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Abstract:

Quaternary tectonic activity in the transition area between the Central and Patagonian Andes is closely associated with an anomalous cluster of rockslides: 19 rockslides with volumes up to 4 × 109 m3 developed in plateau basalts. We divided them into two groups: (A) rockslides related to neotectonic activity and (B) rockslides not related to neotectonic activity. Thirteen rockslides, with a total volume of ~10 km3, which lie on either folds or faults, have been displaced parallel to the structures and perpendicular to the valleyaxis, and they exhibit headscarps several kilometersaway from the valley axis. Most of them are larger than 109 m3, and are generally of rock avalanche type with a high degree of crushing of rocks, although local relief in some cases does not exceed 200 m. Nine rockslides with a total volume of 8.9 km3 are related to folds, while four with a total volume of 1.3 km3 are related to faults. The six rockslides not related to neotectonic activity have a totalvolume of 0.25 km3 (of which the largest one accounts for 0.17 km3), and are rotational slides and block topples with a low degree of rock fragmentation, although local relief is up to 400 m. The 3He and 21Ne surface exposure ages for six of these slides, as well as relative age assessment based on stratigraphic relation with glacial deposits and the drainage development on the rockslide deposit, suggest that the rockslide ages spread rather randomly betweenpre-glacial and mid Holocene, discarding climatic conditions as a common triggering factor. The absence of structures that can represent ideal sliding planes shows that rock fracturing due to neotectonic activity is a major conditioning factor for failures and that the magnitude of landslides is strongly controlled by the type of deformation. © 2011 Geological Society of America.

Registro:

Documento: Artículo
Título:Multiple slope failures associated with neotectonic activity in the Southern Central Andes (37° -37°30's), Patagonia, Argentina
Autor:Penna, I.M.; Hermanns, R.L.; Niedermann, S.; Folguera, A.
Filiación:Laboratorio de Tectónica Andina, Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, pabellón II, 1427 Buenos Aires, Argentina
Norges geologiske undersøkelse, Leiv Eirikssons vei 39, NO 7491 Trondheim, Norway
Helmholtz-Zentrum Potsdam-Deutsches GeoForschungsZentrum, Telegrafenberg, D-14473 Potsdam, Germany
Palabras clave:Argentina; Central Andes; Climatic conditions; Glacial deposits; Holocenes; Low degree; Neotectonics; Patagonia; Rock avalanche; Rock fracturing; Rock fragmentation; Sliding planes; Slope failure; Surface exposure age; Tectonic activity; Triggering factors; Deposits; Glacial geology; Rock bursts; Rocks; Stratigraphy; Landslides; fault; fold; fragmentation; landslide; neotectonics; plateau; rock avalanche; rock mechanics; slope failure; stratigraphy; Andes; Argentina; Patagonia
Año:2011
Volumen:123
Número:9-10
Página de inicio:1880
Página de fin:1895
DOI: http://dx.doi.org/10.1130/B30399.1
Título revista:Bulletin of the Geological Society of America
Título revista abreviado:Bull. Geol. Soc. Am.
ISSN:00167606
CODEN:BUGMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v123_n9-10_p1880_Penna

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Citas:

---------- APA ----------
Penna, I.M., Hermanns, R.L., Niedermann, S. & Folguera, A. (2011) . Multiple slope failures associated with neotectonic activity in the Southern Central Andes (37° -37°30's), Patagonia, Argentina. Bulletin of the Geological Society of America, 123(9-10), 1880-1895.
http://dx.doi.org/10.1130/B30399.1
---------- CHICAGO ----------
Penna, I.M., Hermanns, R.L., Niedermann, S., Folguera, A. "Multiple slope failures associated with neotectonic activity in the Southern Central Andes (37° -37°30's), Patagonia, Argentina" . Bulletin of the Geological Society of America 123, no. 9-10 (2011) : 1880-1895.
http://dx.doi.org/10.1130/B30399.1
---------- MLA ----------
Penna, I.M., Hermanns, R.L., Niedermann, S., Folguera, A. "Multiple slope failures associated with neotectonic activity in the Southern Central Andes (37° -37°30's), Patagonia, Argentina" . Bulletin of the Geological Society of America, vol. 123, no. 9-10, 2011, pp. 1880-1895.
http://dx.doi.org/10.1130/B30399.1
---------- VANCOUVER ----------
Penna, I.M., Hermanns, R.L., Niedermann, S., Folguera, A. Multiple slope failures associated with neotectonic activity in the Southern Central Andes (37° -37°30's), Patagonia, Argentina. Bull. Geol. Soc. Am. 2011;123(9-10):1880-1895.
http://dx.doi.org/10.1130/B30399.1