A large landslide event in a post-glacial landscape: rethinking glacial legacy

Davies, Timothy, Warburton, Jeff, Dunning, Stuart and Bubeck, Alodie (2013) A large landslide event in a post-glacial landscape: rethinking glacial legacy. Earth Surface Processes and Landforms, 38 (11). pp. 1261-1268. ISSN 0197-9337

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Official URL: http://dx.doi.org/10.1002/esp.3377

Abstract

Threlkeld Knotts (c. 500 m above sea level) in the English Lake District has hitherto been considered to be a glacially-modified intrusion of microgranite. However, its surface features are incompatible with glacial modification; neither can these nor the subsurface structures revealed by ground-penetrating radar (GPR) be explained by post-glacial subaerial processes acting on a glacially-modified microgranite intrusion. Here we re-interpret Threlkeld Knotts as a very large post-glacial landslide involving the microgranite, with an estimated volume of about 4 × 107 m3. This interpretation is tested against published and recent information on the geology of the site, the glacial geomorphic history of the area and newly-acquired GPR data. More than 60 large post-Last Glacial Maximum (LGM) rock–slope failures have significantly modified the glaciated landscape of the Lake District; this is one of the largest. Recognition of this major landslide deposit in such a well-studied environment highlights the need to continuously re-examine landscapes in the light of increasing knowledge of geomorphic processes and with available technology in currently active or de-glaciating environments.

Item Type: Article
Additional Information: Published online before print.
Uncontrolled Keywords: rock–slope failures, English Lake District, mountain geomorphology, ground penetrating radar, Holocene
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Stuart Dunning
Date Deposited: 26 Feb 2013 09:22
Last Modified: 10 Aug 2015 11:08
URI: http://nrl.northumbria.ac.uk/id/eprint/11204

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