Abstract

The Ratagain granite complex (425 ± 3 Ma) was emplaced adjacent to the Strathconan Fault, an important member of the Great Glen fault system, and was deformed by sinistrpl shear associated with this fault just prior to its complete crystallization. It was deformed again by low temperature sinistrral mylonite and breccia zones penecontemporaneously with the regional minette dyke swam (410-395 Ma). Very little evidence is seen in the complex of deformation in the high temperature/post-crystsllization intend, and it is concluded that Caledonian sinistral motion on the Strathconan Fault occurred in two distinct phases: Mid-Siurian (Wenlock) and Early Devonian.

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