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The role of the Highland Border Ophiolite in the ~ 470 Ma Grampian Event, Scotland

Department of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK

^* Email: geoff.tanner{at}virgin.net

Field and petrological studies of the Highland Border Ophiolite demonstrate that it was obducted onto the Neoproterozoic–Ordovician rocks of the Dalradian block, and not emplaced against them by post-orogenic strike-slip movement. It was welded onto the upper, southward-younging limb of the already recumbent Tay Nappe (D1), and deformed by the Downbend Antiform (D4). However, its emplacement was not accompanied by significant internal deformation of the Dalradian block. As the ophiolite is correlated with those at Clew Bay, Tyrone and Shetland, this result will necessitate complete revision of the current model for basin closure on the southeastern margin of Laurentia.

Key Words: Ordovician • ophiolite • obduction • Dalradian

This article has been cited by other articles:

				W. G. Henderson, P. W. G. Tanner, and R. A. Strachan The Highland Border Ophiolite of Scotland: observations from the Highland Workshop field excursion of April 2008 Scottish Journal of Geology, June 1, 2009; 45(1): 13 - 18. [Abstract] [PDF]

				G. TANNER Tectonic significance of the Highland Boundary Fault, Scotland Journal of the Geological Society, September 1, 2008; 165(5): 915 - 921. [Abstract] [Full Text] [PDF]

				D. Flinn The Dalradian rocks of Shetland and their implications for the plate tectonics of the northern Iapetus Scottish Journal of Geology, November 1, 2007; 43(2): 125 - 142. [Abstract] [PDF]