Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-23T03:13:48.432Z Has data issue: false hasContentIssue false
  • English
  • Français

Regional and tectonic implications of parallel Caledonian and Permo-Carboniferous lamprophyre dyke swarms from Lismore, Ardgour

Published online by Cambridge University Press:  03 November 2011

M. A. Morrison ,
G. L. Hendry  and
P. T. Leat
M. A. Morrison
Affiliation:
Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, U.K.
G. L. Hendry
Affiliation:
Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, U.K.
P. T. Leat
Affiliation:
Department of Geology, Imperial College of Science and Technology, Prince Consort Road, London, SW7 2BP, U.K.
Get access Rights & Permissions [Opens in a new window]

Abstract

Geochemical data are presented for 166 minor intrusions collected across the axis of the Ardgour swarm in the Isle of Lismore. The intrusions can be divided into: an alkali basalt-camptonite-monchiquite group resembling other Scottish Permo-Carboniferous dykes; a group of calc-alkaline (shoshonitic) lamprophyres, diorites and porphyrites with affinities to the late Silurian-early Devonian appinite suite of Scotland; and Tertiary dolerites. The different groups cannot be unambiguously distinguished in the field and secondary alteration precludes petrographic division in many cases. The data indicate that Caledonian and Permo-Carboniferous lamprophyres have probably been confused in previous accounts of dyke distributions in the region. In Lismore the two groups have identical azimuths but the Caledonian intrusions appear to have a greater aggregate volume. The implications for tectonic and regional models of the area are discussed.

Keywords

Alkalinecalc-alkalineGreat Glen Faultintrusion mechanismspotassiumScotlandshoshoniteTertiarytrace elements
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 77 , Issue 4 , 1987 , pp. 279 - 288
Copyright
Copyright © Royal Society of Edinburgh 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baxter, A. N. 1987. Petrochemistry of late Palaeozoic alkali lamprophyre dykes from N Scotland. TRANS R SOC EDINBURGH; EARTH SCI 77, 267–77.Google Scholar
Barnes, R. P., Rock, N. M. S. & Gaskarth, J. W. 1986. Late Caledonian dyke-swarms in Southern Scotland: new field, petrological and geochemical data for the Wigtown Peninsula, Galloway. GEOL J 21, 101–26.Google Scholar
Baxter, A. N. & Mitchell, J. G. 1984. Camptonite-Monchiquite dyke swarms of Northern Scotland; Age relationships and their implications. SCOTT J GEOL 20, 297–308.Google Scholar
Bowes, D. R. & Wright, A. E. 1967. The explosion breccia pipes near Kentallen, Scotland, and their geological setting. TRANS R SOC EDINBURGH 67, 110–43.Google Scholar
Delaney, P. T. & Pollard, D. D. 1982. Solidification of basaltic magma during flow in a dyke. AM J SCI 282, 856–85.CrossRefGoogle Scholar
Esang, C. B. & Piper, J. D. A. 1984. Paleonegmatism of the Carboniferous E–W swarm in Argyllshire. SCOTT J GEOL 20, 309–14.Google Scholar
Fitton, J. G. & Dunlop, H. M. 1985. The Cameroon line, West Africa, and its bearing on the origin of oceanic and continental alkali basalt. EARTH PLAN SCI LETT 72, 23–38.CrossRefGoogle Scholar
Francis, E. H. 1983. Carboniferous-Permian igneous rocks. In Craig, G. Y. (ed.) Geology of Scotland, 2nd edn., 297–324. Edinburgh: Scottish Academic Press.Google Scholar
Gallagher, M. J. 1963. Lamprophyre dykes from Argyll. MINERAL MAG 33, 415–30.Google Scholar
Groome, D. R. & Hall, A. 1974. The geochemistry of the Devonian lavas of the northern Lorne Plateau, Scotland. MINERAL MAG 39, 621–40.Google Scholar
Hendry, G. L. 1982. University of Birmingham XRSL 15.Google Scholar
Hendry, G. L. 1983. University of Birmingham XRSL 16.Google Scholar
Leake, B. E., Hendry, G. L. et al. 1969. The chemical analysis of rock powders by automatic X-ray fluorescence. CHEM GEOL 5, 7–86.Google Scholar
Leat, P. T., Thompson, R. N., Morrison, M. A., Hendry, G. L. and Trayhorn, S. C. 1987. Geodynamic significance of post-Variscan intrusive and extrusive potassic magmatism in SW England. TRANS R SOC EDINBURGH: EARTH SCI 77, 349–60.CrossRefGoogle Scholar
Lee, G. W. & Bailey, E. B. 1925. The Pre-Tertiary geology of Mull, Loch Aline and Oban. MEM GEOL SURV SCOTLAND.Google Scholar
Mattey, D. P., Gibson, I. L., Marriner, G. F. & Thompson, R. N. 1977. The diagnostic geochemistry, relative abundances, and spatial distribution of high-calcium low-alkaline olivine tholeiite dykes in the lower Tertiary regional swarm of the Isle of Skye, NW Scotland. MINERAL MAG 41, 273–85.Google Scholar
Macdonald, R. 1980. Trace element evidence for mantle heterogeneity beneath the Scottish Midland Valley in the Carboniferous and Permian. PHILOS TRANS R SOC LONDON A297, 245–257.Google Scholar
Morrison, M. A., Thompson, R. N., Gibson, I. L. & Marriner, G. F. 1980. Lateral chemical heterogeneity in the Paleocene upper mantle beneath the Scottish Hebrides. PHILOS TRANS R SOC LONDON A297, 229–44.Google Scholar
Pankhurst, R. J. 1982. Geochronological tables for British igneous rocks. In Sutherland, D. S. (ed.) Igneous Rocks of the British Isles, 575–581. Chichester: J. Wiley & Sons.Google Scholar
Praegel, N.-O. 1981. Origin of ultramafic inclusions and megacrysts in a monchiquitic dyke at Streap, Inverness-shire, Scotland. LITHOS 14 305–22Google Scholar
Richey, J. E. 1939. The dykes of Scotland. TRANS EDINBURGH GEOL SOC 13, 393–435.Google Scholar
Rock, N. M. S. 1983. The Permo-Carboniferous camptonitemonchiquite dyke-suite of the Scottish Highland and Islands: distribution, field and petrological aspects. REP INST GEOL SCI No. 82/14.Google Scholar
Rock, N. M. S. 1984. Nature and origin of calc-alkaline lamprophyres, minettes, vogesites, kersantites and spessartites. TRANS R SOC EDINBURGH: EARTH SCI 74, 193–227.Google Scholar
Rock, N. M. S., Gasgarth, J. W. & Rundle, C. C. 1986. Late Caledonian dyke-swarms in southern Scotland: A regional zone of primitive K-rich lamprophyres and associated vents. J GEOL 94, 505–522.CrossRefGoogle Scholar
Smith, D. I. 1979. Caledonian minor intrusions of the N Highlands of Scotland. In Harris, A. L., Holland, C. H. & Leake, B. E. (eds) The Caledonides of the British Isles—reviewed, 683–97. SPEC PUBL GEOL SOC LONDON.Google Scholar
Speight, J. M. & Mitchell, J. G. 1979. The Permo-Carboniferous dyke-swarm of northern Argyll and its bearing on dextral displacement on the Great Glen Fault. J GEOL SOC LONDON 136, 3–11.CrossRefGoogle Scholar
Speight, J. M. & Mitchell, J. G. 1980. Discussion on the Permo-Carboniferous dyke-swarm of northern Argyll and its bearing on dextral displacement on the Great Glen Fault. J GEOL SOC LONDON 137, 99–100.Google Scholar
Stephens, W. E. & Halliday, A. N. 1985. Geochemical contrasts between late Caledonian granitoid plutons of northern, central and southern Scotland. TRANS R SOC EDINBURGH:EARTH SCI 75, 1–15.Google Scholar
Thirlwall, M. F. 1981. Implications for Caledonian plate tectonic models of chemical data from volcanic rocks of the British Old Red Sandstone. J GEOL SOC LONDON 138, 123–38.CrossRefGoogle Scholar
Thirlwall, M. F. 1982. Systematic variation in chemistry and Nd-Sm isotopes across a Caledonian calc-alkaline volcanic arc: implications for source materials. EARTH PLANET SCI LETT 58, 27–50.Google Scholar
Thompson, R. N. 1982. Magmatism of the British Tertiary province. SCOTT J GEOL 18, 49–107.Google Scholar
Thompson, R. N., Morrison, M. A., Hendry, G. L. & Parry, S. J. 1984. An assessment of the relative roles of crust and mantle in magma genesis: an elemental approach. PHILOS TRANS R SOC LONDON A310, 549–90.Google Scholar
Upton, B. G. J. 1982. Carboniferous and Permian volcanism in the stable foreland. In Sutherland, D. S. (ed.) Igneous Rocks of the British Isles, 255–75. Chichester: J. Wiley & Sons.Google Scholar
Van der Voo, R. & Scotese, C. 1981. Paleomagnetic evidence for a large (∼2000 km) sinistral offset along the Great Glen fault during Carboniferous time. GEOLOGY 9, 583–89.2.0.CO;2>CrossRefGoogle Scholar
Van der Voo, R. & Scotese, C. 1982a. Comment and reply on ‘Paleomagnetic evidence for a large (∼2000 km) sinistral offset along the Great Glen fault during Carboniferous time.’ GEOLOGY 10, 487–88.2.0.CO;2>CrossRefGoogle Scholar
Van der Voo, R. & Scotese, C. 1982b. Comment and reply on ‘Paleomagnetic evidence for a large (∼2000 km) sinistral offset along the Great Glen fault during Carboniferous time’. GEOLOGY 10, 604–607.Google Scholar
Wright, A. E. & Bowes, D. R. 1979. Geochemistry of the appinite suite. In Harris, A. L., Holland, C. H. & Leake, B. E. (eds) The Caledonides of the British Isles—reviewed, 699–703. SPEC PUBL GEOL SOC LONDON.CrossRefGoogle Scholar