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Acevedo, R.D.; Rabassa, J.; Ponce, J.F.; Martínez, O.; Orgeira, M.J.; Prezzi, C.; Corbella, H.; González-Guillot, M.; Rocca, M.; Subías, I.; Vásquez, C. "The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas" (2012) Geomorphology. 169-170:151-164
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Abstract:

The Bajada del Diablo astrobleme-strewn field is a huge domain of enigmatic circular structures located in central Patagonia. Three more localities are herein described, adding to the first area studied so far. Taking into consideration the four areas, a single, blurred crater dispersion ellipse has been identified. The four sectors now have been investigated, mapped, and georreferenced. Their circular structures, with a total of 185 (some of which are partially obliterated by erosion or sediment accumulation), were identified by remote sensing techniques, but many have been evaluated in situ and interpreted as impact craters. Moreover, two of the structures have been surveyed in detail in the field using a total station instrument. In addition to the previously known occurrence of circular structures on the Eruptive Complex Quiñelaf (Miocene basalts), the Pampa Sastre Fm. (Pliocene conglomerates), and of the Pleistocene pediment gravels and sands, and the geomorphological inferences that have suggested the extra-terrestrial origin of this event, we should now add that the recurrent absence of the cited Pliocene stratigraphic unit at the bottom of the craters is found in the pediment gravel and sands. Its removal has been interpreted as directly related to the impact, according to the magnetometric record of existing magnetic anomalies. Other preliminary observations on the collected samples (glass, breccias, and, most relevant, Fe-Ni-bearing spherules picked up within the impact zones) are herein discussed. Two hypotheses have been put forward about the nature of the possible impacting object that formed these astroblemes which, fragmented into hundreds of pieces, hit the surface of the Earth most likely in middle Pleistocene times. One of these hypotheses is related to the impact of a disintegrated asteroid of the rubble pile type, whereas a second hypothesis refers to the collision of a split comet with the Earth surface. The latter hypothesis is favoured since no meteorite fragments have been found so far. © 2012.

Registro:

Documento: Artículo
Título:The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas
Autor:Acevedo, R.D.; Rabassa, J.; Ponce, J.F.; Martínez, O.; Orgeira, M.J.; Prezzi, C.; Corbella, H.; González-Guillot, M.; Rocca, M.; Subías, I.; Vásquez, C.
Filiación:Centro Austral de Investigaciones Científicas, CADIC-Conicet, B. Houssay n 200, V9410BFD, Ushuaia, TF, Argentina
Universidad Nacional de la Patagonia San Juan Bosco, Sede Ushuaia, Tierra del Fuego, Universidad Nacional de Tierra del Fuego, Argentina
Universidad Nacional de la Patagonia San Juan Bosco, Sede Esquel, Chubut, Argentina
Instituto de Geofísica Daniel A. Valencio, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, Núñez, Buenos Aires, Argentina
Universidad Nacional de la Patagonia Austral, Río Gallegos, Santa Cruz, Argentina
Conicet y Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Buenos Aires, Argentina
Universidad de Zaragoza, Departamento Ciencias de la Tierra, Zaragoza, Aragón, Spain
Palabras clave:Argentina; Astrobleme-strewn field; Bajada del Diablo; Patagonia; Pleistocene; asteroid; astrobleme; comet; crater; geomorphology; magnetic anomaly; pediment; Pleistocene; remote sensing; stratigraphy; Argentina; Patagonia; Spherules
Año:2012
Volumen:169-170
Página de inicio:151
Página de fin:164
DOI: http://dx.doi.org/10.1016/j.geomorph.2012.04.020
Título revista:Geomorphology
Título revista abreviado:Geomorphology
ISSN:0169555X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0169555X_v169-170_n_p151_Acevedo

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Citas:

---------- APA ----------
Acevedo, R.D., Rabassa, J., Ponce, J.F., Martínez, O., Orgeira, M.J., Prezzi, C., Corbella, H.,..., Vásquez, C. (2012) . The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas. Geomorphology, 169-170, 151-164.
http://dx.doi.org/10.1016/j.geomorph.2012.04.020
---------- CHICAGO ----------
Acevedo, R.D., Rabassa, J., Ponce, J.F., Martínez, O., Orgeira, M.J., Prezzi, C., et al. "The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas" . Geomorphology 169-170 (2012) : 151-164.
http://dx.doi.org/10.1016/j.geomorph.2012.04.020
---------- MLA ----------
Acevedo, R.D., Rabassa, J., Ponce, J.F., Martínez, O., Orgeira, M.J., Prezzi, C., et al. "The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas" . Geomorphology, vol. 169-170, 2012, pp. 151-164.
http://dx.doi.org/10.1016/j.geomorph.2012.04.020
---------- VANCOUVER ----------
Acevedo, R.D., Rabassa, J., Ponce, J.F., Martínez, O., Orgeira, M.J., Prezzi, C., et al. The Bajada del Diablo astrobleme-strewn field, central Patagonia Argentina: Extending the exploration to surrounding areas. Geomorphology. 2012;169-170:151-164.
http://dx.doi.org/10.1016/j.geomorph.2012.04.020