Late Quaternary neotectonics and mass movemnet in South East Raasay, Inner Hebrides, Scotland

Smith, D.E., Stewart, I.S., Harrison, S. and Firth, C.R. (2009) Late Quaternary neotectonics and mass movemnet in South East Raasay, Inner Hebrides, Scotland Proceedings of the Geologists' Association, 120 (2-3). pp. 145-154. ISSN 0016-7878

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Abstract

Features associated with the Hallaig Fault, SE Raasay, are examined. The fault, which runs along the NW slope of the hill mass of Beinn na Leac, is marked by a narrow trench, running for over 3 km NE-SW. About 600 m from its N end, the trench becomes almost obscured for 500 m by a bench composed of talus. SW of this a ridge of talus up to 5 m high occupies the downslope side of the trench for 1.2 km. The total volume of talus is estimated at around 90,000m3. In the SW, the trench splits into two, separating discrete bedrock areas from the hillside. Possible mechanisms forming the trench and associated features are considered. It is maintained that the features were primarily the result of the reactivation of a listric fault, triggered by isotatic processes during and following deglaciation and that they reached their present form during the Younger Dryas. Maximum vertical movement is estimated at at least 5 m. The unconsolidated sediment comprising the ridge and bench is believed to have been primarily the product of periglacial processes and paraglacial activity.

Item Type:Journal article
Uncontrolled Keywords:Neotectonics; mass-movement; glacio-isostacy; periglacial, paraglacial, Raasay
Subjects:F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F840 Physical Geography
F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F820 Geomorphology
DOI (a stable link to the resource):10.1016/j.pgeola.2009.08.006
Faculties:Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology
ID Code:6456
Deposited By:editor environment
Deposited On:10 Nov 2009
Last Modified:25 Apr 2012 10:47

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