Fabric and microstructural analysis of the Loch Borralan pluton, Northwest Highlands, Scotland
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The Hart Lake-Byers Lake granite and Folly Lake gabbro make up a composite pluton emplaced along the Rockland Brook fault in latest Devonian time. Mafic enclaves are common in granite veins cutting gabbro near the contact of the major granite and gabbro bodies. Three types of enclaves are distinguished: (I) þchocolate-barþ enclaves with angular margins resulting from extensional disruption; (II)ellipsoidal enclaves forming from type I by shear deformation in granitic dykes; and (III) large plastically deformed stoped rafts of gabbro. Deformation of ellipsoidal enclaves decreases northward from the Rockland Brook fault.
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The Zippa Mountain igneous complex comprises three petrologically distinct latest Triassic intrusions: the Zippa Mountain syenite-pyroxenite, Mount Raven diorite, and Seraphim Mountain granite plutons. Zippa Mountain pluton, a concentrically-zoned, silica undersaturated, bimodal mafic and felsic intrusion intrudes Paleozoic and Triassic rocks of Stikinia and is dominated by syenite, melasyenite, and pyroxenite. Pyroxenite occurs at the pluton margins and grades from mafic syenite to a core of K-feldspar syenite. Aegirine-augite, zoned K-feldspar, biotite, vishnevite-cancrinite, and melanite (Ti-bearing andradite) are major igneous phases accompanied by accessory titanite and apatite. Vishnevite-cancrinite, a complex sulphate- and carbonate-bearing aluminosilicate solid-solution phase, commonly replaced nepheline or leucite. Trachytic K-feldspar and aligned aegirine-augite crystals and vishnevite-cancrinite-, melanite-, and pyroxene-rich layers in the syenite and pyroxenite define a widespread fabric which, with associated petrographic textures, are interpreted to be cumulate features.
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