An integrative analysis on advances and perspectives of the Pennsylvanian and Permian palynostratigraphy in the Paraná/Chacoparaná Basin (Brazil, Argentina and Uruguay)

SOUZA, P.A., VERGEL, M.M. , BERI, A.

Gramado, Brasil

Workshop; I Workshop - Problems in Western Gondwana Geology; 2007

IG-UFRGS

Pennsylvanian and Permian palyniferous sedimentary beds of the Paraná/Chacoparaná Basin are known from Argentina, Brazil and Uruguay, and have allowed distinct biostratigraphical zonal schemes. Pennsylvanian palynozones are recognized in the northeastern portion of the Brazilian Paraná Basin (Ahrensisporites cristatusAhrensisporites cristatus and Crucisaccites monoletus palynozones) and within the Chacoparaná Basin in Argentina (Potonieisporites- Lundbladispora playnozone). Pteridophytic spores and monosaccate pollen grains related to the Cordaitales and Coniferales are dominant in these palynozones. The Permian Vittatina costabilis and Lueckisporites virkkiaeCrucisaccites monoletus palynozones) and within the Chacoparaná Basin in Argentina (Potonieisporites- Lundbladispora playnozone). Pteridophytic spores and monosaccate pollen grains related to the Cordaitales and Coniferales are dominant in these palynozones. The Permian Vittatina costabilis and Lueckisporites virkkiaeplaynozone). Pteridophytic spores and monosaccate pollen grains related to the Cordaitales and Coniferales are dominant in these palynozones. The Permian Vittatina costabilis and Lueckisporites virkkiaeVittatina costabilis and Lueckisporites virkkiae palynozones of the Paraná Basin are adequately correlated with the Cristatisporites and Striatites zones in Argentina, as well as with the Cristatisporites inconstans-Vittatina subsaccata and the Striatoabieites anaverrucosus-Staurosaccites cordubensis zones of the Paraná Basin in Uruguay, respectively, although differences be found. A greater palynological diversity characterizes the older Permian palynozones (Vittatina costabilis, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common andCristatisporites and Striatites zones in Argentina, as well as with the Cristatisporites inconstans-Vittatina subsaccata and the Striatoabieites anaverrucosus-Staurosaccites cordubensis zones of the Paraná Basin in Uruguay, respectively, although differences be found. A greater palynological diversity characterizes the older Permian palynozones (Vittatina costabilis, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common andCristatisporites inconstans-Vittatina subsaccata and the Striatoabieites anaverrucosus-Staurosaccites cordubensis zones of the Paraná Basin in Uruguay, respectively, although differences be found. A greater palynological diversity characterizes the older Permian palynozones (Vittatina costabilis, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common andzones of the Paraná Basin in Uruguay, respectively, although differences be found. A greater palynological diversity characterizes the older Permian palynozones (Vittatina costabilis, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common andVittatina costabilis, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common and, Cristatisporites and Cristatisporites inconstans-Vittatina subsaccata), marked by the presence of several taeniate pollen grains related to the incoming of the Glossopterids, as well as by a variety of other groups (bisaccate, polyplicate, pollen grains). Among the spores, cingulizonate species are very common and Converrucosisporites confluens seems to be a significant marker for correlation. The younger Permian palynozones (Lueckisporites virkkiae, Striatites and Striatoabieites anaverrucosus-Staurosaccites cordubensis) show similarities on the frequency of palynologic groups, such as dominance of taeniate pollen grains, which reach up to 80% of certain assemblages, and the lower frequency of spores, which are rare or scarce within certain levels. Radiometric data have been obtained in these last years to these deposits, and have contributed for the age calibration of these palynozones with the international geological scale. These palynological radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein. radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein.seems to be a significant marker for correlation. The younger Permian palynozones (Lueckisporites virkkiae, Striatites and Striatoabieites anaverrucosus-Staurosaccites cordubensis) show similarities on the frequency of palynologic groups, such as dominance of taeniate pollen grains, which reach up to 80% of certain assemblages, and the lower frequency of spores, which are rare or scarce within certain levels. Radiometric data have been obtained in these last years to these deposits, and have contributed for the age calibration of these palynozones with the international geological scale. These palynological radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein. radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein.Lueckisporites virkkiae, Striatites and Striatoabieites anaverrucosus-Staurosaccites cordubensis) show similarities on the frequency of palynologic groups, such as dominance of taeniate pollen grains, which reach up to 80% of certain assemblages, and the lower frequency of spores, which are rare or scarce within certain levels. Radiometric data have been obtained in these last years to these deposits, and have contributed for the age calibration of these palynozones with the international geological scale. These palynological radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein. radiometric data and their significance within the Occidental Gondwana context are summarized and analysed herein.