratigráficas datadas do Gzheliano, enquanto no limite ocidental foi identificada uma tectónica compressiva tangencial (direção ENE-WSW), com transporte de material para ENE, posterior ao evento extensional. Os episódios tectónicos descritos estão associados às fases finais da Orogenia Varisca.
ABSTRACT: The geological cartography review of the area where the Bussaco Carboniferous Basin (BCB) is located showed that its limits are either strongly tectonized or in angular discordance over Neoproterozoic and Paleozoic lithology’s. Mapped mesocenozoic sediments also settle limits with the BCB units. At the eastern limit of the basin, a normal fault generated in an extensional regime was identified, active during the deposition of lithostratigraphic units dated from the Gzhelian, while on the western boundary, a tangential compressive tectonic was identified (ENE-WSW direction), with material transport to ENE, posterior to the extensional tectonic event. The described tectonic episodes are associated with the final stages of the Variscan Orogeny.
ABSTRACT: The geological cartography review of the area where the Bussaco Carboniferous Basin (BCB) is located showed that its limits are either strongly tectonized or in angular discordance over Neoproterozoic and Paleozoic lithology’s. Mapped mesocenozoic sediments also settle limits with the BCB units. At the eastern limit of the basin, a normal fault generated in an extensional regime was identified, active during the deposition of lithostratigraphic units dated from the Gzhelian, while on the western boundary, a tangential compressive tectonic was identified (ENE-WSW direction), with material transport to ENE, posterior to the extensional tectonic event. The described tectonic episodes are associated with the final stages of the Variscan Orogeny.
Description
Keywords
Bacia Carbonífera do Buçaco Cartografia geológica Estrutura Limites litoestratigráficos Limites tectónicos Bussaco Carboniferous Basin Geological mapping Structure Lithostratigraphic limits Limits tectonics
Pedagogical Context
Citation
Ferreira, P.A. & Romão, J.M. (2025). Contribuição para a melhoria da cartografia geológica da Bacia Carbonífera do Buçaco. In: Comunicações Geológicas, 2025, vol.112, Fascículo Especial I, pp. 355-358. https://doi.org/10.34637/k4re-pj09
Publisher
LNEG - Laboratório Nacional de Energia e Geologia