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The Newer Granite problem: a geotectonic view

Published online by Cambridge University Press:  01 May 2009

N. J. Soper
N. J. Soper
Affiliation:
Department of Geology, University of Sheffield, St George's Square, Sheffield, S1 3JD, U.K.
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Abstract

The Siluro–Devonian suite of granitic plutons in the British Caledonides known as the Newer Granites, together with their associated extrusive rocks, represent one of the most extensively researched examples of calc-alkaline magmatism apparently related to orogeny. Although recent chemical studies have credibly interpreted some of the Scottish intrusions and volcanic rocks as part of a continental-margin magmatic arc generated by the subduction of lapetus oceanic lithosphere beneath Laurentia, insurmountable problems of distribution and timing arise when attempts are made to relate the magmatic activity as a whole to a traditional two-plate collision model for the orogeny.

Newer Granite magmatism is here discussed in the context of more mobilistic models for the post-Grampian evolution of the British Caledonides which involve E–W closure between Laurentia and Baltica, terminated by collision in the Silurian, followed by the northward accretion of Gondwana-derived terranes in the early Devonian. The former produced the Main Caledonian tectonometamorphism of the Northern Highlands of Scotland, the latter the Late Caledonian deformation of the slate belts in the paratectonic Caledonides. These models imply much more complex convergence geometries which can, in principle, account for the whole Newer Granite suite as a series of subduction-generated magmatic arcs overlapping in space and time.

The model proposed involves three late Caledonian magmatic arcs in addition to the Ordovician ‘Borrowdale arc’ which is not considered in this paper. One is related to Laurentia–Baltica convergence with westward subduction beneath the Scottish sector of the Laurentian margin in the Ordovician and Early Silurian, which generated the early members of the Newer Granite suite in the Highlands; a second is related to northward Silurian–early Devonian subduction at the Solway Line, which generated the younger Newer Granites and volcanic rocks north of the Highland Border; and a third, related to northward accretion of the Armorican terrane in early Devonian time, produced intrusive and extrusive magmatism as far south as Southeast Ireland and the English Midlands.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 3 , May 1986 , pp. 227 - 236
Copyright
Copyright © Cambridge University Press 1986

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References

Allen, J. R. L. & Williams, B. P. J. 1981. Stratigraphy of the Townsend Tuff Bed (Lower Old Red Sandstone) in South Wales and the Welsh Borders. Journal of the Geological Society of London 138, 15–29.CrossRefGoogle Scholar
Anderson, T. B. & Cameron, T. D. 1979. A structural profile of Caledonian deformation in Down. In: The Caledonides of the British Isles – Reviewed. Harris, A. L., Holland, C. W. and Leake, B. E., Special Publications of the Geological Society of London 8, 263–7.Google Scholar
Bott, M. H. P. 1978. Deep structure. In The Geology of the Lake District (ed. Moseley, F.), Yorkshire Geological Society Occasional Publication 3, 25–40.Google Scholar
Bradbury, H. J., Smith, R. A. & Harris, A. L. 1976. ‘Older’ granites as time-markers in Dalradian evolution. Journal of the Geological Society of London, 132, 677–84.CrossRefGoogle Scholar
Brewer, M. S., Brook, M. & Powell, D. 1979. Dating of the tectonometamorphic history of the southwestern Moine, Scotland. In: The Caledonides of the British Isles – Reviewed (eds. Harris, A. L., Holland, C. W. and Leake, B. E.), Special Publications of the Geological Society of London 8, 129–38.Google Scholar
Briden, J. C., Turnell, H. B. & Watts, D. R. 1984. British palaeomagnetism, lapetus ocean and the Great Glen Fault. Geology 12, 428–31.2.0.CO;2>CrossRefGoogle Scholar
Brochwicz-Lewinski, W., Pozaryski, W. & Tomczyk, H. 1984. Sinistral strike-slip in central Europe in the Palaeozoic. Polish Academy of Sciences. Publications of the Institute of Geophysics A-13 (160), 3–13.Google Scholar
Brown, G. C., Cassidy, J., Locke, C. A., Plant, J. A. & Simpson, P. S. 1981. Caledonian plutonism in Britain: a summary. Journal of Geophysical Research 86, 10502–14.CrossRefGoogle Scholar
Brown, G. C., Francis, E. H., Kennan, P. & Stillman, C. J. 1985. Caledonian igneous rocks of Britain and Ireland. In: The Nature and Timing ofOrogenic Activity in the Caledonian Rocks of the British Isles (ed. Harris, A. L.), Geological Society of London Memoir 9, 1–15.Google Scholar
Brown, G. C., Thorpe, R. S. & Webb, P. C. 1984. The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources. Journal of the Geological Society of London 141, 411–26.CrossRefGoogle Scholar
Brown, P. E. 1983. Caledonian and earlier magrnatism. In: Geology of Scotland (ed. Craig, G. Y.), pp. 167–204. Edinburgh: Scottish Academic Press.Google Scholar
Cocks, L. R. R. & Fortey, R. A. 1982. Faunal evidence for oceanic separations in the Palaeozoic of Britain. Journal of the Geological Society of London 139, 467–80.CrossRefGoogle Scholar
Cogne, J. & Wright, A. E. 1980. L'orogène cadomien. 26th International Geological Congress, Paris, 6, 29–55.Google Scholar
Dewey, J. F. 1969. Evolution of the Caledonian/Appalachian orogen. Nature, London 222, 124–9.CrossRefGoogle Scholar
Dewey, J. F. 1982. Plate tectonics and the evolution of the British Isles. Journal of the Geological Society of London 139, 371–412.CrossRefGoogle Scholar
England, P. C. & Richardson, S. W. 1977. The influence of erosion upon the mineral facies of rocks from different metamorphic environments. Journal of the Geological Society of London 134, 210–13.CrossRefGoogle Scholar
Halliday, A. N. 1984. Coupled Sm–Nd and U–Pb systematics in late Caledonian granites and the basement under northern Britain. Nature, London 307, 229–33.CrossRefGoogle Scholar
Harland, W. B. 1965. Tectonic evolution of the Arctic–North Atlantic region. Philosophical Transactions of the Royal Society of London A 258, 59–75.Google Scholar
Harland, W. B. 1969. Contribution of Spitzbergen to understanding of tectonic evolution of North Atlantic region. In North Atlantic – Geology and Continental Drift, (ed. Marshall, Kay), Memoir of the American Association of Petroleum Geologists 12, 817–51.Google Scholar
Harland, W. B. 1978. The Caledonides of Svalbard. In Caledonian Appalachian orogen of the North Atlantic region (IGCP Project 27). Geological Survey of Canada Paper 78–13, 3–11.Google Scholar
Harland, W. B. & Gayer, R. A. 1972. The Arctic Caledonides and earlier oceans. Geological Magazine 116, 145–53.CrossRefGoogle Scholar
Harland, W. B. & Wright, N. J. R. 1979. Alternative hypothesis for the pre-Carboniferous evolution of Svalbard. Norsk Polarinstitutt Skrift 167, 89–117.Google Scholar
Harris, A. L. 1983. The growth and structure of Scotland. In Geology of Scotland (ed. Craig, G. Y.), pp. 1–22. Edinburgh: Scottish Academic Press.Google Scholar
Hossack, J. R. & Cooper, M. A. 1985. Collision tectonics in the Scandinavian Caledonides. Journal of the Geological Society of London (in press).Google Scholar
Hutton, D. H. W. 1982. A tectonic model for the emplacement of the main Donegal granite, N.W. Ireland. Journal of the Geological Society of London 139, 615–32.CrossRefGoogle Scholar
Johnson, M. R. W. & Frost, R. T. C. 1977. Fault and lineament patterns in the southern Highlands of Scotland. Geologie en Mijnbouw 56, 287–94.Google Scholar
Johnson, M. R. W., Sanderson, D. J. & Soper, N. J. 1979. Deformation in the Caledonides of England, Ireland and Scotland. In The Caledonides of the British Isles – Reviewed (eds. Harris, A. L., Holland, C. W. and Leake, B. E.), Special Publications of the Geological Society of London 8, 165–86.Google Scholar
Kennedy, M. J. 1979. The continuation of the Canadian Appalachians into the Caledonides of Britain and Ireland. In The Caledonides of the British Isles – Reviewed. Harris, A. L., Holland, C. W. & Leake, B. E. (eds.). Special Publications of the Geological Society of London. 8, 33–64.Google Scholar
Kennedy, W. Q. 1946. The Great Glen fault. Quarterly Journal of the Geological Society of London 102, 41–72.CrossRefGoogle Scholar
Lambert, R. St. J. & McKerrow, W. S. 1976. The Grampian orogeny. Scottish Journal of Geology 12, 271–92.CrossRefGoogle Scholar
Le Bas, M. J. 1982. Geological evidence from Leicestershire on the crust of southern Britain. Transactions of the Leicester Literary and Philosophical Society 76, 54–67.Google Scholar
Leggett, J. K., McKerrow, W. S., Morris, J. H., Oliver, G. J. H. & Phillips, W. E. A. 1979. The northwestern margin of the lapetus Ocean. In The Caledonides of the British Isles – Reviewed (eds. Harris, A. L., Holland, C. W. and Leake, B. E.), 8, 499–511.Google Scholar
Le Pichon, X., Sibuet, J.-C. & Francheteau, J. 1977. The fit of the continents around the North Atlantic ocean. Tectonophysic 38, 169–209.CrossRefGoogle Scholar
McKerrow, W. S. 1982. The northwest margin of the lapetus Ocean during the early Palaeozoic. Memoirs of the American Association of Petroleum Geologists 34, 521–33.Google Scholar
McKerrow, W. S., Leggett, J. K. & Eales, M. H. 1977. Imbricate thrust model of the Southern Uplands of Scotland. Nature, London 267, 237–9.CrossRefGoogle Scholar
Michot, P. 1980. Le segment tectogénique calédonien belge. Academic Royale de Belgique, Mémoire de la Classe des Sciences 43, 1–61.Google Scholar
Murphy, F. C. 1985. Non-axial planar cleavage and Caledonian sinistral transpression in Eastern Ireland. Geological Journal 20, 257–79.CrossRefGoogle Scholar
O'Brien, S. J., Wardle, R. J. & King, A. F. 1983. The Avalon Zone: a pan-African terrane in the Appalachian orogen of Canada. Geological Journal 18, 195–222.CrossRefGoogle Scholar
Oliver, G. J. H., Smellie, J. L., Thomas, L. J., Casey, D. M., Kemp, A. E. S., Evans, L. J., Baldwin, J. R. & Hepworth, B. C. 1984. Early Palaeozoic metamorphic history of the Midland Valley, Southern Uplands–Longford–Down Massif and the Lake District, British Isles. Transactions of the Royal Society of Edinburgh 75, 245–58.CrossRefGoogle Scholar
Pankhurst, R. J., Sutherland, D. S., Brown, G. C. & Pitcher, W. S. 1982. Caledonian granites and diorites of Scotland and Ireland. In Igneous rocks of the British Isles (ed. Sutherland, D. S.), pp. 149–90. London: Wiley.Google Scholar
Perroud, H., van der Voo, R. & Bonhommet, N. 1984. Palaeozoic evolution of the Armorica plate on the basis of palaeomagnetic data. Geology 12, 579–82.2.0.CO;2>CrossRefGoogle Scholar
Phillips, W. E. A., Stillman, C. J. & Murphy, T. 1976. A Caledonian plate tectonic model. Journal of the Geological Society of London 132, 579–609.CrossRefGoogle Scholar
Pitcher, W. S. 1982. Granite type and tectonic environment. In Mountain Building Processes (ed. Hsu, K.), pp. 19–40. London and New York: Academic Press.Google Scholar
Pozaryski, W., Brochwicz-Lewinski, W. & Tomczyk, H. 1982. Sur le caractère hétérochronique de la Ligne Teisseyre-Tornquist, entre Europe centrale et orientale. Comptes Rendus de l'Académie de Sciences de Paris 295, 691–6.Google Scholar
Ross, R. J. and 14 other authors. 1982. Fission-track dating of British Ordovician and Silurian stratotypes. Geological Magazine 119, 155–68.CrossRefGoogle Scholar
Sanderson, D. J., Andrews, J. R., Phillips, W. E. A. & Hutton, D. H. W. 1980. Deformation studies in the Irish Caledonides. Journal of the Geological Society of London 137, 289–302.CrossRefGoogle Scholar
Sanderson, D. J. & Marchini, D. 1984. Transpression. Journal of Structural Geology 6, 449–58.CrossRefGoogle Scholar
Simpson, P. R., Brown, G. C., Plant, J. A. & Ostle, D. 1979. Uranium mineralization and granite magmatism in the British Isles. Philosophical Transactions of the Royal Society of London A 291, 385–412.Google Scholar
Smith, A. G., Hurley, A. M. & Briden, J. C. 1980. Phanerozoic Palaeocontinental World Maps. London: Cambridge University Press.Google Scholar
Smith, D. I. Watson, J. V. 1983. Scale and timing of movements on the Great Glen Fault, Scotland. Geology 11, 523–6.2.0.CO;2>CrossRefGoogle Scholar
Soper, N. J. & Hutton, D. H. W. 1984. Late Caledonian sinistral displacements in Britain: implications for a three-plate collision model. Tectonics 3, 781–94.CrossRefGoogle Scholar
Soper, N. J. & Moseley, F. 1978. Structure. In The Geology of the Lake District, (ed. Moseley, F.), Yorkshire Geological Society Occasional Publication 3, 45–67.Google Scholar
Soper, N. J. & Roberts, D. E. 1971. Age of cleavage in the Skiddaw Slates in relation to the Skiddaw aureole. Geological Magazine 108, 293–302.CrossRefGoogle Scholar
Stephens, W. E. & Halliday, A. N. 1984. Geochemical contrasts between late Caledonian granitoid plutons of northern, central and southern Scotland. Transactions of the Royal Society of Edinburgh 75, 159–274.Google Scholar
Thirlwall, M. F. 1981. Implications for Caledonian plate tectonic models of chemical data from volcanic rocks of the British Old Red Sandstone. Journal of the Geological Society of London 138, 123–38.CrossRefGoogle Scholar
Thorpe, R. S., Beckinsale, R. D., Patchett, P. J., Piper, J. D. A., Davies, G. R. & Evans, J. A. 1984. Crustal growth and late Precambrian-early Palaeozoic plate tectonic evolution of England and Wales. Journal of the Geological Society of London 141, 521–36.CrossRefGoogle Scholar
van der Voo, R., Briden, J. C. & Duff, B. A. 1980. Late Precambrian and Palaeozoic palaeomagnetism of the Atlantic-bordering continents. 26th International Geological Congress of Paris 6, 203–212.Google Scholar
van der Voo, R. & Scotese, C. R. 1981. Palaeomagnetic evidence for a large (⋍ 2000 km) sinistral offset along the Great Glen fault during Carboniferous time. Geology 9, 583–9.2.0.CO;2>CrossRefGoogle Scholar
Watson, J. V. 1984. The ending of the Caledonian Orogeny in Scotland. Journal of the Geological Society of London 141, 193–214.CrossRefGoogle Scholar
Webby, B. D. 1984. Ordovician reefs and climate: a review. In Aspects of the Ordovician System. Palaeontological contributions from the University of Oslo, (ed. Bruton, D. L.) Universitetsforlaget 295, 89–100.Google Scholar
Williams, H. 1978. Geological development of the northern Appalachians: its bearing on the evolution of the British Isles. In Crustal evolution in northwestern Britain and adjacent regions (eds. Bowes, D. R. and Leake, B. E.), Geological Journal of Special Issue 10, 1–22.Google Scholar
Williams, H. & Hatcher, R. D. 1982. Suspect terranes and accretionary history of the Appalachian region. Geology 10, 530–36.2.0.CO;2>CrossRefGoogle Scholar
Yardley, B. W. D., Vine, F. J. & Baldwin, C. T. 1982. The plate tectonic setting of NW Britain and Ireland in late Cambrian and Ordovician times. Journal of the Geological Society of London 139, 455–63.CrossRefGoogle Scholar
Zeigler, P. A. 1982. Geological Atlas of Central and Western Europe. Elsevier.Google Scholar
Zeigler, P. A. 1984. Late Caledonian framework of western and central Europe. Proceedings of the Uppsala Caledonian Symposium In The Caledonian Orogen: Scandinavia and Related Areas (eds. Gee, D. G. and Sturt, B. A.). London: John Wiley.Google Scholar