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Lewisian Gneiss

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Journal Article
Published: 29 June 2017
Scottish Journal of Geology (2017) 53 (2): 41-52.
... an Archaean tonalitic gneiss xenolith, hosted within a Palaeoproterozoic mafic dyke in the Lewisian Gneiss Complex of NW Scotland to show how xenoliths in dykes may preserve signatures of early tectonothermal events. The Archaean tonalite–trondhjemite–granodiorite (TTG) gneisses of the Lewisian Gneiss Complex...
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Journal Article
Published: 01 November 2013
Scottish Journal of Geology (2013) 49 (2): 93-103.
...John M. MacDonald; Kathryn M. Goodenough Synopsis The Lewisian Gneiss Complex (LGC) of NW Scotland largely comprises Archaean tonalite–trondhjemite–granodiorite (TTG) gneisses variably reworked in the Palaeoproterozoic. One form of this heterogeneous reworking is the formation of major shear zones...
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Journal Article
Published: 01 September 2005
Journal of the Geological Society (2005) 162 (5): 893-895.
... – 1030 . Friend , C.R.L. & Kinny , P.D. 2001 . A reappraisal of the Lewisian Gneiss Complex: geochronological evidence for tectonic assembly of disparate terranes in the Proterozoic . Contributions to Mineralogy and Petrology , 142 , 198 – 218 . Friend , C.R.L. &...
Journal Article
Published: 01 January 2005
Journal of the Geological Society (2005) 162 (1): 175-186.
...P.D. Kinny; C.R.L. Friend; G.J. Love Abstract The current nomenclature for the Lewisian Gneiss Complex has evolved from lithological and structural correlations made prior to any dating. Initial (flawed) geochronological studies gave some names an apparent chronological standing but, as work...
FIGURES
Series: GSA Memoirs
Published: 01 January 1969
DOI: 10.1130/MEM115-p317
... The banded Lewisian gneisses of Mingulay, with minor amphibolites, show the effects of at least five phases of folding and related deformation. The formation of the banding in the gneisses is associated with the earliest recognized phase of deformation during which the main metamorphic...
Journal Article
Published: 01 January 1961
Geological Magazine (1961) 98 (1): 88.
...Alex J. Boyd; J. M. Crichton Abstract Reports the occurrence of copper minerals in Lewisian gneiss at Clachtoll bay, near Stoer, northwest Scotland. Brochantite, malachite, chalcocite, covellite, and bornite are the minerals reported. GeoRef, Copyright 2004, American Geological Institute...
Image
Location maps: ( a ) outcrop of the <b>Lewisian</b> <b>Gneiss</b> Complex (LGC) in NW Sco...
Published: 29 June 2017
Fig. 1. Location maps: ( a ) outcrop of the Lewisian Gneiss Complex (LGC) in NW Scotland, inset map showing location in the wider British and Irish isles; ( b ) location of the locality investigated in this study relative to the major geological structure in the area, the Laxford Shear Zone; ( c
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( a ) Map showing the outcrop area of the <b>Lewisian</b> <b>Gneiss</b> Complex (LGC) and...
Published: 01 November 2013
Fig. 1. ( a ) Map showing the outcrop area of the Lewisian Gneiss Complex (LGC) and the location of major shear zones. The inset map shows the location of the LGC in the UK. ( b ) Summary geology of the Isle of Barra, after IGS map sheet Uist and Barra (South) (1981).
Image
(a) Strandflat on Tiree developed in <b>Lewisian</b> <b>gneiss</b> (see  Fig. 1 ). The pl...
Published: 16 November 2012
Figure 3. (a) Strandflat on Tiree developed in Lewisian gneiss (see Fig. 1 ). The platform is everywhere ice-moulded and mantled by Holocene dunes, machair and raised beach gravels. At two locations, former gneiss ‘islands’ (middle distance and foreground) protrude
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Sketch map of the <b>Lewisian</b> <b>Gneiss</b> Complex of NW Scotland (after  Kinny  et ...
Published: 01 September 2008
Fig. 1.  Sketch map of the Lewisian Gneiss Complex of NW Scotland (after Kinny et al . 2005 ) showing the division of units into ‘terranes’ according to the model of Friend & Kinny (2001) . The areas underlain by grey shading are inferred in this study to have a similar crustal evolution
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Sketch map of the <b>Lewisian</b> <b>Gneiss</b> Complex depicting the positions of the pr...
Published: 01 January 2005
Fig. 1.  Sketch map of the Lewisian Gneiss Complex depicting the positions of the proposed component terranes. Inset shows the location of the Complex in NW Scotland. ST, Sole Thrust of the Moine Thrust Zone; MT, Moine Thrust; OHFZ, Outer Hebrides Fault Zone; SZ, shear zone.
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Deformed and contorted banding in migmatitic amphibolitic <b>Lewisian</b> <b>gneiss</b> e...
Published: 01 January 2003
Fig. 2.  Deformed and contorted banding in migmatitic amphibolitic Lewisian gneiss east of Priomh-lochs (GR NM 3713 9862). This is especially evident in the region of the hammer. The fine veins of felsic material (arrowed) cutting the earlier migmatitic structures should be noted. These later
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Photomicrographs of textures developed in the amphibolitic <b>Lewisian</b> <b>gneiss</b>....
Published: 01 January 2003
Fig. 4.  Photomicrographs of textures developed in the amphibolitic Lewisian gneiss. ( a ) The onset of hornblende breakdown is marked by fine-grained Fe-oxides along cleavage traces and a fine-grained aggregate of pyroxene, magnetite and biotite at the margins of the amphibole grains. Sample
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Maps of the two areas of <b>Lewisian</b> <b>gneiss</b> shown in outline in  Figure 1 : ( ...
Published: 01 January 2003
Fig. 5.  Maps of the two areas of Lewisian gneiss shown in outline in Figure 1 : ( a ) the Fiachanis region; ( b ) the Priomh-lochs region. The fine numbered lines are topographic contours. The numbers refer to temperatures obtained using two-pyroxene thermometry (see text for details
Journal Article
Published: 17 May 2019
Journal of the Geological Society (2019) jgs2019-017.
... of the igneous protoliths of the complex c. 2746–2726 Ma, at a later time than most of the Archaean protoliths of the Lewisian Gneiss Complex of mainland Scotland. Calc-alkaline geochemistry of the Uyea Gneiss Complex indicates arc-affinity and a strong genetic kinship among the mafic and felsic components...
Journal Article
Journal: Economic Geology
Published: 01 November 1987
Economic Geology (1987) 82 (7): 1695-1709.
...: Lewisian gneisses in the northwest and late Proterozoic, upper crustal rocks in the southeast. That the northwestern end member of the Irish Pb-mixing trend is ultimately Lewisian is demonstrated by the concordance of the Irish Pb isotope trend with the trends defined in Proterozoic to Tertiary rocks...
Journal Article
Published: 01 September 2004
Journal of the Geological Society (2004) 161 (5): 837-848.
...A.J. Mason; S. Temperley; R.R. Parrish Abstract The South Harris Complex is a domain of largely Palaeoproterozoic rocks within the late Archaean, tonalite–trondhjemite–granodiorite (TTG)-dominated Lewisian gneisses of the Outer Hebrides, NW Scotland. The complex is distinguished by a high...
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Journal Article
Published: 27 February 2009
Geological Magazine (2009) 146 (3): 382-399.
...ROMAIN MEYER; GRAEME R. NICOLL; JAN HERTOGEN; VALENTIN R. TROLL; ROBERT M. ELLAM; C. HENRY EMELEUS Abstract Sr and Nd isotope ratios, together with lithophile trace elements, have been measured in a representative set of igneous rocks and Lewisian gneisses from the Isle of Rum in order to unravel...
Journal Article
Published: 01 July 2008
Journal of the Geological Society (2008) 165 (4): 807-815.
...C.R.L. FRIEND; R.A. STRACHAN; P.D. KINNY Abstract Basement gneiss inliers within the Scottish Caledonides have been conventionally correlated with the Archaean Lewisian Gneiss Complex of the Caledonian foreland. Alternatively, the inliers could represent allochthonous terranes accreted to Laurentia...
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Journal Article
Published: 01 October 2014
Scottish Journal of Geology (2014) 50 (2): 143-158.
...Claire A. McAteer; J. Stephen Daly; Michael J. Flowerdew; Martin J. Whitehouse; Niamh M. Monaghan Synopsis Most clast lithologies within the basal conglomerate of the Iona Group, exposed on Iona, Inner Hebrides, SW Scotland, resemble the adjacent Archaean–Palaeoproterozoic Lewisian Gneiss Complex...
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