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首页> 外文期刊>Anais da Academia Brasileira de Ciências >Charcoal remains from a tonstein layer in the faxinal coalfield, lower Permian, Southern Paraná Basin, Brazil
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Charcoal remains from a tonstein layer in the faxinal coalfield, lower Permian, Southern Paraná Basin, Brazil

机译：巴西巴拉那盆地南部二叠纪下部二叠纪灰岩煤田中，吨岩层残留的木炭

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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.
机译：在巴西巴拉那盆地最南端的里奥博尼图组二叠纪早二叠纪的法基纳尔煤田中发现了化石木炭。描述了从单一的tonstein层中回收的3种类型的环氧丙稀裸子植物，它们证实了该地区古火的发生。碳纤维浓度在吨斯坦层中从底部到顶部降低，这表明在沉积过程中燃料量下降，可能是由于火烧掉了植被。吨煤层上方和下方的煤中均存在惰质岩，这表明着火事件不限于灰烬落落间隔。将当前研究中提供的新数据与以前发布的Faxinal Coalfield数据进行的整合表明，在周边地区发生的火山事件可以被识别为野火的一种潜在起火源。在不同地区，二叠纪沉积物中与木炭含量相关的木炭的存在表明，野火在形成巴拉那盆地的泥煤形成环境中是相对普遍的事件。

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