Charcoal remains from a tonstein layer in the Faxinal Coalfield, Lower Permian, southern Paraná Basin, Brazil

Anais da Academia Brasileira de Ciências

André Jasper²  Dieter Uhl¹  Margot Guerra-sommer¹  Abdalla M. B Abu Hamad¹  Neli T. G Machado² 

[1] ,Centro Universitário UNIVATES Programa de Pós-Graduação em Ambiente e Desenvolvimento Lajeado RS ,Brasil

关键词: charcoal;    gymnosperms;    volcanic ashes;    coal deposits;    Gondwana;    Late Palaeozoic;    charcoal;    gimnospermas;    cinzas vulcânicas;    depósitos de carvão;    Gondwana;    Paleozóico Superior;   

DOI  :  10.1590/S0001-37652011000200009

来源: SciELO

【 摘 要 】

Fossil charcoal has been discovered in the Faxinal Coalfield, Early Permian, Rio Bonito Formation, in the southernmost portion of the Paraná Basin, Brazil. Three types of pycnoxylic gymnosperm woods recovered from a single tonstein layer are described and confirm the occurrence of paleowildfire in this area. A decrease of the charcoal concentration from the base to the top within the tonstein layer indicates that the amount of fuel declined during the deposition probably due to the consumption of vegetation by the fire. The presence of inertinite in coals overlying and underlying the tonstein layer indicates that fire-events were not restricted to the ash fall interval. The integration of the new data presented in the current study with previously published data for the Faxinal Coalfield demonstrates that volcanic events that occurred in the surrounding areas can be identified as one potential source of ignition for the wildfires. The presence of charcoal in Permian sediments associated with coal levels at different localities demonstrates that wildfires have been relatively common events in the peat-forming environments in which the coal formation took place in the Paraná Basin.

【 授权许可】

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