Hostname: page-component-76fb5796d-skm99 Total loading time: 0 Render date: 2024-04-29T18:09:08.439Z Has data issue: false hasContentIssue false
  • English
  • Français

Pyroxenous greywackes in the Southern Uplands of Scotland and their petrotectonic implications

Published online by Cambridge University Press:  01 May 2009

M. T. Styles ,
M. Perez-Alvarez  and
J. D. Floyd
M. T. Styles
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
M. Perez-Alvarez
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
J. D. Floyd
Affiliation:
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
Get access Rights & Permissions [Opens in a new window]

Abstract

Detrital clinopyroxenes occur abundantly in several greywacke formations in the Southern Uplands, both as single grains and within andesite lithoclasts. Compositionally, these pyroxenes fall into two main groups. Those from the oldest unit, the early Caradoc Galdenoch Formation, were derived from a simple tholeiitic volcanic arc. In contrast, the pyroxenes in the younger Portpatrick (late Caradoc) and Glenlee (Ashgill) Formations and the Gala Group (early Llandovery), show initial strongly calc-alkaline affinities, followed by a more complex calc-alkaline to transitional (calc-alkaline to tholeiitic) volcanic arc signature. The latter may be due to a mixture of calc-alkaline and tholeiitic components. A presently exposed source for the andesites has not yet been established, although the Ballantrae Complex is a potential candidate for a tholeiitic component.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 5 , September 1995 , pp. 539 - 547
Copyright
Copyright © Cambridge University Press 1995

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

Cameron, I. B., Stone, P., & Smellie, J., 1986. Geology of the country around Girvan. Explanation of 1:50000 Sheet 7. London: HMSO for British Geological Survey, 28 pp.Google Scholar
Colman-Sadd, S. P., Stone, P., Swinden, H. S., & Barnes, R. P., 1992. Parallel geological development of Newfoundland and the Lower Palaeozoic terrenes of southern Scotland: an assessment. Transactions of the Royal Society of Edinburgh: Earth Sciences 83, 571–94.CrossRefGoogle Scholar
Coombs, D. S., & Cox, S. C., 1991. Low- and very low-grade metamorphism in southern New Zealand and its geological setting. Geological Society of New Zealand Miscellaneous Publication 58.Google Scholar
Coombs, D. S., Nakamura, Y., & Vuagnat, M., 1976. Pumpellyite-Actinolite facies schists of the Taveyanne formation near Loeche, Valais Switzerland. Journal of Petrology 17, 440–71.CrossRefGoogle Scholar
FLoyd, J. D., 1982. Stratigraphy of a flysch succession: the Ordovician of W Nithsdale, SW Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 73, 1–9.CrossRefGoogle Scholar
Floyd, J. D., & Rushton, A. W. A., 1993. Ashgill greywackes in the Southern Uplands of Scotland: an extension of the Ordovician succession in the Northern Belt. Transactions of the Royal Society of Edinburgh: Earth Sciences 84, 79–85.CrossRefGoogle Scholar
Kelling, G., 1961. The stratigraphy and structure of the Ordovician rocks of the Rhinns of Galloway. Quarterly Journal of the Geological Society of London 117, 37–75.CrossRefGoogle Scholar
Kelling, G., 1962. The petrology and sedimentation of Upper Ordovician rocks in the Rhinns of Galloway, south-west Scotland. Transactions of the Royal Society of Edinburgh 65, 107–37.CrossRefGoogle Scholar
Kelling, G., Davies, P., & Holroyd, J., 1987. Style, scale and significance of sand bodies in the Northern and Central Belts, south-west Southern Uplands. Journal of the Geological Society, London 144, 787–805.CrossRefGoogle Scholar
Leggett, J. K., McKerrow, W. S., & Eales, M. H., 1979. The Southern Uplands of Scotland; a Lower Palaeozoic accretionary prism. Journal of the Geological Society, London 136, 755–70.CrossRefGoogle Scholar
Leterrier, J., Maury, R. C., Thonon, P., Girard, D., & Marchal, M., 1982. Clinopyroxene composition as a method of identification of the magmatic affinities of palaeovolcanic series. Earth and Planetary Science Letters 59, 139–54.CrossRefGoogle Scholar
McMurtry, M. J., 1980. Discussion of: Evidence for Caledonian subduction from greywacke detritus in the Longford-Down inlier. Journal of Earth Sciences of the Royal Dublin Society 2, 209–12.Google Scholar
Morris, J. H., 1987. The Longford-Down Inlier, Ireland and Southern Uplands, Scotland: an Ordovician back-arc basin. Journal of the Geological Society, London 144, 773–86.CrossRefGoogle Scholar
Stone, P., Floyd, J. D., Barnes, R. P., & Lintern, B. C., 1987. A sequential back-arc and foreland basin thrust duplex model for the Southern Uplands of Scotland. Journal of the Geological Society, London 144, 753–64.CrossRefGoogle Scholar
Styles, M. T., Stone, P., & FLOYD, J. D., 1989. Arc detritus in the Southern Uplands: mineralogical characterisation of a ‘missing’ terrane. Journal of the Geological Society, London 146, 397–400.CrossRefGoogle Scholar
Styles, M. T., & Perez-Alvarez, M., 1994. Petrological studies of pyroxenous greywackes from the Southern Uplands of Scotland. British Geological Survey Technical Report, WG/94/9.Google Scholar
Thirlwall, M. F., & Bluck, B. J., 1984. Sr-Nd isotope and chemical evidence that the Ballantrae ‘ophiolite’, SW Scotland, is polygenetic. In Ophiolites and Oceanic Lithosphere (eds Gass, I. G., Lippard, S. J. and Shelton, A. W.), pp. 215–30. Geological Society Special Publication no. 13.Google Scholar