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1 British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA
2Department of Geology, University of Edinburgh, West Mains Road, Edinburgh EH93JW
3British Geological Survey, 154 Clerkenwell Road, London EClR 5DU
This paper examines the evidence for basement structures of predominantly non-Caledonoid trend which appear to have influenced the development of the Dalradian belt in Scotland. A number of domains or blocks separated by dominantly trans-Caledonoid lineaments are recognized on the basis of geophysical, stratigraphical and geochemical patterns. These are thought to reflect fault-bounded depositional basins controlled by basement lineaments during the extensional phases of the Caledonian 'orogeny'. In addition the recognition of a number of these domains and lineaments in the structural, metamorphic and igneous data-sets for the Dalradian belt, shows the continuing influence of these basement controlled features throughout the compressional and uplift phases of the orogenesis.
A possible tectonic model is proposed which envisages the depositional basins forming in a setting dominated by Caledonoid trending transcurrent faults and a major pull-apart basin forming on a trans-Caledonoid axis.
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