Abstract

Pre-Badcallian layered basic/ultrabasic metaigneous sheets have been used as marker horizons to determine the large scale structure of the region between Badcall and Loch Laxford. The principal structure in the vicinity of the Laxford Front is a large scale overturned synform, occupied by supracrustal rocks, which is older than or contemporaneous with the phase of granulite-facies metamorphism which ended c. 2800 Ma ago. Late Scourian and Laxfordian structures modified the early Scourian structures but are shown to be less influential south of Loch Laxford than previously suggested. The structural evolution of the area is interpreted in terms of progressive dextral transcurrent displacement acting along the Laxford Front since at least the end of the granulite-facies metamorphism.

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