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Inter-relationship of igneous activity and thrusting in Assynt: excavations at Loch Borralan

1983; Zoological Society of London; Volume: 19; Issue: 1 Linguagem: Inglês

10.1144/sjg19010059

2041-4951

Ian Parsons, Alan McKirdy,

Paleontology and Stratigraphy of Fossils

Synopsis The western margin of the Loch Borralan alkaline complex is bounded, in part, by Cambrian quartzites mapped (in poorly exposed ground) as forming part of the Cam Loch klippe, and therefore lying above the Ben More thrust. Excavations show that these quartzites are not in thrust relationship to the igneous rocks, but that the igneous types, melanite-nepheline syenites and pyroxenites, are intruded into them. The simplest interpretation is that the main movements on the Ben More thrust were complete before the emplacement of the Loch Borralan complex.