Abstract
Paleogene continental Palynomorphs of the formations Chorrillo Chico and Agua Fresca, Pun- ta Prat, Magallanes, Chile. The Paleogene section of Punta Prat, Chile is located at 53°10'S-71°20'W in southern Magallanes-Austral Basin, includes Chorrillo Chico and Agua Fresca Formations. Both units contain a palynological assemblage composed of marine and continental palynomorphs indicative of a marine depositional environment with terrigenous input. The continental taxa found in the studied formations reflect a forest developed under a humid warm to temperate climate, dominated by Podocarpaceae, Proteaceae and Nothofagaceae accompanied by abundant ferns belonging to the Schizaeaceae, Polypodiaceae and Dicksoniaceae families. The relationship of marine/continental palynomorphs indicates a marine transgression from the Paleocene to the Middle Eocene. This transgression caused the decline of wetlands towards the top of the column, as shown by the low rate of swamp inhabiting palynomorphs in the upper levels of the Agua Fresca Formation.
Highlights
La cuenca de Magallanes-Austral (Chile-Argentina), desarrollada en el extremo sur de Sudamérica, se relaciona con la evolución de cuencas marinas cenozoicas asociadas al margen tectónicamente activo de los Andes
The Paleogene section of Punta Prat, Chile is located at 53°10’S-71°20’W in southern Magallanes-Austral Basin, includes Chorrillo Chico and Agua Fresca Formations. Both units contain a palynological assemblage composed of marine and continental palynomorphs indicative of a marine depositional environment with terrigenous input
The continental taxa found in the studied formations reflect a forest developed under a humid warm to temperate climate, dominated by Podocarpaceae, Proteaceae and Nothofagaceae accompanied by abundant ferns belonging to the Schizaeaceae, Polypodiaceae and Dicksoniaceae families
Summary
La cuenca de Magallanes-Austral (Chile-Argentina), desarrollada en el extremo sur de Sudamérica, se relaciona con la evolución de cuencas marinas cenozoicas asociadas al margen tectónicamente activo de los Andes. En la región occidental de la cuenca de Magallanes-Austral, se localiza el afloramiento marino de mayor espesor (aproximadamente 3.000 m estratigráficos es la suma de espesores de las formaciones Chorrillo Chico y Agua Fresca en sus localidades tipo, en Martínez-Pardo, 1971; Decat y Pomeyrol, 1931) del Paleógeno registrado hasta el momento (Quattrocchio y Sarjeant, 2003), depositado durante el evento regresivo-transgresivo ocurrido del Paleoceno al Eoceno (Malumián, 1999). Este evento solo se había reconocido en los principales depocentros, con base en el estudio de foraminíferos planctónicos y bentónicos (Natland et al, 1974) y de quistes de dinoflagelados (Quattrocchio, 2009), y se encuentra bien representado en la localidad Punta Prat en Chile (Quattrocchio y Sarjeant, 2003). En este trabajo se documentan por primera vez las asociaciones de palinomorfos continentales de las formaciones Chorrillo Chico y Agua Fresca, Punta Prat (Chile). Estas asociaciones palinológicas se comparan con otras reconocidas en la región austral de América del Sur
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