Palinologia da Formação Irati (Permiano Inferior da Bacia do Paraná), em Montividiu, Goiás, Brasil

• Autores: Eduardo Premaor, Tiago Fischer, Paulo A. Souza
• Localización: Revista del Museo Argentino de Ciencias Naturales, ISSN-e 1853-0400, ISSN 1514-5158, Vol. 8, Nº. 2, 2006, págs. 221-230
• Idioma: español
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• Resumen

  • Palynology of the Irati Formation (Lower Permian, Paraná Basin), from Montividiu, Goiás,Brasil. The Irati Formation represents an important lithostratigraphic datum within the Permian of the ParanáBasin, due to its stratigraphical distribution and varied fossil content. Among the fossil groups, sporomorphsconstitute the most efficient tool in providing a biostratigraphic refinement to the Upper Paleozoic sequence ofthe basin. The taxonomic and biostratigraphic results from the palynological analysis of samples collected in anoutcrop in the «vale do rio da Serra», ca. 10 km at North of Montividiu, Goiás State (central-western portion ofBrazil), related to the Assistência Member (upper Irati Formation) are presented. The analysis revealed adiversified microflora, especially rich in bisaccate taeniate and non-taeniate and polyplicate pollen grains; sporesand monosaccate pollen grains are rare. Qualitatively, the main genera are Alisporites Daugherty emend.Jansonius, Limitisporites Leschik emend. Klauss, Protohaploxypinus Samoilovich emend. Morbey,Striatopodocarpites Zoricheva & Sedova ex Sedova emend. Hart, Striatoabieites Zoricheva & Sedova ex Sedovaemend. Hart, Lueckisporites Potonié & Klauss emend. Klauss, Lunatisporites Leschik emend. Scheuring,Weylandites Bharadwaj & Srivastava and Marsupipollenites Balme & Hennely emend. Balme. The assemblageis related to the Lueckisporites virkkiae Interval Zone. Based on previous geochronologic data, as well as onpalynological correlation, an Artinskian age is proposed to the Irati Formation.