New palynological information from the Poti Formation (upper Visean) at the Roncador creek, Parnaíba Basin, northeastern Brazil

M. di Pasquo; R. Iannuzzi

doi:10.21701/bolgeomin.125.4.001

Autores/as

M. di Pasquo National Research Council of Argentina (CONICET), Laboratorio de Palinoestratigrafía y Paleobotánica, CICyTTP-CONICET
R. Iannuzzi Instituto de Geociências, Universidad Federal Río Grande do Sul

DOI:

https://doi.org/10.21701/bolgeomin.125.4.001

Palabras clave:

bioestratigrafía, Formación Poti, noreste Brasil, palinomorfos, Viseano tardío

Resumen

Se presenta el resultado del análisis palinológico de seis muestras de superficie de la Formación Poti expuesta en el arroyo Roncador (Jerumenha, Piauí), noreste de Brasil. Esta unidad sobreyace en discordancia a la Formación Longá (Famenniano superior-Tournaisiano) y sobre ella se dispone en discordancia la Formación Piaui (Pennsylvaniano inferior). Lutitas carbonosas y limolitas brindaron una diversa asociación de palinomorfos bien preservados, compuesta por 95 especies: 58 especies autóctonas de esporas y 5 de algas, y 9 especies de esporas y 23 especies de microplancton retrabajados principalmente de depósitos del Devónico. Se describen tres nuevas especies (Verrucosisporites iannuzzii, V. roncadorense, V. souzai). Se documenta el primer registro de 24 especies para el Mississippiano de Brasil y 7 especies para América del Sur. Entre las especies con valor estratigráfico registradas en la sección aquí estudiada Anapiculatisporites amplus, A. concinnus, Foveosporites pellucidus, Grandispora maculosa, Reticulatisporites magnidictyus, Verrucosisporites morulatus, Waltzispora polita, junto con otras no registradas previamente en la Formación Poti (Apiculiretusispora microseta, Densosporites spinosus, Knoxisporites ruhlandi, Punctatisporites subvaricosus, Retusotriletes mirabilis, Tricidarisporites phippsae), confirman una edad Viseano tardío y su correlación con la Zona R. magnidictyus (Mag) Melo y Loboziak. La comparación mundial del presente conjunto palinológico indica una gran afinidad con palinofloras coetáneas distribuidas en paleolatitudes similares en América del Sur, Norte de África y Australia (Reino Paracas). Las características sedimentológicas (e.g., areniscas con estratificación cruzada sigmoidal y ondulitas) y paleontológicas (e.g., restos de plantas y abundante materia orgánica terrestre) de la sección indican que la depositación ocurrió en un ambiente de estuario de baja profundidad.

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