Deglaciation and neotectonics in South East Raasay, Scottish Inner Hebrides

Journal article


Smith, David E., Firth, C., Mighall, T. and Teasdale, Phill A. 2021. Deglaciation and neotectonics in South East Raasay, Scottish Inner Hebrides. Scottish Journal of Geology. 2021, pp. sjg2021-006. https://doi.org/10.1144/sjg2021-006
AuthorsSmith, David E., Firth, C., Mighall, T. and Teasdale, Phill A.
AbstractChanges in the physical landscape of SE Raasay at the end of the last Quaternary glaciation are examined. The area is marked by a major fault system defining the Beinn na Leac Fault Block, and field survey shows this to comprise a rollover anticline in the SW, with extensional movement towards the NE along an oblique transfer fault, the Main Beinn na Leac Fault. The fault system was reactivated after the Last Glacial Maximum (the LGM). Survey of a distinctive ridge of detached scree along the Main Beinn na Leac fault shows it to have involved a single movement of at least 7.12m vertical displacement, arguably the greatest fault movement since before the Younger Dryas in Scotland. The present work confirms that the scree became detached during the Younger Dryas, but finds that it overlies a lacustrine deposit of at least 5.6m of laminated sediments from a lake which had begun to accumulate earlier. Radiocarbon dating of peat overlying the lake sediments gave 10,176 – 10,315 cal. BP, but morphological and stratigraphical evidence indicates that drainage of the lake occurred earlier and only shortly before movement of the scree. Possible causes of displacement at the fault system are briefly discussed.
KeywordsGeology; Scotland
Year2021
JournalScottish Journal of Geology
Journal citation2021, pp. sjg2021-006
PublisherGeological Society of London
ISSN0036-9276
2041-4951
Digital Object Identifier (DOI)https://doi.org/10.1144/sjg2021-006
Official URLhttps://doi.org/10.1144/sjg2021-006
Publication dates
Online18 May 2021
Publication process dates
Accepted03 May 2021
Deposited27 May 2021
Output statusPublished
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