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Stratigraphic and paleofloristic record of the Lower Permian postglacial succession in the southern Brazilian Paraná Basin

By
Roberto Iannuzzi
Roberto Iannuzzi
Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Cx.P. 15.001, CEP. 91.501-970, Porto Alegre, RS, Brazil
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Paulo A. Souza
Paulo A. Souza
Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Cx.P. 15.001, CEP. 91.501-970, Porto Alegre, RS, Brazil
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Michael Holz
Michael Holz
Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Cx.P. 15.001, CEP. 91.501-970, Porto Alegre, RS, Brazil
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Published:
August 01, 2010

A correlation between plant zones and palynozones within a sequence-stratigraphic framework for the upper Paleozoic rocks of the Paraná Basin, Brazil, is attempted for the first time. Our study indicates that (1) the stratigraphic boundaries (lithostratigraphic boundaries and sequence boundaries) are not coincident with most of the biostratigraphic horizons; (2) the boundaries between palynozones and plant zones are also not coincident with each other; and (3) the boundaries of palynozones lie near the maximum flooding surfaces through the interval analyzed. The emerging pattern suggests that plant zones are mostly controlled by depositional processes and palynozones by climate-driven changes. Therefore, the plant zones correspond to distinct ecofacies, and are better regarded as ecozones rather than as biozones. On the other hand, the climatic changes that affected the palynofloras were related directly to the most significant transgressive events, suggesting a link with eustatic oscillations caused by Early Permian Glacial-Interglacial Phases. Aims of further work may include (a) evaluation of taphonomic controls in plant-bearing beds, (b) better understanding of the relation between the plant-bearing strata and their equivalent palynologic zones, (c) correlation between palynologic and paleobotanic data and the sequence-stratigraphic framework already established in other areas, and (d) improvement of the chronostratigraphic chart of the basin through the discovery of layers suitable for radiometric dating.

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GSA Special Papers

Late Paleozoic Glacial Events and Postglacial Transgressions in Gondwana

Oscar R. López-Gamundí
Oscar R. López-Gamundí
Hess Corporation, Houston, Texas, USA
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Luis A. Buatois
Luis A. Buatois
Department of Geological Sciences, University of Saskatchewan, Saskatoon, Canada
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Geological Society of America
Volume
468
ISBN print:
9780813724683
Publication date:
August 01, 2010

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