Circular Natural Geoforms, Sierras Pampeanas and Chacopampeana Plain, Argentina

Structural geoforms also help us to understand the mechanisms that have given rise to them. Meteorite drop, the volcanic caldera or the intrusion of igneous bodies, and elliptical geoforms of tectonic processes are usually associated of circular geoforms. Based on visual interpretations from satellite and radar scanning images, we identify eight circular morphological features representing depressed regions. In the northern part of the Sierras Pampeanas, there are three geoforms and five in the Chacopampeana plain of Argentina. The circular shape of La Ciénaga has a diameter of 15 km, Las Cejas has a diameter of 34 km and Schaqui is 21 km in diameter. The semicircular structures (Las Víboras, El Fadeté, La Irma and Laguna de los Cisnes) of the Chacopampeana plain are between 15 and 31,5 km in diameter. An E-W attack, 12 km long and 4 km high, has similar characteristics to those mentioned in the literature, in the elongated Campo del Cielo structure linked to the El Fadeté structure. In an area of intrusive rocks, the Schaqui structure is formed and its morphology is marked by the interaction between them. Seismic profiles show the normal fault of one of its edges and the basin produced at its centre in the Las Cejas structure. Several structures consistent with the fall of meteorites were found in Campo del Cielo; the structures mentioned there seem to be created by an object’s impact and contrast with the monotony of the rest of the region. In Argentina, rings with these features, magnitudes and diameters have until now been unknown and unheard with.

Author (s) Details

Adolfo Antonio Gutiérrez
Universidad Nacional de Tucumán, Tucumán, Argentina.

Ricardo Mon
CONICET, Argentina.

Clara Eugenia Cisterna
CONICET, Argentina.

Ahmad Arnous
Universidad Nacional de Tucumán, Tucumán, Argentina.

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