Show simple item record Glasser, Neil F. Ghiglione, Matias C. 2010-12-15T10:52:55Z 2010-12-15T10:52:55Z 2009-04-15
dc.identifier.citation Glasser , N F & Ghiglione , M C 2009 , ' Structural, tectonic and glaciological controls on the evolution of fjord landscapes ' Geomorphology , vol 105 , no. 3-4 , pp. 291-302 . DOI: 10.1016/j.geomorph.2008.10.007 en
dc.identifier.issn 0169-555X
dc.identifier.other PURE: 155472
dc.identifier.other PURE UUID: a7893ee7-06a6-4550-9f1e-5767c2ca3a5b
dc.identifier.other dspace: 2160/6009
dc.identifier.other DSpace_20121128.csv: row: 3846
dc.identifier.other RAD: 43
dc.identifier.other RAD_Outputs_All_ID_Import_20121105.csv: row: 32
dc.identifier.other Scopus: 60349118356
dc.description Glasser, N. F., Ghiglione, M. C. (2009). Structural, tectonic and glaciological controls on the evolution of fjord landscapes. Geomorphology, 105 (3/4): 291-302. en
dc.description.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. en
dc.format.extent 12 en
dc.language.iso eng
dc.relation.ispartof Geomorphology en
dc.rights en
dc.subject fjords en
dc.subject South America en
dc.subject Patagonia en
dc.subject structural geology en
dc.subject tectonics en
dc.subject glacial geomorphology en
dc.title Structural, tectonic and glaciological controls on the evolution of fjord landscapes en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Department of Geography and Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en

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