International Geologiical Congress - Oslo 2008

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CGC-13 Fjords: climate and environmental change

 

Deglaciation of western Scotland: Multibeam bathymetry and marine sediment archives from a fjordic landsystem

 

Kate McIntyre, Scottish Association for Marine Science (United Kingdom)
Tom Bradwell, British Geological Survey (United Kingdom)
Tracy Shimmield, Scottish Association for Marine Science (United Kingdom)
John Howe, Scottish Association for Marine Science (United Kingdom)
 

 

This project aims to test the limits and influence of the late glacial ice sheet and subsequent late to post-glacial sediment fill in the pristine fjordic landsystem off the west coast of Scotland. We aim to map the onshore and offshore late glacial ice sheet limits and establish a chronology for deglaciation and post-glacial landscape evolution over the last 15,000 years. Across the west coast of Scotland glacial influence is everywhere manifest in the present-day shape and topography of the subaerial landscape; a landscape that is even more accentuated in the marine realm. We test the ice sheet models of Hubbard (1999) and Golledge et al., (2008) as well as the limits of Bennett and Boulton, (1993) and Bradwell et al., (2008), along the west coast of Scotland. Here we present a new multibeam bathymetric survey and associated vibrocore samples from the Inner Sound of Sleat (S. Skye) and adjacent Lochs Hourn and Nevis. Multibeam mapping has revealed moraines and glacial channels associated with the retreat of ice, assumed to be of Younger Dryas stadial age (13-11.7 ka BP). The post-glacial sediment records of Lochs Hourn and Nevis suggest a dynamic glaciomarine environment, with sea-level change and sediment supply strongly influencing the depositional regime.

 

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