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Piedmont Glaciations, Volcanism and Landscape Evolution in Southernmost Patagonia, Argentina

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Advances in Geomorphology and Quaternary Studies in Argentina

Part of the book series: Springer Earth System Sciences ((SPRINGEREARTH))

Abstract

North of the Gallegos River valley, glacigenic deposits outcrop in two altimetric levels. The Meseta Latorre is the highest level (1,064 m a.s.l.), a relic of the ancient Andean piedmont. A degraded basal moraine and a frontal/lateral ridge occupy the summit of the tableland. Their deposits are here recognized as the Meseta Latorre Drift, and considered as Late Miocene in age. The second piedmont level is located eastwards at an altitude of ~100 m lower than the highest one. At its surface, two nested systems of marginal moraines, with glaciofluvial deposits, are recognized. The outer system is herein defined as the Los Vascos Drift, whereas the inner one is the Bella Vista Drift, dated at ~1 Ma. This drift is equivalent to the Great Patagonian Glaciation within the Gallegos River valley. Volcanic cones, lava flows, phreatomagmatic deposits and fluvial sediments were partially/totally buried by both drift deposits. Volcanic activity is basaltic, transitional and alkaline in composition and it took place between 8.0 and 9.0 Ma, according to Ar40/Ar39 dating. This paper presents new evidence about the extent of ancient glaciations that occupied the extra-Andean tablelands and its relationship with tectonism and volcanism, as well as the landscape evolution.

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Acknowledgements

This research was supported by grants from the Universidad Nacional de la Patagonia Austral (PI 29/A365), Río Gallegos, Argentina, and by own funding of the authors. We thank the owners and administrators of the Los Vascos, Bella Vista, Sofía, Paso del Medio and El Palenque ranches for allowing access to their properties. We thank Jorge Rabassa (CADIC-CONICET) and John Clague (Simon Fraser University) for discussions on earlier versions of this manuscript. We express our gratitude to Susana Alonso (UBA) for her helpful comments on facies analysis and the English version of this topic. Our gratitude to the anonymous reviewer for his suggestions and finally, to the VII Geomorphology and Quaternary Congress organizers for inviting us to publish our research in this book.

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Authors and Affiliations

  1. ICASUR-UNPA, Avenida Gobernador Gregores y Piloto “Lero” Rivera, 9400, Río Gallegos, Argentina

    Bettina Ercolano, Hugo Corbella, Pedro Tiberi & Guillermina Marderwald

  2. CADIC-CONICET, B. Houssay 200, 9410, Ushuaia, Argentina

    Andrea Coronato

  3. ICPA-UNTDF, Walanika 250. 1º Piso. Oficina 18, 9410, Ushuaia, Argentina

    Andrea Coronato

  4. MACN-CONICET, Avenida Ángel Gallardo 490. 54 11, C1405DJR, Buenos Aires, Argentina

    Hugo Corbella

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  1. Bettina Ercolano
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  2. Hugo Corbella
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  4. Andrea Coronato
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  5. Guillermina Marderwald
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Correspondence to Bettina Ercolano .

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  1. Instituto Patagónico para el Estudio de los Ecosistemas Continentales (IPEEC) CONICET, Centro Nacional Patagonico, Puerto Madryn, Chubut, Argentina

    Pablo Bouza

  2. Laboratorio de Geomorfología y Cuaternario, CADIC-CONICET, Ushuaia, Argentina

    Jorge Rabassa

  3. Instituto Patagónico de Geología y Paleontología (IPGP) CONICET, Puerto Madryn, Chubut, Argentina

    Andrés Bilmes

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Ercolano, B., Corbella, H., Tiberi, P., Coronato, A., Marderwald, G. (2021). Piedmont Glaciations, Volcanism and Landscape Evolution in Southernmost Patagonia, Argentina. In: Bouza, P., Rabassa, J., Bilmes, A. (eds) Advances in Geomorphology and Quaternary Studies in Argentina. Springer Earth System Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-66161-8_15

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