DOCSLIB.ORG

Revision of the Solid Geology Shown on The'assynt District'special

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Revision of the Solid Geology Shown on The'assynt District'special Revision of the solid geology shown on the ‘Assynt District’ special geological map. A report on the 2002 fieldwork Integrated Geoscience Surveys (North) Internal Report IR/03/058 BRITISH GEOLOGICAL SURVEY INTERNAL REPORT IR/03/058 Revision of the solid geology shown on the ‘Assynt District’ special geological map. A report on the 2002 fieldwork M Krabbendam, K M Goodenough, R M Key, A G Leslie, S C Loughlin The National Grid and other Ordnance Survey data are used with the permission of the Controller of Her Majesty’s Stationery Office. Ordnance Survey licence number GD 272191/2003 Key words Moine Thrust, thrust, gneiss, Lewisian Gneiss. Bibliographical reference KRABBENDAM, M, GOODENOUGH, K M, KEY, R M, LESLIE, A G AND LOUGHLIN, S. C . 2003. Revision of the solid geology on the ‘Assynt District’ special geological map. A report on the 2002 fieldwork. British Geological Survey Internal Report,IR/03/058. 37pp. © NERC 2003 Keyworth, Nottingham British Geological Survey 2003 IR/03/058:Version 0.2 Last modified: 31/03/2003 13:00 BRITISH GEOLOGICAL SURVEY The full range of Survey publications is available from the BGS Keyworth, Nottingham NG12 5GG Sales Desks at Nottingham and Edinburgh; see contact details 0115-936 3241 Fax 0115-936 3488 below or shop online at www.thebgs.co.uk e-mail: [email protected] The London Information Office maintains a reference collection www.bgs.ac.uk of BGS publications including maps for consultation. Shop online at: www.thebgs.co.uk The Survey publishes an annual catalogue of its maps and other publications; this catalogue is available from any of the BGS Sales Murchison House, West Mains Road, Edinburgh EH9 3LA Desks. 0131-667 1000 Fax 0131-668 2683 The British Geological Survey carries out the geological survey of e-mail: [email protected] Great Britain and Northern Ireland (the latter as an agency service for the government of Northern Ireland), and of the London Information Office at the Natural History Museum surrounding continental shelf, as well as its basic research (Earth Galleries), Exhibition Road, South Kensington, London projects. It also undertakes programmes of British technical aid in SW7 2DE geology in developing countries as arranged by the Department for International Development and other agencies. 020-7589 4090 Fax 020-7584 8270 020-7942 5344/45 email: [email protected] The British Geological Survey is a component body of the Natural Environment Research Council. Forde House, Park Five Business Centre, Harrier Way, Sowton, Exeter, Devon EX2 7HU 01392-445271 Fax 01392-445371 Geological Survey of Northern Ireland, 20 College Gardens, Belfast BT9 6BS 028-9066 6595 Fax 028-9066 2835 Maclean Building, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB 01491-838800 Fax 01491-692345 Parent Body Natural Environment Research Council, Polaris House, North Star Avenue, Swindon, Wiltshire SN2 1EU 01793-411500 Fax 01793-411501 www.nerc.ac.uk 3131iiii ii IR/03/058:Version 0.2 Last modified: 31/03/2003 13:00 Foreword This report succinctly describes the main conclusions regarding the solid geology of the Assynt District based on fieldwork carried out for the Moine Thrust Project in the summer of 2002. The aim of the fieldwork was to revise, rather than resurvey, the solid geology of the Assynt Special Sheet (which includes parts of Sheets 107E, 108W, 101E, 102W). Reports concerning the survey of the drift, and the minor intrusions within the Assynt half-window, will be issued separately. Contents Foreword ...................................................................................................................................... iii Contents........................................................................................................................................ iii Summary .......................................................................................................................................vi 1 Introduction: aims and strategy of fieldwork ......................................................................1 1.1 Previous Work ................................................................................................................1 1.2 Lithology and Stratigraphy .............................................................................................1 1.3 Area covered during Summer 2002 Survey....................................................................2 2 Mapping in the Assynt half-window.....................................................................................4 2.1 Course of Ben More Thrust ............................................................................................4 2.2 Internal structure of the Ben more thrust sheet...............................................................6 2.2.1 Coire a’ Mhadhaidh Detachment.................................................................................6 2.2.2 Imbricates in the Loch an Eircill–Loch nan Caorach area [NC 29 27–NC 30 26]......7 2.2.3 Cnoc Chaornaidh [NC 30 08]......................................................................................7 2.2.4 Glencoul [NC 29 28] ...................................................................................................7 2.3 The southern termination of the Glencoul Thrust [NC 26 22-NC 28 21].......................8 2.4 Various areas within THE Glencoul and Sole Thrust sheets..........................................9 2.4.1 Glas Bheinn area..........................................................................................................9 2.4.2 Cnoc an Droighinn [~NC 265 235] .............................................................................9 2.4.3 Beinn an Fhurain (north) [~NC 28 21]........................................................................9 2.4.4 Cnoc nan Uamh Thrust [~NC 27 20] ........................................................................10 2.4.5 Beinn an Fhuarain (south); south of Allt nam Uamh [~NC 26 15]...........................10 3 Minor Intrusions...................................................................................................................10 4 Moine .....................................................................................................................................11 4.1 Coire Cean Loch–Corriekinloch–Loch Merkland ........................................................11 5 Lewisian Gneiss Complex ....................................................................................................12 3131iiiiii iii IR/03/058: Version 0.3 Last modified: 15/07/2003 11.00 5.1 Introduction...................................................................................................................12 5.2 Lithologies noted during the 2002 mapping .................................................................12 5.3 Deformation and metamorphism ..................................................................................16 5.3.1 Introduction ...............................................................................................................16 5.3.2 Our observations........................................................................................................16 5.3.3 Canisp Shear Zone and Lochinver Monocline ..........................................................17 5.3.4 Brittle deformation ....................................................................................................17 5.4 Overview of the evolution of the Lewisian Gneiss complex in Assynt........................17 5.5 Lewisian inliers in the ben more and glencoul Thrust Sheets ......................................19 5.5.1 Present work ..............................................................................................................19 6 Torridonian...........................................................................................................................20 7 References .............................................................................................................................20 Figures 1.1: Overview topographical map of the Assynt area. 1.2: Areas resurveyed during the 2002 field season. 1.3: Overview of geology of the Assynt District special geological map. 2.1: Geological map showing different interpretations of the trace of the Ben More Thrust. 2.2: Field slips of the area west and north of Ben Uidhe, showing newly mapped course of the Ben More Thrust. 2.3: View along ‘Glen Beag’ (unnamed glen to the south of the Stack of Glencoul) to Beinn Uidhe showing folded quartzite in background and truncation of quartzite syncline against fault in foreground. 2.4: View of east face of Na Tuadhan, with position of Coire a’ Mhadaidh Detachment. 2.5: Sketch cross-sections showing internal structure of the Ben More Thrust Sheet and the relationship of the Ben More Thrust and the Coire a’ Mhadaidh Detachment. 2.6: Contact between Lewisian gneisses and Basal Quartzite within the Ben More Thrust Sheet. 2.7: Schematic north–south, down-plunge section from the Stack of Glencoul to Beinn Uidhe, taken approximately perpendicular to the transport direction. 2.8: View southwards into Coire Dearg on northern side of Glas Bheinn. 5.1: Lewisian migmatites exposed in a road cut on the north side of Loch Assynt (P517131). 5.2: Lewisian migmatites (agmatites) exposed on rock pavements on the north side of Loch Assynt (P517134). 5.3: Lewisian migmatites exposed on rock pavements on the north side of Loch Assynt (P517135). 5.4: Granitic vein network in Lewisian hornblende-gneiss west of Quinag
Load more

Recommended publications
  • Property Document
    Offers Over Glencorse Self-Catering and Bed & Breakfast £350,000 (Freehold) Drumbeg, Sutherland, IV27 4NW Outstanding detached Situated on the Exceptional hillwalking directly Trading as a well- Attractive garden grounds Having been tastefully house, located in a North Coast 500 from the property and established and highly and off-road parking plus an refurbished, Glencorse stunning elevated position tourist route, kayaking or sailing immediately rated self-catering unit upper walled garden, would equally make a with superlative mountain within the small to hand (3 minutes’ walk to with 4 bedrooms and currently a BBQ terrace area, uniquely beautiful family and loch views plus coastal Coastal village of Drumbeg beach or to Loch generous amenity offering some development home; subject to views behind the property Drumbeg Drumbeg jetty) space potential (STPP) consents DESCRIPTION Glencorse is a charming and beautifully presented 4-bedroom detached self-catering unit and bed and breakfast business. The subjects are located in an elevated setting with truly stunning views over Loch Drumbeg. This substantial property is situated centrally to the hamlet of Drumbeg with services immediately to hand. An imposing and attractive stone-built house dating from around 1820. This attractively decorated property reflects a high level of modern comfort. The house boasts a characterful ambience and offers excellent facilities throughout balancing the retained historic features with modern comfort. The owner has made considerable investment this year in replacing the entire linen used within the business. Glencorse is a traditionally built, former school house with unusually high ceilings and appealing period features. It has a well maintained garden popular with a resident deer (known locally as Albert) who is a great attraction with guests.
    [Show full text]
  • KINLOCHBERVIE COMMUNITY COUNCIL Minutes of Meeting 29Th October 2019 at the Harbour Offices
    KINLOCHBERVIE COMMUNITY COUNCIL Minutes of Meeting 29th October 2019 at The Harbour Offices PRESENT: Graham Wild (Chair), Kirsty Holland, Christine MacKenzie, Margaret Meek, Murdo Macpherson, Sandra Armes-Harris, Mairi Eastcroft, Maaike Silcock (Minutes), 1. APOLOGIES: Andrea Boyes 2. MINUTES of the 24th September 2019 Two amendments were made to the minutes of the meeting held on the 24th September 2019. Item 3.5, Alexander Munro’s application for a café is still being considered. Planning has NOT been approved. Item 3.12, one of the gritter lorry drivers is NOT retiring, he has taken up the position as Assistant Harbour Master. The minutes were proposed by Graham and seconded by Christine. The minutes were approved. 3. MATTERS ARISING FROM THE MINUTES OF THE 24th September 2019 3.1 Having discussed the potential problems with having the electric hook-up at the Village Hall, Sandra was happy for it to be located by the public toilets at the Harbour. 3.2 The Pavements, overgrown with Gorse and Brambles need to be cut back. Graham will speak to Hugh to see when this might be done. 3.3 Graham will contact Hugh to find out who the new Area Manager at Highland Council is to replace Joanne Sutherland. Murdo will then re-send a letter to them, asking for a barrier to be placed along the edge of Big Brae to prevent further accidents. 1 3.4 Graham and Murdo will bolt the picnic benches at Loch Clash to the concrete slab. This will hopefully prevent campervans from monopolising the picnic area, preventing others from using it for what it was intended; having a picnic.
    [Show full text]
  • James Hawkins 2009 the Chronicles of the Straight Line Ramblers Club
    The Chronicles of the Straight Line Ramblers Club James Hawkins 2009 The Chronicles of the Straight Line Ramblers Club James Hawkins SW1 GALLERY 12 CARDINAL WALK LONDON SW1E 5JE James and Flick Hawkins would like to thank The John Muir Trust (www.jmt.org) and Knoydart Foundation (www.knoydart-foundation.com) for their support Design Peter A Welch (www.theworkhaus.com) MAY 2009 Printed J Thomson Colour Printers, Inverness, IV3 8GY The Straight Line Ramblers Club Don’t get me wrong, I am most enthusiastic about technology and its development; I am very happy to be writing this on my new PC that also helps me enormously with many aspects of my visual work. No it is more that, in our long evolution, at this point there now seems a danger of disconnection from The Straight Line Ramblers Club was first conceived when we were teenagers walking our parents the natural world. We have always been controlled by Nature, now we think that we can control it. dogs around the Oxfordshire countryside, membership was flexible, anyone could join and of course the one thing we didn’t do was walk in a straight line. Many of us have kept in touch and when John Muir, whose writings I have discovered during the research for this exhibition, felt that he needed we meet up that spirit of adventure still prevails, there aren’t any rules, but if there were they would to experience the wilderness “to find the Law that governs the relations subsisting between human be that spontaneity is all, planned routes exist to be changed on a whim and that its very impor- beings and Nature.” After many long and often dangerous journeys into wild places he began to tant to see what’s around the next corner or over the next top.
    [Show full text]
  • A Large Explosive Silicic Eruption in the British Palaeogene Igneous Province.', ScientiC Reports., 9 (1)
    Durham Research Online Deposited in DRO: 08 February 2019 Version of attached le: Published Version Peer-review status of attached le: Peer-reviewed Citation for published item: Troll, Valentin R. and Emeleus, C. Henry and Nicoll, Graeme R. and Mattsson, Tobias and Ellam, Robert M. and Donaldson, Colin H. and Harris, Chris (2019) 'A large explosive silicic eruption in the British Palaeogene Igneous Province.', Scientic reports., 9 (1). p. 494. Further information on publisher's website: https://doi.org/10.1038/s41598-018-35855-w Publisher's copyright statement: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Additional information: Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.
    [Show full text]
  • Scotland's Geodiversity, Provides a Source of Basic Raw Materials: Raw Basic of Source a Provides Geodiversity, Scotland's
    ROCKS,FOSSILS, LANDFORMS AND SOILS AND LANDFORMS ROCKS,FOSSILS, Cover photograph:Glaciatedmountains,CoireArdair,CreagMeagaidh. understanding. e it and promote its wider its promote and it e conserv to taken being steps the and it upon pressures the heritage, Earth Scotland's of diversity the illustrates leaflet This form the foundation upon which plants, animals and people live and interact. interact. and live people and animals plants, which upon foundation the form he Earth. They also They Earth. he t of understanding our in part important an played have soils and landforms fossils, rocks, Scotland's surface. land the alter the landscapes and scenery we value today, how different life-forms have evolved and how rivers, floods and sea-level changes a changes sea-level and floods rivers, how and evolved have life-forms different how today, value we scenery and landscapes the re continuing to continuing re CC5k0309 mates have shaped have mates cli changing and glaciers powerful volcanoes, ancient continents, colliding how of story wonderful a illustrates It importance. Printed on environmentally friendly paper friendly environmentally on Printed nternational i and national of asset heritage Earth an forms and istence, ex Earth's the of years billion 3 some spanning history, geological For a small country, Scotland has a remarkable diversity of rocks, fossils, landforms and soils. This 'geodiversity' is the res the is 'geodiversity' This soils. and landforms fossils, rocks, of diversity remarkable a has Scotland country, small a For ult of a rich and varied and rich a of ult Leachkin Road, Inverness, IV3 8NW. Tel: 01463 725000 01463 Tel: 8NW.
    [Show full text]
  • 809 Bus Time Schedule & Line Route
    809 bus time schedule & line map 809 Ullapool - Badnaban + Achmelvich + Drumbeg View In Website Mode The 809 bus line (Ullapool - Badnaban + Achmelvich + Drumbeg) has 4 routes. For regular weekdays, their operation hours are: (1) Achmelvich: 10:00 AM (2) Badnaban: 3:40 PM (3) Drumbeg: 3:25 PM - 5:20 PM (4) Ullapool: 6:45 AM - 12:20 PM Use the Moovit App to ƒnd the closest 809 bus station near you and ƒnd out when is the next 809 bus arriving. Direction: Achmelvich 809 bus Time Schedule 36 stops Achmelvich Route Timetable: VIEW LINE SCHEDULE Sunday Not Operational Monday 10:00 AM Ferry Terminal, Ullapool West Shore Street, Ullapool Tuesday 10:00 AM Latheron Lane Car Park, Ullapool Wednesday 10:00 AM Vyner Place, Ullapool Thursday 10:00 AM Friday 10:00 AM Rhue Road End, Ardmair Saturday 10:00 AM Camp Site, Ardmair Blughasary Road End, Strathcanaird Keanachulish Road End, Ardmair 809 bus Info Direction: Achmelvich Road End, Strathcanaird Stops: 36 Trip Duration: 76 min Junction, Drumrunie Line Summary: Ferry Terminal, Ullapool, Latheron Lane Car Park, Ullapool, Vyner Place, Ullapool, Rhue Road End, Ardmair, Camp Site, Ardmair, Blughasary Knockan Crag, Elphin Road End, Strathcanaird, Keanachulish Road End, Ardmair, Road End, Strathcanaird, Junction, Knockan Road End, Elphin Drumrunie, Knockan Crag, Elphin, Knockan Road End, Elphin, Telephone Kiosk, Elphin, Post Box, Elphin, Telephone Kiosk, Elphin Rhisalach Road End, Elphin, Elphin Junction, Grampian Avenue, Scotland Ledmore, Hotel, Inchnadamph, Ardvreck Castle, Loch Assynt, Skiag Bridge,
    [Show full text]
  • Eaglet 106 2011
    Movements of 106 in 2011 09 January 2011: Remains at home The female eaglet continues to live around the Ben Griams within the parents' home range. 21 January 2011 She was a little to the west of the main range today, being 3km north of Loch Rimsdale. 25 January 2011: No change Between Loch Rimsdale and Loch Strathy on 25th January. 02 February 2011: Off on her travels The young female eagle 106 has left her home range in the Flow Country after a stay of just over six months with its parents (her sibling 107 left 3 months earlier). She flew west and at 3pm on 27th she was near Ben Auskaird, 6 km southeast of Scourie in West Sutherland, she stayed there until 10am on 28th. By 4pm, she was by a loch southeast of Ben More Assynt, where she stopped until moving to upper Strathoykell, north of Duchally, at 10am on 30th. By 4pm that day she had gone further to the east and was southeast of Glencalvie Lodge. Again she lingered and her next move was south to Ben Wyvis, where she arrived 4pm on 1st February. She roosted that night a little further north in a craggy valley to the west of Wyvis Lodge. Next day she flew west and at 4pm on 2nd was just to the northeast of Aultguish Inn on the Ullapool road. Is she going to turn into a traveller like her brother 107? January 25th to February 2nd 07 February 2011: To Wester Ross On 3rd February, 106 flew west to Rhiddoroch Estate, northeast of Ullapool, by 4pm and was in the same area north of Rhiddoroch Lodge by latest location 4am on 6th.
    [Show full text]
  • TA 7.5 Figure 1 Key Achany Extension Wind Farm EIA
    WLA 38: Ben Hope - Ben Loyal Northern Arm Key Site Boundary 40km Wider Study Area 20km Detailed Study Area 5 km Buffer WLA 37: Foinaven - Ben Hee !( Proposed Turbine !( Operational Turbine !( Consented Turbine Wild Land Area (WLA) 34: Reay - Cassley !( !( !( !( !( Other WLA !( !( !( !( !( !( !( WLA 33: Quinag !( !( Creag Riabhach WLA Sub-Section Divider !( !( !( !( !( !( !( !Z !( Assessment Location Access Route to Assessment WLA 35: Ben Klibreck Location Central Core - Armine Forest Map of Relative Wildness High 5 !Z Low 6 !Z 4 3 Map of relative wildness GIS information obtained !Z !Z from NatureScot Natural Spaces website: http://gateway.snh.gov.uk/natural-spaces/index.jsp WLA 32: Inverpolly - Glencanisp 7 !Z Eastern Lobster Claw !( !( !( 2 1 !( !( !Z !( !Z !( !( !( !( !( !( !( !( !( !( !( Western !( Lobster Claw !( !( Lairg Scale 1:175,000 @ A3 !( !( Km !( !( Achany !(!( !( 0 2 4 6 !( !( !( !( !( ± !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( Braemore Lairg 2 !( TA 7.5 Figure 1 !( !( !( !( !( !( !( !( !( Map of Relative Wildness (WLA 34) !( !( WLA 29: Rhiddoroch - !( !( !( !( !( !( !( !( Beinn Dearg - Ben Wyvis !( !( Rosehall !( !( !( !( !( !( Achany Extension Wind Farm EIA Report Drawing No.: 120008-TA7.5.1-1.0.0 Date: 07/07/2021 © Crown copyright and database rights 2021 Ordnance Survey 0100031673 WLA 38: Ben Hope Northern Arm - Ben Loyal Site Boundary 40km Wider Study WLA 37: Foinaven 20km Detailed Study - Ben Hee 5 km Buffer !( Proposed Turbine Wild Land Area (WLA) 34: Reay - Cassley Other
    [Show full text]
  • The Minor Intrusions of Assynt, NW Scotland: Early Development of Magmatism Along the Caledonian Front
    Mineralogical Magazine, August 2004, Vol. 68(4), pp. 541–559 The minor intrusions of Assynt, NW Scotland: early development of magmatism along the Caledonian Front 1, 2,3 4 K. M. GOODENOUGH *, B. N. YOUNG AND I. PARSONS 1 British Geological Survey, West Mains Road, Edinburgh EH9 3LA, UK 2 Department of Geology and Mineralogy, University of Aberdeen, Marischal College, Broad Street, Aberdeen AB24 3UE, UK 3 Baker Hughes Inteq, Barclayhill Place, Portlethen, Aberdeen AB12 4PF, UK 4 Grant Institute of Earth Science, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK ABSTRACT The Assynt Culmination of the Moine Thrust Belt, in the northwest Scottish Highlands, contains a variety of Caledonian alkaline and calc-alkaline intrusions that are mostly of Silurian age. These include a significant but little-studied suite of dykes and sills, the Northwest Highlands Minor Intrusion Suite. We describe the structural relationships of these minor intrusions and suggest a classification into seven swarms. The majority of the minor intrusions can be shown to pre-date movement in the Moine Thrust Belt, but some appear to have been intruded duringthe period of thrusting.A complex history of magmatism is thus recorded within this part of the Moine Thrust Belt. New geochemical data provide evidence of a subduction-related component in the mantle source of the minor intrusions. KEYWORDS: Assynt, Caledonian, minor intrusion, Moine Thrust, Scotland. Introduction north of Assynt, to the Achall valley near Ullapool, but they are most abundant in the Assynt area. The WITHIN the Assynt Culmination of the Moine minor intrusions constitute a significant part of the Thrust Belt of NW Scotland (Fig.
    [Show full text]
  • NORTHWEST © Lonelyplanetpublications Northwest Northwest 256 and Thedistinctive, Seeminglyinaccessiblepeakstacpollaidh
    © Lonely Planet Publications 256 www.lonelyplanet.com NORTHWEST •• Information 257 0 10 km Northwest 0 6 miles Northwest – Maps Cape Wrath 1 Sandwood Bay & Cape Wrath p260 Northwest Faraid 2 Ben Loyal p263 Head 3 Eas a' Chùal Aluinn p266 H 4 Quinag p263 Durness C Sandwood Creag Bay S Riabach Keoldale t (485m) To Thurso The north of Scotland, beyond a line joining Ullapool in the west and Dornoch Firth in r Kyle of N a (20mi) t Durness h S the east, is the most sparsely populated part of the country. Sutherland is graced with a h i n Bettyhill I a r y 1 Blairmore A838 Hope of Tongue generous share of the wildest and most remote coast, mountains and glens. At first sight, Loch Eriboll M Kinlochbervie Tongue the bare ‘hills’, more rock than earth, and the maze of lochs and waterways may seem Loch Kyle B801 Cranstackie Hope alien – part of another planet – and unattractive. But the very wildness of the rockscapes, (801m) r Rudha Rhiconich e Ruadh An Caisteal v the isolation of the long, deep glens, and the magnificence of the indented coastline can E (765m) a A838 Foinaven n Laxford (911m) Ben Hope h Loch t exercise a seductive fascination. The outstanding significance of the area’s geology has Bridge (927m) H 2 Loyal a r been recognised by the designation of the North West Highlands Geopark (see the boxed t T Scourie S Loch Ben Stack Stack A836 text on p264 ), the first such reserve in Britain. Intrusive developments are few, and many (721m) long-established paths lead into the mountains and through the glens.
    [Show full text]
  • TORRIDON Gikoup /~ L Purnpellgik~, E.Pidol'e R. I
    Downloaded from http://mem.lyellcollection.org/ by guest on September 24, 2021 Chapter 5 Overview General aspects of the Torridonian briefly reviewed in the following instability and fault activity is evident from the time the earliest paragraphs include the significance of the similarity in depositional Stoer and Torridon Group sediments were deposited (pp. 20 & 44), style shown by the three component groups, their burial history, even though the soft-sediment contortions which formed during palaeocontinental setting and regional correlation. sedimentation and thought to be seismically induced, are noticeably absent from the lowest units (Clachtoll and Diabaig Formations). Contortions are also absent from the basal Sleat Group (Rubha Depositional style Guail and Loch na Dal Formations). The reason for the lack of contorted bedding in the lowermost formations and their abundance The Stoer, Sleat and Torridon Groups are thick fluvial succes- at other stratigraphic levels remains a mystery. sions, each of which tends to become finer upwards. The last two The tectonic instability recorded in the sediments, taken together groups both show an upward progression from locally derived basal with the palaeocurrent directions and evidence for decelerating breccias into lake deposits, followed by a thick fluvial sequence, subsidence, suggests rifting. The rift-bounding faults are surmised to as if they were deposited in a regime of decelerating subsidence. have dipped mainly eastwards, so that some of them were trans- In addition, both were derived from progressively more acid source formed into thrusts by Caledonian compression (Brewer & Smythe rocks, as the source terrain expanded to embrace not just local basic 1984; Blundell et al.
    [Show full text]
  • And Geodynamic Significance of Archaean Ultramafic-Mafic Bodies in the Mainland Lewisian Gneiss Complex, North Atlantic Craton
    Guice, G. L., McDonald, I., Hughes, H. S.R., MacDonald, J. M. and Faithfull, J. W. (2020) The origin(s) and geodynamic significance of Archaean ultramafic-mafic bodies in the mainland Lewisian Gneiss Complex, North Atlantic Craton. Journal of the Geological Society, 177(4), pp. 700-717. (doi: 10.1144/jgs2020-013). This is the author’s final accepted version. There may be differences between this version and the published version. You are advised to consult the publisher’s version if you wish to cite from it. http://eprints.gla.ac.uk/211628/ Deposited on: 09 March 2020 Enlighten – Research publications by members of the University of Glasgow http://eprints.gla.ac.uk Downloaded from http://jgs.lyellcollection.org/ at University of Glasgow on March 9, 2020 Accepted Manuscript Journal of the Geological Society The origin(s) and geodynamic significance of Archaean ultramafic-mafic bodies in the mainland Lewisian Gneiss Complex, North Atlantic Craton George L. Guice, Iain McDonald, Hannah S. R. Hughes, John M. MacDonald & John W. Faithfull DOI: https://doi.org/10.1144/jgs2020-013 Received 17 January 2020 Revised 1 March 2020 Accepted 2 March 2020 © 2020 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. Publishing disclaimer: www.geolsoc.org.uk/pub_ethics Supplementary material at https://doi.org/10.6084/m9.figshare.c.4878588 To cite this article, please follow the guidance at https://www.geolsoc.org.uk/~/media/Files/GSL/shared/pdfs/Publications/AuthorInfo_Text.pdf?la=en Manuscript version: Accepted Manuscript This is a PDF of an unedited manuscript that has been accepted for publication.
    [Show full text]