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Early Palaeozoic metamorphic history of the Midland Valley, Southern Uplands–Longford-Down massif and the Lake District, British Isles

Published online by Cambridge University Press:  03 November 2011

G. J. H. Oliver ,
J. L. Smellie ,
L. J. Thomas ,
D. M. Casey ,
A. E. S. Kemp ,
L. J. Evans ,
J. R. Baldwin  and
B.C. Hepworth
G. J. H. Oliver
Affiliation:
Department of Geology, University of St Andrews, St Andrews KY16 9ST, Scotland.
J. L. Smellie
Affiliation:
British Antarctic Survey, Madingley Road, Cambridge CB3 0ET, England.
L. J. Thomas
Affiliation:
Department of Geology, University of St Andrews, St Andrews KY16 9ST, Scotland.
D. M. Casey
Affiliation:
British Petroleum Development Limited, Fairburn Industrial Estate, Dyce, Aberdeen AB2 0PD, Scotland.
A. E. S. Kemp
Affiliation:
Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland.
L. J. Evans
Affiliation:
Department of Geology, University of St Andrews, St Andrews KY16 9ST, Scotland.
J. R. Baldwin
Affiliation:
Department of Geology, University of St Andrews, St Andrews KY16 9ST, Scotland.
B.C. Hepworth
Affiliation:
Robertson Research Laboratories, Tyn-y-Coed, Llandudno LL30 ISA, Wales.
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Abstract

A model for the early Palaeozoic metamorphic history of the Midland Valley and adjacent areas to the S in Scotland, England and Ireland is based on the results of new field mapping, thin section petrography, electron probe microanalysis, X-ray diffractometry, conodont and palynomorph colouration and graptolite reflectance measurement.

The oldest metamorphic rocks of the Midland Valley of Scotland, excluding xenoliths in post-Silurian lavas, are possibly the blueschist occurrences in the melange unit of the Ballantrae complex. These may be tectonised remnants of (?)pre-Arenig ocean-floor subducted during closure of the Iapetus Ocean. In the early Ordovician, the melange terrane was dynamothermally metamorphosed during obduction of newly-formed ocean crust. The obduction process piled up a thick sequence of various ocean-floor types such that burial metamorphism in parts reached pumpellyite-actinolite facies; elsewhere prehnite-pumpellyite and zeolite facies was attained.

Whilst the Midland Valley acted as an inter- or fore-arc basin during the Late Ordovician and Silurian and experienced burial metamorphism, an accretionary prism was formed to the S. Accretion, tectonic burial and metamorphism of ocean-floor and trench sediment was continuous in the Southern Uplands and the Longford-Down massif of Ireland through Late Ordovician to Late Silurian times. Rocks at the present-day surface vary from zeolite facies to prehnitepumpellyite facies. Silurian trench-slope basin sediments can be recognised in part by their lower grade of burial metamorphism. Greenschist facies rocks of the prism probably lie close to the surface.

The Lake District island-arc terrane of Northern England has an early Ordovician history of burial metamorphism up to prehnite-pumpellyite facies. The Late Ordovician and Silurian metamorphic history is one of sedimentary burial complicated by tectonism and intrusion of granite plutons to a relatively high level. The Iapetus suture is marked by a weak contrast in metamorphic grade.

Keywords

blueschistconodont colourelectron microprobeIapetus Oceanilliteparatectonic Caledonidesprehnite-pumpellyitereflectancezeolite
Type
Southern Uplands, granites and synthesis
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 75 , Issue 2: Deep Geology of the Midland Valley of Scotland and Adjacent Regions. Bicentenary Symposium , 1984 , pp. 245 - 258
Copyright
Copyright © Royal Society of Edinburgh 1984

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References

Anderton, R., Bridges, P. H., Leeder, M. R. & Seilwood, B. W. 1979. A Dynamic Stratigraphy of the British Isles. London: Allen & Unwin.Google Scholar
Bailey, E. B. & McCallien, W. J. 1957. The Ballantrae serpentine, Ayrshire. TRANS GEOL SOC EDINBURGH 17, 33–53.Google Scholar
Balsillie, D. 1932. The Ballantrae Igneous Complex, South Ayrshire. GEOL MAG 69, 107–31.Google Scholar
Balsillie, D. 1937. Further observations on the Ballantrae igneous complex, South Ayrshire. GEOL MAG 74, 20–33.Google Scholar
Bamford, D., Nunn, K., Prodehl, C. & Jacobs, B. 1977. L.I.S.P.B. III upper crustal structure of northern Britain. J GEOL SOC LONDON 133, 481–8.CrossRefGoogle Scholar
Barnes, I. & O'Neil, J. R. 1969. The relationship between fluids in some fresh Alpine-type ultramafics and possible modern serpentinization, western United States. BULL GEOL SOC AM 80, 1947–60.Google Scholar
Barrett, T. J., Jenkyns, H. C., Leggett, J. K. & Robertson, A. H. F. 1982. Comment and reply on ‘Age and origin of Ballantrae ophiolite and its significance to the Caledonian orogeny and the Ordovician time scale’. GEOLOGY 10, 331–3.Google Scholar
Bergstrom, S. M. 1980. Conodonts as palaeotemperature tools in Ordovician rocks of the Caledonides and adjacent areas in Scandinavia and the British Isles. FORH GEOL FOREN STOCKHOLM 102, 377–92.Google Scholar
Birch, F. 1960. The velocity of compressional waves in rocks to 10 Kilobars, Part 1. J GEOPHYS RES 66, 1083–102.Google Scholar
Bloxam, T. W. 1954. Rodingite from the Girvan-Ballantrae Complex. MINERAL MAG 30, 525–8.Google Scholar
Bloxam, T. W. 1955. The origin of the Girvan-Ballantrae beerbachites. GEOL MAG 92, 329–36.CrossRefGoogle Scholar
Bloxam, T. W. 1968. The petrology of Byne Hill, Ayrshire. TRANS R SOC EDINBURGH 68, 16–9.Google Scholar
Bloxam, T. W. 1980. Amphibolite contact zones, amphibolite xenoliths and blueschists associated with serpentinite in the Girvan-Ballantrae Complex, south-west Scotland. ARCH SCI 33, 291–9.Google Scholar
Bloxam, T. W. & Allen, J. B. 1960. Glaucophane schist, eclogite and associated rocks from Knockormal in the Girvan–Ballantrae Complex, south Ayrshire. TRANS R SOC EDINBURGH 64, 1–27.Google Scholar
Bluck, B. J. 1978. Geology of a continental margin. 1: the Ballantrae complex. In Bowes, D. R. & Leake, B. E. (eds) Crustal evolution in northwestern Britain and adjacent regions, 151–62. GEOL J SPEC ISSUE 10.Google Scholar
Bluck, B. J. 1982. Hyalotuff deltaic deposits in the Ballantrae ophiolite of SW Scotland: evidence for crustal position of the lava sequence. TRANS R SOC EDINBURGH EARTH SCI 72, 217–28.Google Scholar
Bluck, B. J., Halliday, A. N., Aftalion, M. & Mclntyre, R. M. 1980. Age and origin of Ballantrae ophiolite and its significance to the Caledonian orogeny and Ordovician time scale. GEOLOGY 8, 492–5.Google Scholar
Bott, M. H. P. 1974. The geological interpretation of a gravity survey of the English Lake District and the Vale of Eden. J. GEOL SOC LONDON 130, 309–31.CrossRefGoogle Scholar
Cann, J. R. 1979. Metamorphism in the ocean crust. In Talwani, M., Harrison, C. G. & Hayes, D. E. (eds) Deep drilling results in the Atlantic Ocean: ocean crust, 230–8. AM GEOPHYS UNION, MAURICE EWING SER 2.Google Scholar
Casey, D. M. 1983. Geological studies in the Central Belt of the eastern Southern Uplands of Scotland. University of Oxford, D. Phil, thesis (unpubl.).Google Scholar
Christensen, N. I. 1965. Compressional wave velocities in metamorphic rocks at pressures to 10 kilobars. J GEOPHYS RES 70, 6147–64.Google Scholar
Church, W. R. & Gayer, R. A. 1973. The Ballantrae ophiolite. GEOL MAG 110, 157–80.Google Scholar
Coleman, R. G. 1977. Ophiolites Ancient oceanic lithosphere? Berlin: Springer-Verlag.Google Scholar
Coleman, R. G. & Keith, T. E. 1971. A chemical study of serpentinization—Burro Mountain, California. J PETROL 12, 311–28.Google Scholar
Coombs, D. S. 1960. Lower grade mineral facies in New Zealand. REP 21ST INT GEOL CONGR 13, 339–51.Google Scholar
Coombs, D. S. 1974. On the mineral facies of spilitic rocks and their genesis. In Amstutz, G. C. (ed.) Spilites and spilitic rocks, 373–86. Berlin: Springer-Verlag.Google Scholar
Coombs, D. S., Horodyski, R. J. & Naylor, R. S. 1970. Occurrence of prehnite-pumpellyite facies metamorphism in northern Maine. AM J SCI 268, 142–56.Google Scholar
Craig, L. 1983. Ordovician rocks of the North Co. Down. Queen's University of Belfast, Ph.D. thesis (unpubl.).Google Scholar
Craig, G. Y. & Walton, E. K. 1959. Sequence and structure in the Silurian rocks of Kirkcudbrightshire. GEOL MAG 96, 209–20.Google Scholar
Curry, G. B., Bluck, B. J., Burton, C. J., Ingham, J. K., Siveter, D. J. & Williams, A. 1984. Age, evolution and tectonic history of the Highland Border Complex, Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 113–33.Google Scholar
Davey, F. J. & Broadbent, M. 1980. Seismic refraction measurements in Fiordland southwest New Zealand. N Z J GEOL GEOPHYS 23, 395–406.Google Scholar
Dewey, J. F. 1969. Evolution of the Appalachian/Caledonian orogen. NATURE 222, 124–9.CrossRefGoogle Scholar
Dunoyer de Segonzac, G. 1970. The transformation of clay minerals during diagenesis and low-grade metamorphism: a review. SEDIMENTOLOGY 15, 281–346.Google Scholar
Epstein, A. G., Epstein, J. B. & Harris, L. D. 1977. Conodont colour alteration—an index to organic metamorphism. PROF PAP U S GEOL SURV 995.Google Scholar
Fettes, D. J. 1978. Caledonian and post-Caledonian metamorphism in the United Kingdom and Ireland. In Zwart, H. J., Sobolev, V. S. & Niggli, E. (eds) Metamorphic map of Europe. 1:250,000 Explanatory text. Paris: Unesco.Google Scholar
Garcia, S. G. & Camazano, M. S. 1968. Differentiation of kaolinite from chlorite by treatment with dimethyl-sulphoxide. CLAY MINERALS 7, 447–50.Google Scholar
Garrick, R. A. & Hatherton, T. 1973. Seismic velocity studies in the Southern Alps, New Zealand. N Z J GEOL GEOPHYS 16, 973–95.Google Scholar
Greig, D. C. 1971. British Regional Geology, the South of Scotland, 3rd edn. Edinburgh: H.M.S.O.Google Scholar
Hall, J., Powell, D. W., Warner, M. R., El-Isa, Z. H. M., Adesanya, O. & Bluck, B. J. 1983. Seismological evidence for shallow crystalline basement in the Southern Uplands of Scotland. NATURE 305, 418–20.Google Scholar
Hamilton, P. J., Bluck, B. J. & Halliday, A. N. 1984. Sm–Nd ages from the Ballantrae complex, SW Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 183–7.Google Scholar
Hepworth, B. C. 1981. Geology of the Ordovician rocks between Leadhills and Abington, Lanarkshire. University of St Andrews, Ph.D. thesis (unpubl.).Google Scholar
Hepworth, B. C., Oliver, G. J. H. & McMurtry, M. J. 1982. Sedimentology, volcanism, structure and metamorphism of the northern margin of a Lower Palaeozoic accretionary complex—Bail Hill-Abington area of the Southern Uplands of Scotland. In Leggett, J. K. (ed.) Trench Fore-Arc Geology, 521–33. SPEC PUBL GEOL SOC LONDON 10.Google Scholar
Holub, F. V., Klápová, H., Bluck, B. J. & Bowes, D. R. 1984. Petrology and geochemistry of post-obduction dykes of the Ballantrae complex, S W Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 211–223.Google Scholar
Hsu, K. J. 1974. Melanges and their distinction from olistostromes. In Dott, R. H. & Shaver, R. H. (eds) Modern and Ancient Geosynclinal Sedimentation, 321–33. SOC ECON PALAEONT MINERAL SPEC PUBL 19.Google Scholar
Ingham, K. 1978. Geology of a continental margin. 2: In Bowes, D. R. and Leake, B. E. (eds) Crustal evolution in northwestern Britain and adjacent regions, 29–34. GEOL J SPEC ISSUE 10.Google Scholar
Jaeger, J. C. 1957. The temperature in the neighbourhood of a cooling intrusive sheet. AM J SCI 255, 306–18.Google Scholar
Jelínek, E., Souček, J., Bluck, B. J., Bowes, D. R. & Treloar, P. J. 1980. Nature and significance of beerbachites in the Ballantrae ophiolite, SW Scotland. TRANS R SOC EDINBURGH EARTH SCI 71, 159–79.Google Scholar
Jelínek, E., Souček, J., Řanda, Z., Jakeš, P., Bluck, B. J. & Bowes, D. R. 1984. Geochemistry of peridotites, gabbros and trondhjemites of the Ballantrae complex, SW Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 193–209.Google Scholar
Jones, C. M. 1977. The Ballantrae complex as compared to the ophiolites of Newfoundland. University of Wales, Ph.D. thesis (unpubl.).Google Scholar
Kisch, H. J. 1974. Anthracite and meta-anthracite coal ranks associated with ‘anchimetamorphism’ and ‘very-low-stage’ metamorphism, I, II, & III. PROC (K) NEDERL AKAD WET B 77, 81–118.Google Scholar
Kisch, H. J. 1981. Coal rank and illite crystallinity associated with the zeolite facies of Southland and the pumpellyite-bearing facies of Otago, southern New Zealand. N Z J GEOL GEOPHYS 24, 349–60.Google Scholar
Larsen, G. & Chillinger, G. V. 1979. Diagenesis in sediments and sedimentary rocks. Developments in Sedimentology, 25A. Amsterdam: Elsevier.Google Scholar
Leake, B. E. 1978. Nomenclature of amphiboles. AM MINERAL 63, 1023–52.Google Scholar
Leggett, J. K., McKerrow, W. S. & Soper, N. J. 1983. A model for the crustal evolution of Southern Scotland. TECTONICS 2, 187–210.Google Scholar
Leggett, J. K., McKerrow, W. S. & Eales, M. H. 1979. The Southern Uplands of Scotland: a Lower Palaeozoic accretionary prism. J GEOL SOC LONDON 136, 755–70.Google Scholar
Lewis, A. D. 1975. The geochemistry and geology of the Girvan–Ballantrae ophiolite and related Ordovician volcanics in the Southern Uplands of Scotland. University of Wales, Ph.D. thesis (unpubl.).Google Scholar
McKerrow, W. S., Leggett, J. K. & Eales, M. H. 1977. Imbricate thrust model of the Southern Uplands of Scotland. NATURE 263, 304–6.Google Scholar
Mevel, C. 1981. Occurrences of pumpellyite in hydrothermally altered basalts from the Verna Fracture Zone (mid-Atlantic Ridge). CONTRIB MINERAL PETROL 76, 386–93.Google Scholar
Mitchell, A. H. G. 1984. The British Caledonides: interpretation from Cenozoic analogues. GEOL MAG 121, 35–46.Google Scholar
Oliver, G. J. H. 1978. Prehnite-pumpellyite facies metamorphism in County Cavan, Ireland. NATURE 274, 242–3.Google Scholar
Oliver, G. J. H. & Leggett, J. K. 1980. Metamorphism in an accretionary prism: prehnite-pumpellyite facies metamorphism of the Southern Uplands of Scotland. TRANS R SOC EDINBURGH EARTH SCI 71, 235–46.Google Scholar
Padan, A., Kisch, H. J. & Shagam, R. 1982. Use of the lattice parameter b0 of dioctahedral illite/muscovite for the characterization of P/T gradients of incipient metamorphism. CONTRIB MINERAL PETROL 79, 85–95.Google Scholar
Robertson, A. H. F. & Henderson, W. G. 1984. Geochemical evidence for the origins of igneous and sedimentary rocks of the Highland Border, Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 135–50.Google Scholar
Rust, B. C. 1965. The sedimentology and diagenesis of Silurian turbidites in southeast Wigtownshire, Scotland. SCOTT J GEOL 1, 231–46.Google Scholar
Schiffman, P. & Liou, J. G. 1980. Synthesis and stability relations of Mg–Al pumpellyite, Ca4Al5MgSi6O21(OH)7. J PETROL 21, 441–74.Google Scholar
Shiells, K. A. G. & Dearman, W. R. 1963. Tectonics of the Coldingham Bay area of Berwickshire in the Southern Uplands of Scotland. PROC YORKSHIRE GEOL SOC 34, 209–34.Google Scholar
Shiells, K. A. G. & Dearman, W. R. 1966. On the possible occurrences of Dalradian rocks in the Southern Uplands of Scotland. SCOTT J GEOL 2, 231–42.Google Scholar
Smellie, J. L. & Stone, P. 1984. Eclogite in the Ballantrae complex; a garnet-clinopyroxenite segregation in mantle harzburgite? SCOTT J GEOL (in press).Google Scholar
Soper, N. J. & Mosely, F. 1978. Structure. In Mosely, F. (ed.) The Geology of the Lake District, 45–67. Leeds: Yorkshire Geological Society.Google Scholar
Spray, J. G. & Williams, G. D. 1980. The sub-ophiolite metamorphic rocks of the Ballantrae igneous complex, S.W. Scotland. J. GEOL SOC LONDON 137, 359–68.Google Scholar
Stone, P., Lambert, J. L. M., Carruthers, R. M. & Smellie, J. L. 1984. Concealed ultramark bodies in the Ballantrae complex, southwest Scotland; borehole results. REP BR GEOL SURV 16, 41–5.Google Scholar
Thirlwall, M. F. & Bluck, B. J. 1984. Sm–Nd isotope and chemical evidence that the Ballantrae “ophiolite”, S.W. Scotland, is polygenetic. GEOL SOC LONDON SPEC PUBL 13, 215–30.Google Scholar
Thorez, J. 1976. Practical identification of clay minerals. A handbook for teachers and students in clay mineralogy. Dison (Belgium): G. Lelotte.Google Scholar
Treloar, P. J., Bluck, B. J., Bowes, D. R. & Dudek, A. 1980. Hornblende-garnet metapyroxenite beneath serpentinite in the Ballantrae complex of SW Scotland and its bearing on the depth provenance of obducted oceanic lithosphere. TRANS R SOC EDINBURGH EARTH SCI 71, 201–12.Google Scholar
Turner, F. J. 1968. Metamorphic Petrology—Mineralogy and Field Aspects, 1st edn. New York: McGraw Hill.Google Scholar
Viereck, L. G., Griffin, B. J., Schmincke, H. U. & Pritchard, R. G. 1982. Volcaniclastic rocks of the Reydarfjordur Drill Hole, eastern Iceland, 2, alteration. J GEOPHYS RES 87, 6459–76.Google Scholar
Wadge, A. J. 1978. Devonian. In Moseley, F. (ed.) The Geology of the Lake District, 164–7. Leeds: Yorkshire Geological Society.Google Scholar
Walton, E. K. 1963. Sedimentation and structure in the Southern Uplands. In Johnson, M. R. W. & Stewart, F. H. (eds) The British Caledonides, 71–97. Edinburgh: Oliver & Boyd.Google Scholar
Watson, S. W. 1976. The sedimentary geochemistry of the Moffat Shales—a carbonaceous sequence in the Southern Uplands of Scotland. University of St Andrews, Ph.D. thesis (unpubl.).Google Scholar
Weber, K. 1972. Kristallinität des Illits in Tonschiefern und andere Kriterien schwacher Metamorphose im nordöstlichen Rheinischen Schiefergebirge. NEUES JAHRB GEOL PALAEONTOL 141, 333–63.Google Scholar
Wicks, F. J. & Whittaker, E. J. W. 1977. Serpentine textures & serpentinisation. CAN MINERAL 15, 449–88.Google Scholar
Wilkinson, J. H. & Cann, J. R. 1974. Trace elements and tectonic relationships of basaltic rocks in the Ballantrae igneous complex, Ayrshire. GEOL MAG 111, 35–41.CrossRefGoogle Scholar
Williams, A. 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. MEM GEOL SOC LONDON 3.Google Scholar