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Abstract:

The fjord landscape of South America, stretching ~ 1500 km between Golfo Corcovado (~ 43°S) and Tierra del Fuego (~ 56°S), is the largest continuous fjord landscape on Earth. This paper presents the results of new structural geological and geomorphological mapping of this landscape using optical satellite images and digital elevation models. First-order geological structures are represented by strike-slip faults forming lineaments up to hundreds of kilometres long. The strike-slip faulting has been active since Late Cretaceous times and is responsible for the presence of a conspicuous structural cleavage visible as lineaments up to ~ 10 km long. A detailed analysis of these second-order lineaments from digital image data was carried out in three sectors. In Sector 1, located northwest of the North Patagonian Icefield, there are three distinct mean orientations, characterized by a main nearly orogen-parallel orientation (az. ~ 145°) and two orogen-oblique secondary orientations (az. ~ 20° and az. ~ 65°). In Sector 2, located west of the South Patagonian Icefield, there are also three separate mean orientations, with most of the lineaments concentrated between azimuths 0° and 80° (mean at ~ 36°); and two other orogen-oblique means at azimuth ~ 122° and ~ 163°. In Sector 3, around the Cordillera Darwin, there is a single main orogen-parallel mean at ~ 100-115°. In all three sectors, mapped fjord orientations bear a striking similarity to the structural data, with fjords orientated preferentially in the same direction as structural lineaments. We infer that successive glaciations followed the same ice-discharge routes, widening and deepening pre-existing geological structures at the expense of the surrounding terrain to create the fjord landscape. This study has broader implications for ice sheet reconstructions and landscape evolution beneath ice sheets because we demonstrate that the primary control on fjord development in glaciated areas is geological and not glaciological. © 2008 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Structural, tectonic and glaciological controls on the evolution of fjord landscapes
Autor:Glasser, N.F.; Ghiglione, M.C.
Filiación:Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, SY23 3DB Wales, United Kingdom
CONICET, Laboratorio de Tectónica Andina, FCEyN, Ciudad Universitaria, C1428EHA, Argentina
Palabras clave:Fjords; Glacial geomorphology; Patagonia; South America; Structural geology; Tectonics; Cretaceous; digital elevation model; fjord; geological structure; geomorphology; glaciology; ice sheet; landscape evolution; lineament; satellite imagery; strike-slip fault; Patagonia; South America
Año:2009
Volumen:105
Número:3-4
Página de inicio:291
Página de fin:302
DOI: http://dx.doi.org/10.1016/j.geomorph.2008.10.007
Título revista:Geomorphology
Título revista abreviado:Geomorphology
ISSN:0169555X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0169555X_v105_n3-4_p291_Glasser

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Citas:

---------- APA ----------
Glasser, N.F. & Ghiglione, M.C. (2009) . Structural, tectonic and glaciological controls on the evolution of fjord landscapes. Geomorphology, 105(3-4), 291-302.
http://dx.doi.org/10.1016/j.geomorph.2008.10.007
---------- CHICAGO ----------
Glasser, N.F., Ghiglione, M.C. "Structural, tectonic and glaciological controls on the evolution of fjord landscapes" . Geomorphology 105, no. 3-4 (2009) : 291-302.
http://dx.doi.org/10.1016/j.geomorph.2008.10.007
---------- MLA ----------
Glasser, N.F., Ghiglione, M.C. "Structural, tectonic and glaciological controls on the evolution of fjord landscapes" . Geomorphology, vol. 105, no. 3-4, 2009, pp. 291-302.
http://dx.doi.org/10.1016/j.geomorph.2008.10.007
---------- VANCOUVER ----------
Glasser, N.F., Ghiglione, M.C. Structural, tectonic and glaciological controls on the evolution of fjord landscapes. Geomorphology. 2009;105(3-4):291-302.
http://dx.doi.org/10.1016/j.geomorph.2008.10.007