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Evidence for multiphase water-escape during rafting of shelly marine sediments at Clava, Inverness-shire, NE Scotland

Phillips, Emrys; Merritt, Jonathan. 2008 Evidence for multiphase water-escape during rafting of shelly marine sediments at Clava, Inverness-shire, NE Scotland. Quaternary Science Reviews, 27 (9-10). 988-1011. 10.1016/j.quascirev.2008.01.012

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Abstract/Summary

The Pleistocene shelly glaciomarine sediments exposed at Clava, near Inverness northeast Scotland occur in a series of thrust-bound rafts accreted at on the up-ice side of a bedrock high (150 m above OD) on the SE side of the valley of the River Nairn. These sediments originally formed part of a coarsening upwards deltaic or subaqueous fan sequence deposited in the marine fjord of the Loch Ness basin, located some 50 km to the SW. The geometry of these allochthonous rafts, coupled with the associated thrusting and large-scale folding of these bodies, are typical of many glacially-transported rafts described in the literature. However, at Clava, macro- and microscopic evidence indicates that these ice-rafted sediments were not frozen, with liquefaction, hydrofracturing and water-escape occurring repeatedly during their transport and accretion. The presence of large-scale detachments within the sequence, has led to the development of a purely glacitectonic model for rafting at Clava. The detachments acted as a focus for fluid flow which lubricated these décollement surfaces, aiding in the subglacial transport of the rafts.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.quascirev.2008.01.012
Programmes: BGS Programmes 2008 > Geology and Landscape Scotland
ISSN: 0277-3791
Additional Keywords: Marine sediments, Pleistocene, Invernessshire
NORA Subject Terms: Glaciology
Earth Sciences
Date made live: 20 Aug 2008 12:50
URI: http://nora.nerc.ac.uk/id/eprint/3922

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