A detailed structural study of the northern portion of the Strontian Granitic Complex
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Previous work on the Strontian complex has been substantiated by the present investigation, and the knowledge of the structures in the rocks of the complex, and in the adjoining Moine schists end gneisses has been considerably augmented. It has been shown that a planar structure occurs throughout two of the three main unite of the complex - the tonalite and the porphyritic granodiorite. A linear structure also occurs in these rocks in a restricted area it the north. These structures largely conform to a simple pattern common to both tonalite and granodiorite. In the northern part of the complex, the granitic veins end the joints both appear to possess distinctive patterns of orientation, which prevail throughout this northern region. These patterns show little similarity to each other, and appear to be largely unrelated to the orientation of the foliation and lineation in the tonalite and granodiorite in this area. The formation of the complex appears to have been attended by considerable shearing and folding in the Moine country rocks which lie within half a mile of the complex. The overall pattern of the structures within the complex and the adjoining areas of country rock, appears to be distinctive, and does not closely resemble the structural pattern within and around other granitic complexes. It is suggested that the two main units of the complex with a common internal structural pattern have been formed by the more or less simultaneous intrusion of two magmas, and that these magmas were probably emplaced by a process which involved forcible intrusion, and may have under the control of forces associated with the Caledonian orogeny.
Thesis, PhD Doctor of Philosophy
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