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Abstract:

The analyses of the observations of Charles Darwin at Puente del Inca, during his second journey across the High Andes drew attention on two different aspects of the geological characteristics of this classic area. Most of his descriptions on the characteristics and the origin of the natural bridge were not published, mainly due to his poor impression of Puente del Inca. However, the application of the uniformitarian principles shows that it was formed as an ice bridge associated with snow and debris avalanches later on cemented by the minerals precipitated by the adjacent hot-water springs. Darwin's observations on the complex structural section at Puente del Inca, together with his findings of shallow water marine fossil mollusks in the thick stratigraphic column of the area interfingered with volcanic rocks, led him to speculate on several geological processes. Based on his geological observations, Darwin argued on the mountain uplift, the subsidence of the marine bottom, the episodic lateral growth of the cordillera, and their association with earthquakes and volcanic activity, which was an important advance in the uniformitarian hypothesis of mountain uplift proposed by Charles Lyell. Darwin was able to recognize the episodic nature of mountain uplift, and based on these premises he concluded that the Andes were still undergoing uplift. Taken as a whole, his ideas anticipated in many years some of the premises of the geosynclinal theory, and current hypothesis on foreland migration of the fold and thrust belts.

Registro:

Documento: Artículo
Título:Darwin at Puente del Inca: Observations on the formation of the Inca's bridge and mountain building
Autor:Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, FCEN, Universidad de Buenos Aires - CONICET, Argentina
Palabras clave:Andes; Ice-bridge; Lateral growth; Mountain uplift; Subsidence; Volcanism; biostratigraphy; debris avalanche; fold and thrust belt; fossil; mollusc; snow; structural geology; subsidence; uplift; volcanism; Mollusca
Año:2009
Volumen:64
Número:1
Página de inicio:170
Página de fin:179
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v64_n1_p170_Ramos

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Citas:

---------- APA ----------
(2009) . Darwin at Puente del Inca: Observations on the formation of the Inca's bridge and mountain building . Revista de la Asociacion Geologica Argentina, 64(1), 170-179.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v64_n1_p170_Ramos [ ]
---------- CHICAGO ----------
Ramos, V.A. "Darwin at Puente del Inca: Observations on the formation of the Inca's bridge and mountain building " . Revista de la Asociacion Geologica Argentina 64, no. 1 (2009) : 170-179.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v64_n1_p170_Ramos [ ]
---------- MLA ----------
Ramos, V.A. "Darwin at Puente del Inca: Observations on the formation of the Inca's bridge and mountain building " . Revista de la Asociacion Geologica Argentina, vol. 64, no. 1, 2009, pp. 170-179.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v64_n1_p170_Ramos [ ]
---------- VANCOUVER ----------
Ramos, V.A. Darwin at Puente del Inca: Observations on the formation of the Inca's bridge and mountain building . Rev. Asoc. Geol. Argent. 2009;64(1):170-179.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v64_n1_p170_Ramos [ ]