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Journal Article

The Sgurr Beag nappe: A reassessment of the stratigraphy and structure of the Northern Highland Moine Available to Purchase

ALAN M. ROBERTS, ROBIN A. STRACHAN, ANTHONY L. HARRIS, DAVID BARR, ROBERT E. HOLDSWORTH
Journal: GSA Bulletin
Published: 01 May 1987
GSA Bulletin (1987) 98 (5): 497–506.
DOI: https://doi.org/10.1130/0016-7606(1987)98<497:TSBNAR>2.0.CO;2
... in the Northern Highlands which lie above the Sgurr Beag thrust, that is, those previously assigned to the Glenfinnan or Loch Eil divisions, should be referred to a single tectonostratigraphic unit, the Sgurr Beag nappe. The Glenfinnan and Loch Eil divisions have the status of lithostratigraphic groups within...
View PDF for article title, The <span class="search-highlight">Sgurr</span> <span class="search-highlight">Beag</span> <span class="search-highlight">nappe</span>: A reassessment of the stratigraphy and structure of the Northern Highland Moine
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Journal Article

Provenance of the Moine Supergroup of NW Scotland: evidence from geochronology of detrital and inherited zircons from (meta)sedimentary rocks, granites and migmatites Available to Purchase

C.R.L. Friend, R.A. Strachan, P.D. Kinny, G.R. Watt
Published: 01 March 2003
Journal of the Geological Society (2003) 160 (2): 247–257.
DOI: https://doi.org/10.1144/0016-764901-161
... that the Naver and Sgurr Beag nappes had different sediment sources and so may not correlate. The Morar Group is dominated by late Palaeoproterozoic detritus with lesser amounts of Grenville-aged detritus. The Glenfinnan and Loch Eil Groups appear to have roughly equal proportions of detritus from the two...
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View PDF for article title, Provenance of the Moine Supergroup of NW Scotland: evidence from geochronology of detrital and inherited zircons from (meta)sedimentary rocks, granites and migmatites
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Journal Article

Structure and stratigraphy of the Morar Group in Knoydart, NW Highlands: implications for the history of the Moine Nappe and stratigraphic links between the Moine and Torridonian successions Available to Purchase

M. Krabbendam, A. G. Leslie, K. M. Goodenough
Published: 17 October 2014
Scottish Journal of Geology (2014) 50 (2): 125–142.
DOI: https://doi.org/10.1144/sjg2014-002
...M. Krabbendam; A. G. Leslie; K. M. Goodenough Synopsis The Caledonian Orogen in northern Scotland comprises two major thrust nappes: the Moine and the Sgurr Beag Nappe. The Moine Nappe contains early Neoproterozoic Morar Group rocks (Moine Supergroup) and basement inliers. This paper describes...
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View PDF for article title, Structure and stratigraphy of the Morar Group in Knoydart, NW Highlands: implications for the history of the Moine <span class="search-highlight">Nappe</span> and stratigraphic links between the Moine and Torridonian successions
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Journal Article

The stable isotope (C, O, S) record of Paleoproterozoic marbles, Scotland Open Access

John Parnell, Adrian J. Boyce, Joseph G. T. Armstrong, Andrea Schito, David Muirhead
Published: 17 August 2023
Scottish Journal of Geology (2023) 59 (1-2): sjg2023-009.
DOI: https://doi.org/10.1144/sjg2023-009
... in the Laurentian Foreland, the Moine Nappe and the Sgurr Beag Nappe, over a 150 km transect across the Caledonian thrust belt. A light oxygen isotope composition distinguishes marbles that have been sheared and retrogressed by ingress of meteoric water, possibly during both Laxfordian and Caledonian orogenesis...
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View PDF for article title, The stable isotope (C, O, S) record of Paleoproterozoic marbles, Scotland
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Image
Simplified structural map of NW Scotland mainland, showing occurrence of Lomagundi–Jatuli signature in Laurentian foreland (Gairloch district), and Moine Nappe (Carr) and Sgurr Beag Nappe (Scardroy district).

Simplified structural map of NW Scotland mainland, showing occurrence of Lo... Open Access

Published: 17 August 2023
Fig. 7. Simplified structural map of NW Scotland mainland, showing occurrence of Lomagundi–Jatuli signature in Laurentian foreland (Gairloch district), and Moine Nappe (Carr) and Sgurr Beag Nappe (Scardroy district).
Image
 Probability density distribution diagram comparing analysed detrital zircons from the Loch Eil and Glen Urquhart samples of the Sgurr Beag Nappe with recently published data of Friend et al. (2003) and Cawood et al. (2003) for detrital and inherited zircons from psammite of the Glen Banchor Succession of the Grampian Highlands, from psammite of the Morar Group of the Moine Nappe, from Caledonian migmatites and granites of the Naver Nappe in North Sunderland, and from the West Highland granite gneiss and a Glenfinnan Group pelite of the Sgurr Beag Nappe. Dashed vertical lines separate boundaries of the Proterozoic and are taken at 2500 Ma, 1600 Ma, 1000 Ma and 545 Ma. n, number of analysed zircons with a probability of concordance equal to, or greater than, 0.05 (total number of analyses within the sample set is given in parentheses). It should be noted that the probability plot for the Naver Nappe is a revised version of that originally presented by Friend et al. (2003, fig. 3b). The original version accidentally included data points from the Moine Nappe. The error became apparent only during preparation of this paper.

Probability density distribution diagram comparing analysed detrital zircon... Available to Purchase

Published: 01 September 2004
Fig. 6.  Probability density distribution diagram comparing analysed detrital zircons from the Loch Eil and Glen Urquhart samples of the Sgurr Beag Nappe with recently published data of Friend et al . (2003) and Cawood et al . (2003) for detrital and inherited zircons from psammite
Image
 (a) General disposition of the nappe structures NW of the Great Glen Fault (GGF) and above the Moine Thrust (MTZ), showing the Sgurr Beag Thrust (SBT), the Naver Thrust (NT) and the Ben Hope Thrust (BHT). Horizontal lines, Moine nappe; diagonal lines, Sgurr Beag nappe; vertical lines, Naver nappe. LD, Loch Duich; F, Fannich. Small box represents Loch Naver area. (b) General geology of area around Loch Naver, central Sutherland. The regional foliation dips gently to moderately to the east or SE (see text for discussion and Fig. 2). Arrows point to the locations of the Strathnaver granite (SG), the Vagastie Bridge granite (VBG) and the Klibreck granite (KG). N, Naver basement inlier; M, Meadie basement inlier; NT, Naver Thrust; TT, Torrisdale Thrust; ST, Swordly Thrust; BK, Ben Klibreck.

( a ) General disposition of the nappe structures NW of the Great Glen Faul... Available to Purchase

Published: 01 March 2003
Fig. 1.  ( a ) General disposition of the nappe structures NW of the Great Glen Fault (GGF) and above the Moine Thrust (MTZ), showing the Sgurr Beag Thrust (SBT), the Naver Thrust (NT) and the Ben Hope Thrust (BHT). Horizontal lines, Moine nappe; diagonal lines, Sgurr Beag nappe; vertical lines
Image
 U/Pb concordia plot for detrital zircons. (a) S97/21, Morar Group, Moine Nappe, heavy mineral band, Cnoc Eilig, NC 549609; (b) S00/05, Lochailort pelite, Glenfinnan Group, Sgurr Beag Nappe; road cutting east of electricity substation, NM 771828. Data are presented as 1σ error boxes.

U/Pb concordia plot for detrital zircons. ( a ) S97/21, Morar Group, Moine ... Available to Purchase

Published: 01 March 2003
Fig. 2.  U/Pb concordia plot for detrital zircons. ( a ) S97/21, Morar Group, Moine Nappe, heavy mineral band, Cnoc Eilig, NC 549609; ( b ) S00/05, Lochailort pelite, Glenfinnan Group, Sgurr Beag Nappe; road cutting east of electricity substation, NM 771828. Data are presented as 1 σ error boxes.
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Time-space plot of age constraints on principal Neoproterozoic metasedimentary units and of tectonothermal events within the thrust sheets of the Moine Supergroup, Scotland. Numbers on data points refer to the following sources: 1—Friend et al. (2003), U–Pb zircon age of 1032 ± 12 Ma for youngest detrital grain in Morar Group, Moine Nappe; 2—Kirkland et al. (2008), U-Pb zircon age of 1022 ± 24 Ma for youngest detrital grain in Morar Group, Moine Nappe; 3—this paper, U-Pb age of 1011 ± 57 Ma for youngest detrital grain in lower psammite, Morar Group, Moine Nappe; 4—Peters (2001), U-Pb zircon age of 980 ± 4 Ma for youngest detrital grain in Morar Group, Moine Nappe; 5—this paper, U-Pb zircon age of 899 ± 51 Ma for youngest detrital grain in Glenfinnan Group, Moine Nappe; 6—Kirkland et al. (2008), U-Pb magmatic zircon overgrowth age of 842 ± 20 Ma on detrital Morar Group zircon, Moine Nappe; 7—Rogers et al. (1998), U-Pb monazite ages of 827 ± 2 Ma and 781 ± 1 Ma for the synmetamorphic Ardnish and Sgurr Breac pegmatites intrusive into Morar Group; 8—Vance et al. (1998), Sm-Nd garnet whole-rock ages of 823 ± 5 Ma and 788 ± 4 Ma for growth zones in garnet from the Morar Group; 9—this paper, U-Pb zircon age of 786 ± 7 Ma for Knoydart pegmatite, Moine Nappe; 10—Tanner and Evans (2003), U-Pb titanite age of 737 ± 5 Ma from calc-silicate pod in Morar Group, Moine Nappe; 11—Storey et al. (2004), U-Pb titanite age of 669 ± 31 Ma occurring within, and inferred to date, a shear zone between eastern and western units of the Glenelg-Attadale Inlier, which also contains Morar Group rocks; 12—Burns et al. (2004), Nd depleted mantle model age of around 1000 Ma for the Strathy Complex, possible basement assemblage to the East Sutherland Moine succession in the Naver Nappe; 13—Kinny and Strachan (2010, personal commun.), U-Pb zircon age of ca. 965 Ma for protolith to orthogneiss intrusive into Moine rocks of Naver Nappe; 14—Friend et al. (2003), U-Pb zircon age of 926 ± 68 Ma for youngest detrital grain from within the Kirtomy migmatites in East Sutherland Moine succession, Naver Nappe; 15—Kirkland et al. (2008), U-Pb zircon age of 1009 ± 22 Ma for youngest detrital grain in sample of Glenfinnan Group, Sgurr Beag Nappe; 16—Cawood et al. (2004), U-Pb zircon age of 962 ± 32 Ma for the average of four analyses from youngest detrital grain in sample of Loch Eil Group, and U-Pb zircon age of 883 ± 35 Ma for the average of two analyses from youngest detrital grain in sample of Glen Urquhart psammite, Sgurr Beag Nappe; 17—Friend et al. (2003), U-Pb zircon age of 947 ± 59 Ma for youngest detrital grain in sample of granite gneiss incorporating metasediments of the Glenfinnan Group, Sgurr Beag Nappe; 18—Cutts et al. (2010), U-Pb zircon age of 917 ± 13 Ma for youngest detrital grain from sample of Glenfinnan Group, Sgurr Beag Nappe and U-Pb zircon age of 725 ± 4 Ma and inductively coupled plasma–mass spectrometry (ICP-MS) monazite ages of 825 ± 18 Ma, 782 ± 11 Ma, and 724 ± 6 Ma for monazite from migmatites within the Glenfinnan Group, Sgurr Beag Nappe; 19—this paper, U-Pb zircon ages of 869 ± 8 Ma and 860 ± 18 Ma for Glen Doe granitic gneiss, 880 ± 7 Ma for granitic xenolith in Glen Doe metagabbro, and 742 ± 19 for metamorphic rims on zircon grains within the metagabbro; 20—U-Pb zircon ages of felsic and mafic igneous bodies emplaced into the Glenfinnan and Loch Eil groups of the Sgurr Beag Nappe give ages of 873 ± 7 Ma for the Ardgour granite gneiss (Friend et al., 1997), 873 ± 6 Ma for mafic sheets (Hyslop, 2009a), and 870 ± 20 Ma for the Fort Augustus granite gneiss (Rogers et al., 2001); 21—this paper, thermal ionization mass spectrometry (TIMS) and secondary ion mass spectrometry (SIMS) U-Pb zircons ages for samples of Sgurr Dhomhnuill phase of Ardgour granite gneiss of 863 ± 4 Ma and 852 ± 10 Ma, respectively; 22—this paper, U-Pb zircon ages for Cruachan Coille a’Chait pegmatite, Loch Cluanie of ca. 793 ± 24 Ma and 830 ± 3 Ma for pegmatite on shore of Loch Cluanie; 23—this paper, U-Pb monazite age for Carn Gorm pegmatite of 756 ± 4 Ma; 24—van Breemen et al. (1974), Rb-Sr muscovite age for Carn Gorm pegmatite of 730 ± 20 Ma; 25—Highton et al. (1999), U-Pb zircon ages of 926 ± 6 Ma for youngest detrital grain and 840 ± 11 Ma for melt crystallization and new zircon growth in Badenoch Group, and the succession is part of the sub-Grampian basement to the Dalradian Supergroup and inferred to be an equivalent to the Moine succession (Piasecki, 1980); 26—Cawood et al. (2003), U-Pb zircon age of 900 ± 17 Ma for youngest detrital grain from sample of Badenoch Group; 27—Noble et al. (1996), U-Pb monazite ages of 806 ± 3 Ma, 808 +11/–9 Ma, and 804 +13/–12 Ma for pegmatites and mylonitic rocks from the Grampian shear zone separating sub-Grampian basement and Dalradian Supergroup; 28—approximate age of 750 Ma based on Rb/Sr ages of muscovites in pegmatites from Badenoch Group (Piasecki and van Breemen, 1983, and references therein); 29—Halliday et al. (1989) and Dempster et al. (2002) have determined U-Pb zircon ages for the Tayvallich Volcanics and inferred comagmatic intrusive rocks of around 600–595 Ma. Abbreviations: DS—Dalradian Supergroup; ES—East Sutherland Moine succession; BG—Badenoch Group, sub-Grampian basement; GL—Glenfinnan and Loch Eil groups, including Glen Urquhart psammite; GF—Glenfinnan Group; MG—Morar Group; SC—Strathy complex.

Time-space plot of age constraints on principal Neoproterozoic metasediment... Open Access

Published: 01 March 2015
; 15— Kirkland et al. (2008) , U-Pb zircon age of 1009 ± 22 Ma for youngest detrital grain in sample of Glenfinnan Group, Sgurr Beag Nappe; 16— Cawood et al. (2004) , U-Pb zircon age of 962 ± 32 Ma for the average of four analyses from youngest detrital grain in sample of Loch Eil Group, and U-Pb
Image
 Number/relative probability v. age plot for the detrital and inherited zircons. (a) Moine Nappe; S97/21, Cnoc Eilig heavy mineral band; VB1, Vagastie Bridge granite. (b) Naver Nappe; combined north Sutherland migmatites, S96/8 and K94/5 (Kinny et al. 1999) and Caledonian granites; SN1, Strathnaver, and RC2122, Ben Klibreck (Kinny et al. 2002). (c) Sgurr Beag Nappe; S00/05, Lochailort pelite; RC909, RC2175 (Ardgour) and RC2184 (Fort Augustus) outcrops of the West Highland granite gneiss, combined data from Friend et al. (1997) and Rogers et al. (2001).

Number/relative probability v. age plot for the detrital and inherited zirc... Available to Purchase

Published: 01 March 2003
; SN1, Strathnaver, and RC2122, Ben Klibreck ( Kinny et al . 2002 ). ( c ) Sgurr Beag Nappe; S00/05, Lochailort pelite; RC909, RC2175 (Ardgour) and RC2184 (Fort Augustus) outcrops of the West Highland granite gneiss, combined data from Friend et al. (1997) and Rogers et al . (2001) .
Journal Article

Late-orogenic extensional tectonics at the NW margin of the Caledonides in Scotland Available to Purchase

G. J. Potts, R. H. Hunter, A. L. Harris, F. M. Fraser
Published: 01 November 1995
Journal of the Geological Society (1995) 152 (6): 907–910.
DOI: https://doi.org/10.1144/GSL.JGS.1995.152.01.04
... foliations dip gently towards the ESE and display a down-dip grain shape lineation. The Moine Thrust, carrying the Moine Nappe, is the westernmost, lowest and youngest of three major thrusts (Fig. 1), the others being the Knoydart and Sgurr Beag (highest and oldest) thrusts, carrying respectively...
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(A) Simplified geology map of the Albany-Fraser orogen with the sedimentary units of the Arid and Barren Basins (after Spaggiari and Tyler, 2014). N—Northampton Complex; L—Leeuwin Complex; PO—Patterson Orogen; MP—Musgrave Province; AFO—Albany-Fraser Orogen; SRF—Stirling Range Formation; MBG—Mount Barren Group; MRF—Mount Ragged Formation; WR—Woodline Formation. (B) Simplified map showing the extent of the Grenville orogen (sensu stricto) in North America (after Rivers et al., 2012). (C) Simplified paleogeographic map of the Mesoproterozoic to Neoproterozoic North Atlantic region (after Cawood et al., 2010). Abbreviations: GT—Grampian terrane; M—Moine succession (includes Moine, Naver, and Sgurr Beag nappes); Hf—Hebridean foreland; K—Krummedal succession; Pm—Putomayo (position of the Putomayo after Ibanez-Mejia et al., 2011); Rb—Rockall Bank; Sa/So—Svaerholt and Sørøy successions; Sh—Shetland Islands; Sn—Sveconorwegian orogen; Ss—Sunsas orogen; Se—Eastern terrane of Svalbard; Sc—Central terrane of Svalbard; Sw—Western terrane of Svalbard (includes the Southwestern and Northwestern terranes).

(A) Simplified geology map of the Albany-Fraser orogen with the sedimentary... Open Access

Published: 01 February 2016
region (after Cawood et al., 2010 ). Abbreviations: GT—Grampian terrane; M—Moine succession (includes Moine, Naver, and Sgurr Beag nappes); Hf—Hebridean foreland; K—Krummedal succession; Pm—Putomayo (position of the Putomayo after Ibanez-Mejia et al., 2011 ); Rb—Rockall Bank; Sa/So—Svaerholt and Sørøy
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Neoproterozoic reconstruction of eastern Laurentia, Baltica, and northern Amazonia prior to opening of Iapetus Ocean. Baltica is shown in both its pre–1265 Ma (gray shading, rotated anticlockwise with respect to Laurentia by 44.9° about Euler pole at 45.0°N, 7.5°E) and post–1000 Ma (colored, rotated clockwise with respect to Laurentia by 59.2° about Euler pole at 75.8°N, 95.8°W) positions. Rotation of Baltica created Asgard Sea. Disruption of Svalbard by series of Caledonian strike-slip faults into Western (Sw), Central (Sc), and Eastern (Se) terranes follows Harland (1997). Kalak nappes, currently located in northwest Baltica, and containing Svaerholt and Sørøy successions, are thought to have originated along Laurentian margin, but position is unconstrained. Red blocks correspond to sedimentary and deformational sequences associated with Renlandian orogenic cycle of Valhalla orogen, and yellow blocks correspond to Knoydartian cycle. Abbreviations: GT—Grampian terrane; M—Moine succession (includes Moine, Naver, and Sgurr Beag nappes); Hf—Hebridean foreland; K—Krummedal succession; Rb—Rockall Bank; Sa/So—Svaerholt and Sørøy successions; Sh—Shetland Islands; Sn—Sveconorwegian orogen; Ss—Sunsas orogen; Se—Eastern terrane of Svalbard (includes Nordaustlandet terrane of Gee and Teben'kov, 2004); Sc—Central terrane of Svalbard; Sw—Western terrane of Svalbard (includes the Southwestern and Northwestern terranes of Gee and Teben'kov, 2004).

Neoproterozoic reconstruction of eastern Laurentia, Baltica, and northern A... Available to Purchase

Published: 01 February 2010
orogen, and yellow blocks correspond to Knoydartian cycle. Abbreviations: GT—Grampian terrane; M—Moine succession (includes Moine, Naver, and Sgurr Beag nappes); Hf—Hebridean foreland; K—Krummedal succession; Rb—Rockall Bank; Sa/So—Svaerholt and Sørøy successions; Sh—Shetland Islands; Sn—Sveconorwegian
Journal Article

Major low-angle fault displacement measured by matching amphibolite chemistry—An example from Scotland Available to Purchase

John A. Winchester
Journal: Geology
Published: 01 September 1985
Geology (1985) 13 (9): 604–606.
DOI: https://doi.org/10.1130/0091-7613(1985)13<604:MLFDMB>2.0.CO;2
...John A. Winchester Abstract Discriminant trace-element geochemistry has been used to match early amphibolite suites in the Caledonide nappes lying below and above the Sgurr Beag Slide, a major low-angle dislocation in northwest Scotland. This method may be attempted in any structurally complex area...
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Late Precambrian U–Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland Available to Purchase

P.W.G. Tanner, J.A. Evans
Published: 01 July 2003
Journal of the Geological Society (2003) 160 (4): 555–564.
DOI: https://doi.org/10.1144/0016-764902-080
... with Precambrian nappe structures (D 1 + D 2 ) being overprinted by Caledonian deformation accompanied by greenschist- to amphibolite-facies regional metamorphism (II). In this model, ductile thrusting (Sgurr Beag and Knoydart thrusts) occurred during the second amphibolite-facies event, followed by the formation...
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View PDF for article title, Late Precambrian U–Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland
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Field relationships and emplacement of the Caledonian Ross of Mull Granite, Argyllshire Available to Purchase

A. Zaniewski, R. J. Reavy, A. L. Harris
Published: 01 November 2006
Scottish Journal of Geology (2006) 42 (2): 179–189.
DOI: https://doi.org/10.1144/sjg42020179
... that: (a) the Sound of Iona Fault and the associated mylonites on Iona are part of a steeply inclined extensional fault throwing down to the ESE, bringing high grade Sgurr Beag or Knoydart Nappe Moine rocks to the same erosion level as the foreland units on Iona; and (b) one of the main Caledonian thrusts must extend...
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View PDF for article title, Field relationships and emplacement of the Caledonian Ross of Mull Granite, Argyllshire
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Lu–Hf and Sm–Nd dating of metamorphic garnet: evidence for multiple accretion events during the Caledonian orogeny in Scotland Available to Purchase

A. F. Bird, M. F. Thirlwall, R. A. Strachan, C. J. Manning
Published: 01 March 2013
Journal of the Geological Society (2013) 170 (2): 301–317.
DOI: https://doi.org/10.1144/jgs2012-083
.... 3. Thin section photographs in plane-polarized light of samples from the Sgurr Beag and Naver nappes. ( a ) AB07-05; ( b ) AB07-14; ( c ) AB07-21; ( d ) AB07-22. The sample was obtained from one of a series of elongate pods, each several metres long. These probably resulted from...
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View PDF for article title, Lu–Hf and Sm–Nd dating of metamorphic garnet: evidence for multiple accretion events during the Caledonian orogeny in Scotland
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Figure 1. Sketch map (A) and cross section (B) of northern Scotland showing positions of main allochthonous nappes. Samples DC5 and DC10, located near base of Naver nappe, are indicated. Inset shows location of detailed sketch. Abbreviations: ST—Sole thrust, MT—Moine thrust, BHT—Ben Hope thrust, NT—Naver thrust, PBT—Port Beag thrust, KT—Kirtomy thrust, SBT—Sgurr Beag thrust.

Figure 1. Sketch map (A) and cross section (B) of northern Scotland showing... Available to Purchase

Published: 01 June 2000
—Naver thrust, PBT—Port Beag thrust, KT—Kirtomy thrust, SBT—Sgurr Beag thrust.
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Discussion of the structural setting and tectonic significance of the Glen Dessary Syenite, Inverness-shire Available to Purchase

Published: 01 August 1985
Journal of the Geological Society (1985) 142 (4): 713–718.
DOI: https://doi.org/10.1144/gsjgs.142.4.0713
... zone we do not recognize any structures, and certainly not major folds, associated with the ductile thrust. It is more likely that, following the emplacement of the Sgurr Beag Nappe (Glenfin- nan and Loch Eil divisions) onto the Morar Division by the Sgurr Beag ductile thrust, the only structures...
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Tectonostratigraphy of the Moine Supergroup: a synthesis Available to Purchase

N. J. SOPER, A. L. HARRIS, R. A. STRACHAN
Published: 01 February 1998
Journal of the Geological Society (1998) 155 (1): 13–24.
DOI: https://doi.org/10.1144/gsjgs.155.1.0013
... of the Geological Society, London 1983 140 883 892 Roberts A.M. Strachan R.A. Harris A.L. Barr D. Holdsworth R.E. The Sgurr Beag nappe: a reassessment of the stratigraphy and structure of the northern Highland Moine Geological Society of America Bulletin 1987 98 497 506...
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