File:EGS MOI Fig 14 05.jpg

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description {{|1=(a) Plan view of shear fabrics within hornblende gneisses at Locality 14.7A [NH 773 627]. Syn-metamorphic and later brittle shear fabrics demonstrate sinistral offsets. (b) Plan view of amphibolite-grade shear fabrics. A sinistral sense of shear is indicated by geometry of the sigmoidal vein in the lower middle section of photograph. (c) Foliated microgranite at Locality 14.7B [NH 772 626] showing well-developed feldspar augen indicating sinistral shearing. (d) ? Shear banding within granite sheet at Locality 14.7B. Geometry of shear fabrics is highlighted in right-hand image and is suggestive of sinistral shear. (e) White foliated leucogranite at Locality 14.7C [NH 769 621] with sheared muscovite rich core and development of quartz&feldspar augen where muscovite envelopes porphyroclasts. (f) ? Detail of leucogranite vein at Locality 14.7C. Geometry of synthetic shears within sheared core indicate dextral shearing. [Inset: Evidence of pressure solution (impacting of muscovite) in top left and bottom right quadrants implies dextral shear.] From: Fig. 14.5.Strachan, Rob et al. Editors. 2010. A geological excursion guide to the Moine geology of the Northern Highlands of Scotland. Edinburgh: Geological Society of Edinburgh and Geological Society of Glasgow}}
source Edinburgh Geological Society
author Edinburgh Geological Society


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