none 10.1144/gsjgs.144.4.0611 Geological Society of London Geological Society of London 1881 30749573 44798 2024111903231600939 10.1144 2024-11-19T07:58:35Z 2007-12-20T17:39:02Z 59 Journal of the Geological Society JGS 0016-7649 2041-479X 05 16 2007 07 1987 144 4 A. N. HALLIDAY Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 OQU, UK Department of Geological Sciences, University of Michigan, Ann Arbor, MZ 48109–1063, USA M. AFTALION Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 OQU, UK I. PARSONS Department of Geology and Mineralogy, Marischal College, University of Aberdeen, Aberdeen AB9 1AS, UK A. P. DICKIN Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 OQU, UK M. R. W. JOHNSON Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh EH9, UK The alkaline complexes of NW Scotland lie in a zone sub-parallel to the Moine thrust and represent the NW edge of the otherwise overwhelmingly calc-alkaline late-orogenic magmatism of the Caledonian fold-belt. The emplacement of intrusives in Assynt overlapped the thrust movements and new U-Pb zircon ages for the Loch Ailsh intrusion (439 ± 4 Ma) provide are liable bracket, when combined with existing age data for the Loch Borralan intrusion (430 ± 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, give an age of 426 ± 9 Ma, in contrast to the deformed Glen Dessary syenite for which earlier work gave 456 ± 5 Ma. The linear distribution of the alkaline complexes to the west of the calc-alkaline plutons, and the ultra-potassic character of the Loch Borralan complex (the most westerly), are consistent with, but do not prove, generation related to a W-dipping subduction zone. The persistence of the magmatism, over 30 Ma, in a belt being shortened by thrusting, suggests a source in the mantle lithosphere. The absence of magmatism further to the NW and the production of calc-alkaline magmas to the SE of this zone, is compatible with a model in which the thermal state of the lithosphere exercises the most important control on the nature of Late Caledonian magmatism. 06 06 2022 07 1987 611 617 10.1144/gsjgs.144.4.0611 1 10.1144/crossmark-policy www.lyellcollection.org true 1986-05-15 1986-08-11 2022-06-06 https://doi.org/10.15223/policy-002 10.1144/gsjgs.144.4.0611 https://www.lyellcollection.org/doi/10.1144/gsjgs.144.4.0611 https://www.lyellcollection.org/doi/pdf/10.1144/gsjgs.144.4.0611 https://geoscienceworld.org/jgs/article-lookup?doi=10.1144/gsjgs.144.4.0611 Philosophical Transactions of the Royal Society Bailey D. K. 309 297 1980 Volcanism, Earth degassing and replenished lithosphere mantle Bailey D. K.Volcanism, Earth degassing and replenished lithosphere mantlePhilosophical Transactions of the Royal Society1980A29730922 10.1017/S0016756800032015 10.1007/BF00376636 10.1007/BF00376635 10.1017/S0263593300013523 10.1016/0012-821X(85)90148-7 10.1144/gsjgs.141.4.0711 The Caledonides of the British Isles—Reviewed Halliday A. N. 653 1979 Halliday A. N., Aftalion M., Van Breemen O., Jocelyn J., Harris A. L., Holland C. H., Leake B. E.Petrogenetic Significance of Rb-Sr and U-Pb isotopic systems in the 400 Ma old British Isles granitoids and their hostsThe Caledonides of the British Isles—Reviewed19798LondonSpecial Publication of the Geological Society65362 10.1017/S0263593300013730 Halliday A. N. Dickin A. P. Fallick A. E. Stephens W. E. Hutton D. H. W. Yardley B. W. & Harmon R. S. 1984 b . Open Mantle and crust systems during ascent and emplacement of late Caledonian alkali rich magmas: a detailed multidisciplinary study of the Ratagain complex NW Scotland. In: Proceedings of Conference on Open Magmatic Systems I.S.F.M. Southern Methodist University 175–6 10.1144/sjg21040465 Halliday A. N. Stephens W. E. Hunter R. H. Menzies M. A. Dickin A. P. & Hamilton P. J. 1985. Isotopic constraints on the building of the deep Scottish lithosphere. 150th Anniversary of the Geological Society of Edinburgh Scottish Journal of Geology Special Issue. Transactions of the American Geophysical Union Hertogen J. 1114 66 1985 A mantle-sediment mixing model for the petrogenesis of an ultrapotassic lamproite from SE Spain. EOS Hertogen J., Lopez-Ruiz J., Rodriguez-Badiola E., Demaiffe D., Weis D.A mantle-sediment mixing model for the petrogenesis of an ultrapotassic lamproite from SE Spain. EOSTransactions of the American Geophysical Union1985661114 Terra Cognita Holden P. 213 5 1985 Nd isotopic evidence for mantle and crust derived components as enclaves and magmas in the Scottish late Caledonian granitoids Holden P., Halliday A. N., Stephens W. E.Nd isotopic evidence for mantle and crust derived components as enclaves and magmas in the Scottish late Caledonian granitoidsTerra Cognita198552134 Geological Excursion Guide to the Assynt District of Sutherland Johnson M. R. W. 1979 Johnson M. R. W., Parsons I.Geological Excursion Guide to the Assynt District of Sutherland1979EdinburghEdinburgh Geological Society 10.1144/gsjgs.142.5.0863 27th International Geological congress Abstracts Menzies M. A. 348 5 1984 Enriched mantle below the Scottish Highlands: Sr and Nd isotope and rare earth elements in peridotite and pyroxenite xenoliths from Loch Roag, Streap Comlaidh and Kilchatten, Scotland Menzies M. A., Halliday A. N.Enriched mantle below the Scottish Highlands: Sr and Nd isotope and rare earth elements in peridotite and pyroxenite xenoliths from Loch Roag, Streap Comlaidh and Kilchatten, Scotland27th International Geological congress Abstracts19845348 10.1144/sjg14020141 10.1016/0012-821X(69)90164-2 10.1016/0016-7037(86)90172-9 10.1093/petrology/6.3.365 10.1017/S0016756800053863 10.1002/gj.3350080107 The Caledonides of the British Isles—Reviewed Parsons I. 677 1979 Parsons I., Harris A. L., Holland C. H., Leake B. E.The Assynt alkaline suiteThe Caledonides of the British Isles—Reviewed19798LondonSpecial Publication of the Geological Society67781 10.1144/sjg19010059 Read H. H. Phemister J. & Ross G. 1926. The geology of Strath Oykell and Lower Loch Shin. Memoir of the Geological Survey of Scotland (Explanation of Sheet 102). 10.1144/sjg12030237 10.1144/gsjgs.141.6.1033 10.1144/sjg10020129 10.1007/BF00378265 10.1144/GSL.JGS.1953.109.01-04.08 10.1144/gsjgs.138.2.0123 10.1111/j.1365-246X.1983.tb01921.x 10.1144/sjg15010049 10.1144/gsjgs.136.4.0489 10.1130/0091-7613(1985)13<405:ASMASF>2.0.CO;2 10.1002/gj.3350070110 Bulletin of the British Museum (Natural History) Woolley A. R. 287 2 1973 The pseudoleucite borolanites and associated rocks of the South-eastern tract of the Borralan complex, Scotland Woolley A. R.The pseudoleucite borolanites and associated rocks of the South-eastern tract of the Borralan complex, ScotlandBulletin of the British Museum (Natural History)19732287333