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Ben Loyal Intrusion

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Journal Article

The influence of country rock structural architecture during pluton emplacement: the Loch Loyal syenites, Scotland Available to Purchase

R. E. HOLDSWORTH, M. A. McERLEAN, R. A. STRACHAN
Published: 01 February 1999
Journal of the Geological Society (1999) 156 (1): 163–175.
DOI: https://doi.org/10.1144/gsjgs.156.1.0163
...R. E. HOLDSWORTH; M. A. McERLEAN; R. A. STRACHAN Abstract The late Caledonian Loch Loyal syenites comprise three related, but geographically separate, composite intrusions: the Ben Loyal, Ben Stumanadh and Cnoc nan Cuilean bodies. They were emplaced (c. 426 Ma) into Moine and Lewisian rocks...
View PDF for article title, The influence of country rock structural architecture during pluton emplacement: the Loch <span class="search-highlight">Loyal</span> syenites, Scotland
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Journal Article

The structure and petrology of the Cnoc nan Cuilean Intrusion, Loch Loyal Syenite Complex, NW Scotland Available to Purchase

HANNAH S. R. HUGHES, KATHRYN M. GOODENOUGH, ABIGAIL S. WALTERS, MICHAEL MCCORMAC, A. GUS GUNN, ALICJA LACINSKA
Published: 22 February 2013
Geological Magazine (2013) 150 (5): 783–800.
DOI: https://doi.org/10.1017/S0016756812000957
... into three separate intrusions (Ben Loyal, Beinn Stumanadh and Cnoc nan Cuilean). Mapping of the Cnoc nan Cuilean intrusion shows two main zones: a Mixed Syenite Zone (MZ) and a Massive Leucosyenite Zone (LZ), with a gradational contact. The MZ forms a lopolith, with multiple syenitic lithologies, including...
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View PDF for article title, The structure and petrology of the Cnoc nan Cuilean <span class="search-highlight">Intrusion</span>, Loch <span class="search-highlight">Loyal</span> Syenite Complex, NW Scotland
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Journal Article

Syn-orogenic alkaline magmatism and its relationship to the Moine Thrust Zone and the thermal state of the Lithosphere in NW Scotland Available to Purchase

A. N. HALLIDAY, M. AFTALION, I. PARSONS, A. P. DICKIN, M. R. W. JOHNSON
Published: 01 August 1987
Journal of the Geological Society (1987) 144 (4): 611–617.
DOI: https://doi.org/10.1144/gsjgs.144.4.0611
... age data for the Loch Borralan intrusion (430 f 4 Ma), for the main movements on the Ben More thrust plane. A detailed history of the main tectonic and igneous events in the Moine Thrust Zone is tabulated. Zircons from the undeformed Cnoc-nan-Cuilean syenite, emplaced in Moine rocks near Loch Loyal...
View PDF for article title, Syn-orogenic alkaline magmatism and its relationship to the Moine Thrust Zone and the thermal state of the Lithosphere in NW Scotland
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Figure 2.

Geology of the Loch Loyal Syenite Complex based on King ( 1942 ), Robertson... Available to Purchase

Published: 22 February 2013
mapping presented here. Three individual intrusions: Ben Loyal (BL), Beinn Stumanadh (BS) and Cnoc nan Cuilean (CnC). Faults include the Loch Loyal Fault and two faults (F1 and F2) within the Cnoc nan Cuilean intrusion. Surrounding country rock foliations
Image
Simplified geological map of the Northern Highlands, showing the main structures and intrusions. Major thrusts: MT, Moine Thrust; BHT, Ben Hope Thrust; NT, Naver Thrust; SBT, Sgurr Beag Thrust. Alkaline plutons: GDP, Glen Dessarry Pluton; LBP, Loch Borralan Pluton; LAP, Loch Ailsh Pluton; LLSC, Loch Loyal Syenite Complex.

Simplified geological map of the Northern Highlands, showing the main struc... Available to Purchase

Published: 01 January 2011
Fig. 1. Simplified geological map of the Northern Highlands, showing the main structures and intrusions. Major thrusts: MT, Moine Thrust; BHT, Ben Hope Thrust; NT, Naver Thrust; SBT, Sgurr Beag Thrust. Alkaline plutons: GDP, Glen Dessarry Pluton; LBP, Loch Borralan Pluton; LAP, Loch Ailsh Pluton
Image
Regional geology of north Sutherland (modified from British Geological Survey 1997, 2002, 2003, 2004a, b). Inset map shows location in northern Scotland. Abbreviations of structures: AT, Achininver Thrust; ACT, Achness Thrust; BBSZ, Ben Blandy Shear Zone; BHT, Ben Hope Thrust; LRT, Lochan Riabach Thrust; MT, Moine Thrust; NT, Naver Thrust; PMT, Port Mor Thrust; ST, Swordly Thrust; SKT, Skinsdale Thrust; SoT, Sole Thrust; TT, Torrisdale Thrust. Abbreviations of intrusions: CM, Creag Mhor Quartz Monzodiorite; CSG, Creag Suilbheag Granite; G, Grudie Granite; GSM, Glen Scaddle Metagabbro; HG, Helmsdale Granite; KG, Klibreck Granite; LA, Loch Ailsh Syenite; LB, Loch Borrolan Syenite; LL, Loch Loyal Syenite Complex; LS, Loch Shin Granite; RIC, Rogart Igneous Complex; ROM, Ross of Mull Granite; SHG, Strath Halladale Granite; SNG, Strathnaver Granite; VBG, Vagastie Bridge Granite.

Regional geology of north Sutherland (modified from British Geological Sur... Available to Purchase

Published: 12 June 2020
Fig. 2. Regional geology of north Sutherland (modified from British Geological Survey 1997 , 2002 , 2003 , 2004 a , b ). Inset map shows location in northern Scotland. Abbreviations of structures: AT, Achininver Thrust; ACT, Achness Thrust; BBSZ, Ben Blandy Shear Zone; BHT, Ben Hope
Image
Summary of geochronology data across northernmost Scotland. (a) All recently published geochronology of high-temperature metamorphic minerals. Sampling locations for all previous studies are indicated in Figure 1b using the same labelling system. Importantly, the Scandian age estimates of Goodenough et al. (2011) for alkaline intrusions (G) in the Assynt region of the Moine thrust zone are older than most other Scandian ages, including both the Ben Loyal alkaline intrusive complex (W) in the Ben Hope thrust sheet and the ages reported in this study from Moine metasedimentary rocks in the Naver nappe. Note that the error bars for the ages of Goodenough et al. (2011) are smaller than the plotted symbol. The c. 450 Ma Goodenough et al. (2011) age is from the Glen Dessary Syenite (Fig. 1a) 120 km SW of the Naver nappe. (b) Summary of all temperature–time data from this study, in addition to the early Emsian (407–403 Ma) depositional age of the Devonian Old Red Sandstone conglomerates (Wellman 2015) deposited on top of the high-grade rocks in the Naver and Skinsdale nappes. To cool to surface temperatures by the time of deposition, an increase in the cooling rate, relative to that calculated from our data, is required. Data from our study correlate well with previously described distinct metamorphic events: the Grampian, Grampian II and Scandian phases. Applying the monazite–xenotime thermometer to Grampian II monazite implies a minimum temperature of c. 500°C during this event.

Summary of geochronology data across northernmost Scotland. ( a ) All recen... Free

Published: 28 May 2019
estimates of Goodenough et al. (2011) for alkaline intrusions (G) in the Assynt region of the Moine thrust zone are older than most other Scandian ages, including both the Ben Loyal alkaline intrusive complex (W) in the Ben Hope thrust sheet and the ages reported in this study from Moine metasedimentary
Journal Article

Discussion on the influence of country rock structural architecture during pluton emplacement: the Loch Loyal syenites, Scotland Available to Purchase

Published: 01 December 1999
Journal of the Geological Society (1999) 156 (6): 1237–1239.
DOI: https://doi.org/10.1144/gsjgs.156.6.1237
... units adjacent to the Ben Loyal and Ben Stumanadh syenites (localities given on pp. 168 9 of Holdsworth et al. 1999a and also at [NC 5930 4669]) appears to post-date all tectonic fabrics in the country rocks, including F3 crenulations. The general lack of country rock lithologies suitable...
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Journal Article

Timing of regional deformation and development of the Moine Thrust Zone in the Scottish Caledonides: constraints from the U–Pb geochronology of alkaline intrusions Available to Purchase

K.M. Goodenough, I. Millar, R.A. Strachan, M. Krabbendam, J.A. Evans
Published: 01 January 2011
Journal of the Geological Society (2011) 168 (1): 99–114.
DOI: https://doi.org/10.1144/0016-76492010-020
...Fig. 1. Simplified geological map of the Northern Highlands, showing the main structures and intrusions. Major thrusts: MT, Moine Thrust; BHT, Ben Hope Thrust; NT, Naver Thrust; SBT, Sgurr Beag Thrust. Alkaline plutons: GDP, Glen Dessarry Pluton; LBP, Loch Borralan Pluton; LAP, Loch Ailsh Pluton...
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View PDF for article title, Timing of regional deformation and development of the Moine Thrust Zone in the Scottish Caledonides: constraints from the U–Pb geochronology of alkaline <span class="search-highlight">intrusions</span>
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Journal Article

Structural, petrological, and tectonic constraints on the Loch Borralan and Loch Ailsh alkaline intrusions, Moine thrust zone, northwestern Scotland Open Access

Robert Fox, Michael P. Searle
Journal: Geosphere
Published: 14 May 2021
Geosphere (2021) 17 (4): 1126–1150.
DOI: https://doi.org/10.1130/GES02330.1
... sediments. Four major thrusts, the Moine, Ben More, Glencoul, and Sole thrusts, are well exposed in the Assynt window. Two highly alkaline syenite intrusions crop out within the Moine thrust zone in the southern Assynt window. The Loch Ailsh and Loch Borralan intrusions range from ultramafic melanite...
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View PDF for article title, Structural, petrological, and tectonic constraints on the Loch Borralan and Loch Ailsh alkaline <span class="search-highlight">intrusions</span>, Moine thrust zone, northwestern Scotland
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Journal Article

Structure of the Assynt window, Moine Thrust Zone and relationship of thrusts to alkaline igneous complexes, Caledonian orogeny, NW Scotland Open Access

Michael P. Searle
Published: 12 September 2023
Geological Magazine (2023) 160 (8): 1481–1497.
DOI: https://doi.org/10.1017/S0016756823000511
..., Loch Borralan syenites and lamprophyre sills and dykes), and intruding the Moine schists in the hinterland (Loch Loyal syenite in the north; Glen Dessarry syenite in the south). Within the MTZ, two major intrusions sandwiched between the Moine, Ben More and Borralan thrusts are the Loch Ailsh syenite...
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View PDF for article title, Structure of the Assynt window, Moine Thrust Zone and relationship of thrusts to alkaline igneous complexes, Caledonian orogeny, NW Scotland
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Journal Article

The geology and structural evolution of a Caledonian fold and ductile thrust zone, Kyle of Tongue region, Sutherland, northern Scotland Available to Purchase

ROBERT E. HOLDSWORTH
Published: 01 September 1989
Journal of the Geological Society (1989) 146 (5): 809–823.
DOI: https://doi.org/10.1144/gsjgs.146.5.0809
...) have described syn-tectonic Caledonian granites from the Moine of central Sutherland. Post-tectonic intrusions are related to the Ben Loyal syenite complex which intrudes Moine rocks SSE of the Kyle of Tongue (Fig. 2, Read 1931, 1934, Robertson & Parsons 1974). Some syenite sills (up to 3 m thick) lie...
View PDF for article title, The geology and structural evolution of a Caledonian fold and ductile thrust zone, Kyle of Tongue region, Sutherland, northern Scotland
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Journal Article

Trace element minerals from carbonatite-related fluids, The Aird, Scotland Available to Purchase

E.A. Heptinstall, J. Parnell, A. J. Boyce, J.W. Still
Published: 07 July 2023
Scottish Journal of Geology (2023) 59 (1-2): sjg2021-015.
DOI: https://doi.org/10.1144/sjg2021-015
... to the intrusion of alkaline granite intrusions in which REE have been documented, including the c. 429 Ma Loch Borralan Alkaline Complex ( Young et al. 1994 ; Goodenough et al. 2021 ) and the c. 426 Ma Loch Loyal Syenite Complex ( Walters et al. 2013 ). Several localities in The Aird host...
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Journal Article

Mineralogical Association of Canada Free

Journal: Elements
Published: 01 April 2024
Elements (2024) 20 (2): 128–129.
DOI: https://doi.org/10.2138/gselements.20.2.128
... McLay, of Stratford, Ontario. On behalf of the MAC Board, the President extended his thanks and warm wishes to retiring Business Manager Johanne Caron, who has been a loyal and dedicated part of the Association for the past 20 years. For nearly 20 years, MAC s national office was co-housed...
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Book Chapter

Relationships between the Loch Ailsh and Borralan alkaline intrusions and thrusting in the Moine Thrust zone, southern Assynt culmination, NW Scotland Available to Purchase

Author(s)
M. P. Searle, R. D. Law, J. F. Dewey, M. J. Streule
Book: Continental Tectonics and Mountain Building: The Legacy of Peach and Horne
Series: Geological Society, London, Special Publications
Publisher: Geological Society of London
Published: 01 January 2010
DOI: 10.1144/SP335.18
EISBN: 9781862395831
... in the west. Here we present two new balanced and restored sections across the Moine Thrust zone in the region of the Loch Ailsh and Loch Borralan alkali intrusions. Syenites and alkaline pyroxenites intrude up to Durness Group carbonates. Syenites are interpreted as cut by the Moine and Ben More Thrusts...
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Abstract
View PDF for content titled, Relationships between the Loch Ailsh and Borralan alkaline <span class="search-highlight">intrusions</span> and thrusting in the Moine Thrust zone, southern Assynt culmination, NW Scotland
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Abstract The Moine Thrust zone of NW Scotland marks the Caledonian orogenic front and in the Assynt region consists of several west-vergent major thrust sheets (Moine, Ben More, Glencoul and Sole Thrust sheets) that place allochthonous rocks onto the Lewisian basement and Torridon Group cover in the west. Here we present two new balanced and restored sections across the Moine Thrust zone in the region of the Loch Ailsh and Loch Borralan alkali intrusions. Syenites and alkaline pyroxenites intrude up to Durness Group carbonates. Syenites are interpreted as cut by the Moine and Ben More Thrusts and therefore their intrusion age ( c . 430 Ma) provides a maximum age constraint on cessation of motion along the Moine Thrust. We review and discuss several controversies, notably: (1) relationships between folding in the Ben More Thrust sheet (Sgonnan Mor folds) and fabric development associated with intrusion of the Loch Ailsh pluton and initiation of the Moine and Ben More Thrusts; (2) structural relationships around the Borralan intrusion, particularly the nature of its basal and lateral margins (intrusive or thrust-ramp); (3) the structural relationships of the Cam Loch and Benn Fhuarain klippen; and (4) the timing of motion of all thrust sheets in the southern Assynt culmination.

Journal Article

Dating deformation and cooling in the Caledonian thrust nappes of north Sutherland, Scotland: insights from 40 Ar/ 39 Ar and Rb–Sr chronology Available to Purchase

R. D. DALLMEYER, R. A. STRACHAN, G. ROGERS, G. R. WATT, C. R. L. FRIEND
Published: 01 May 2001
Journal of the Geological Society (2001) 158 (3): 501–512.
DOI: https://doi.org/10.1144/jgs.158.3.501
... regional ductile deformation and metamorphism, possibly during late Caledonian brittle extension of the nappe sequence ( Holdsworth et al. 1999). Halliday et al . (1987) obtained a U–Pb zircon age of 426±9 Ma from a component of the Loch Loyal syenites which they interpreted to date intrusion...
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View PDF for article title, Dating deformation and cooling in the Caledonian thrust nappes of north Sutherland, Scotland: insights from 40 Ar/ 39 Ar and Rb–Sr chronology
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Journal Article

Age of the Loch Borrolan complex, Assynt, and late movements along the Moine Thrust Zone Available to Purchase

O. van Breemen, M. Aftalion, M. R. W. Johnson
Published: 01 August 1979
Journal of the Geological Society (1979) 136 (4): 489–495.
DOI: https://doi.org/10.1144/gsjgs.136.4.0489
... movements on the Ben More Thrust (Parsons, in press), as were the earliest rocks of the Ben More complex (Woolley, op. cit Because the latter intrusion overlapped the major movements on the Ben More Thrust, it has been singled out for detailed U-Pb zircon study. It must be emphasized, however, that the bulk...
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Journal Article

Geochronology and geodynamics of Scottish granitoids from the late Neoproterozoic break-up of Rodinia to Palaeozoic collision Available to Purchase

GRAHAME J.H. OLIVER, SIMON A. WILDE, YUSHENG WAN
Published: 01 May 2008
Journal of the Geological Society (2008) 165 (3): 661–674.
DOI: https://doi.org/10.1144/0016-76492007-105
...–Pb zircon 430 4 Van Breemen et al . 1979 Strathnaver granite Sn U–Pb zircon 429 11 Kinny et al . 2003 a Clunes granite Cl U–Pb zircon 428 2 Stewart et al . 2001 Ben Loyal granite BL U–Pb zircon 426 9 Halliday et al . 1987 Strath Halliday granite Sh U–Pb...
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View PDF for article title, Geochronology and geodynamics of Scottish granitoids from the late Neoproterozoic break-up of Rodinia to Palaeozoic collision
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Journal Article

Fenites, breccia dykes, albitites, and carbonatitic veins near the Great Glen Fault, Inverness, Scotland Available to Purchase

M. S. Garson, J. S. Coats, N. M. S. Rock, T. Deans
Published: 01 July 1984
Journal of the Geological Society (1984) 141 (4): 711–732.
DOI: https://doi.org/10.1144/gsjgs.141.4.0711
... schists and gneisses (McLachlan 1951; Tanner & Tobisch 1972; Peacock 1973). These are much more widespread than currently documented (BGS mapping), and a regional study is under way. Fenitized Cambrian and Moine metasediments around the Loch Borralan, Loch Ailsh, and Ben Loyal syenitic intrusions (King...
View PDF for article title, Fenites, breccia dykes, albitites, and carbonatitic veins near the Great Glen Fault, Inverness, Scotland
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Journal Article

Thermal evolution of the Scandian hinterland, Naver nappe, northern Scotland Free

Calvin A. Mako, Richard D. Law, Mark J. Caddick, J. Ryan Thigpen, Kyle T. Ashley, John Cottle, Andrew Kylander-Clark
Published: 28 May 2019
Journal of the Geological Society (2019) 176 (4): 669–688.
DOI: https://doi.org/10.1144/jgs2018-224
... estimates of Goodenough et al. (2011) for alkaline intrusions (G) in the Assynt region of the Moine thrust zone are older than most other Scandian ages, including both the Ben Loyal alkaline intrusive complex (W) in the Ben Hope thrust sheet and the ages reported in this study from Moine metasedimentary...
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