Some structural features of the Caledonian granitic complex at Strontian, Argyllshire

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Abstract
Synopsis: This complex consists of two main units—a mass of granodioritic rock, which has a non-porphyritic, tonalitic margin grading into a porphyritic core, and contains planar, and locally linear, flow structures, and a mass of virtually structureless biotite granite, which is bordered by a zone of vein-like apophyses. It is surrounded by a zone approximately three-quarters of a mile wide within which the country rock structures have been deflected and deformed. Fractures exploited by the biotite granite, and at various times by aplites and pegmatites, show similarities in orientation. Joints show a different orientation pattern and appear to be largely unrelated in origin to the complex. It is suggested that, firstly the granodioritic, and then the biotite granite magmas ascended within the crust to form stock-like bodies, and that in the former case a tongue-like extension to the north occurred, possibly under tectonic control.

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