Evidence of wildfires during deposition of the Upper Silesian Keuper succession, southern Poland

• Autorzy: Kubik R. , Uhl D. , Marynowski L.

Identyfikatory

DOI

10.14241/asgp.2014.009

• Języki publikacji: EN

Abstrakty

EN

Charcoals from the Upper Triassic vertebrate-bearing clays of the Zawiercie area (Upper Silesia, S-Poland) were analyzed using petrographic methods, to reconstruct burning temperatures as well as taphonomic processes. SEM and reflected light microscopy show excellent preservation of charcoals most probable connected with early diagenetic permineralization by calcite. The charcoal was assigned to three morphotypes, probably corresponding to three different fossil taxa. Fusinite reflectance data suggest, that the highest temperature reached above 600 °C (fusinite reflectance of 3.59%), what counterparts to the lower limit crown fire temperature. The values for most of the samples are lower (ca. 1% to 2.5%) what is typical for surface fires. In many cases fusinite reflectance values depends on the measured zone within the sample. Such zonation formed due to charring tem- perature differences. In zones remote from the potential fire source, reflectance values gradually decreases. It implies that calculation of fire temperatures based on average fusinite reflectance values might be too far-reaching simplification. Occurrence of fungal hyphae within the charcoal supports the interpretation of a predomination of surface fire, consuming dead twigs and stems. The low content of micro-charcoals in charcoal-bearing rocks as well as rounded to sub-rounded shapes of large specimens indicates that they were transported after burning, deposited away from the burning area, and finally early diagenetic mineralization.

Słowa kluczowe

EN

charcoals; wildfire; fusinite reflectance; taphonomy; Upper Triassic; Poland

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2015
• Tom: Vol. 85, No. 4
• Strony: 685--696
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Kubik R.

• Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
• Wrocław Research Centre EIT + Ltd., Stabłowicka 147, 54-066 Wrocław, Poland

autor

Uhl D.

• Senckenberg Forschungsinstitut und Naturmuseum Frankfurt, Senckenberganlage 25, 60325 Frankfurt am Main, Germany

autor

Marynowski L.

• Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland

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