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U–Pb isotopic ages from a granulite-facies xenolith from Partan Craig in the Midland Valley of Scotland

Published online by Cambridge University Press:  03 November 2011

A. N. Halliday ,
M. Aftalion ,
Brian G. J. Upton ,
Peder Aspen  and
J. Jocelyn
A. N. Halliday
Affiliation:
Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QU, Scotland.
M. Aftalion
Affiliation:
Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QU, Scotland.
Brian G. J. Upton
Affiliation:
Grant Institute of Geology, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JW, Scotland.
Peder Aspen
Affiliation:
Grant Institute of Geology, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JW, Scotland.
J. Jocelyn
Affiliation:
Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QU, Scotland.
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Abstract

U–Pb isotopie data for zircons from a granulite-facies xenolith from a volcanic vent at Partan Craig in the southeastern part of the Midland Valley of Scotland display evidence of an early Proterozoic (>2·0 Ga) component. The xenolith is probably relict metasediment and the data therefore indicate old detritus in the sedimentary precursor. The exact ages of sedimentation and metamorphism are uncertain but these must be compatible with Sm–Nd data on similar xenolithic fragments from the same locality which constrain the ages to c. 1–0 Ga or younger.

Keywords

basementCaledonianCarboniferousGrenvillianlower crustProterozoicSm–NdU–Pbvolcanic ventzircon
Type
Regional framework
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. 71 - 74
Copyright
Copyright © Royal Society of Edinburgh 1984

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References

Aftalion, M. & van Breemen, O. 1980. U–Pb zircon, monazite and Rb–Sr whole rock systematics of granitic gneiss and psammitic to semi-pelitic host gneiss from Glenfinnan, Northwestern Scotland. CONTRIB MINERAL PETROL 72, 87–98.CrossRefGoogle Scholar
Allègre, C. J., Albarède, F., Grünenfelder, M. & Köppel, V. 1974. 238U/207Pb–232Th/208Pb zircon geochronology in Alpine and non-Alpine environments. CONTRIB MINERAL PETROL 43, 163–94.CrossRefGoogle Scholar
Bluck, B. J., Halliday, A. N., Aftalion, M. & Macintyre, R. M. 1980. Age and origin of Ballantrae ophiolite and its significance to the Caledonian orogeny and the Ordovician time scale. GEOLOGY 8, 492–5.2.0.CO;2>CrossRefGoogle Scholar
Davies, G. R., Upton, B. G. J. & Strogen, P. 1984. Sr and Nd isotope evidence for age and origin of crustal xenoliths from the Midland Valley of Scotland and central Ireland (abstract). TRANS R SOC EDINBURGH: EARTH SCI 75, 297.Google Scholar
Davis, G. L. & Grew, E. S. 1978. Age of zircon from a crustal xenolith, Kilbourne Hole, New Mexico. CARNEGIE INST WASHINGTON YEARB 77, 897–8.Google Scholar
Halliday, A. N. 1984. Coupled Sm–Nd and U–Pb systematics in late Caledonian granites and the basement under northern Britain. NATURE 307, 229–33.CrossRefGoogle Scholar
Halliday, A. N., Aftalion, M., van Breemen, O. & Jocelyn, J. 1979. Petrogenetic significance of Rb–Sr and U–Pb isotopie systems in the 400 Ma old British Isles granitoids and their host. In Harris, A. L., Holland, C. H. & Leake, B. E. (eds) The Caledonides of the British Isles—reviewed, 651–61. GEOL SOC LONDON SPEC PUB 8.Google Scholar
Hamilton, P. J., Evensen, N. M., O'Nions, R. K. & Tarney, J. 1979. Sm–Nd systematics of Lewisian Gneisses: implications for the origin of granulites. NATURE 277, 25–8.CrossRefGoogle Scholar
Hunter, R. H., Upton, B. G. J. and Aspen, P. 1984. Meta-igneous granulite and ultramafic xenoliths from basalts of the Midland Valley of Scotland: petrology and mineralogy of the lower crust and upper mantle. TRANS R SOC EDINBURGH EARTH SCI 75, 75–84.CrossRefGoogle Scholar
Longman, C. D., Bluck, B. J., van Breemen, O. & Aftalion, M. 1982. Ordovician conglomerates: constraints on the time scale. In Odin, G. S. (ed.) Numerical dating in stratigraphy, 807–9. London: Wiley.Google Scholar
O'Nions, R. K., Hamilton, P. J. & Hooker, P. J. 1983. A Nd isotope investigation of sediments related to crustal development in the British Isles. EARTH PLANET SCI LETT 63, 229–40.CrossRefGoogle Scholar
Pidgeon, R. T. & Aftalion, M. 1978. Cogenetic and inherited zircon U–Pb systems in granites: Palaeozoic granites of Scotland and England. In Bowes, D. R. and Leake, B. E. (eds) Crustal evolution in northwestern Britain and adjacent regions, 183–248. GEOL J SPEC ISSUE 10.Google Scholar
Pidgeon, R. T. & Bowes, D. R. 1972. Zircon U–Pb ages of granulites from the Central Region of the Lewisian, N.W. Scotland. GEOL MAG 109, 247–58.Google Scholar
van Breemen, O. & Hawkesworth, C. J. 1980. Sm–Nd isotopie study of garnets and their metamorphic host rocks. TRANS R SOC EDINBURGH: EARTH SCI 71, 97–102.Google Scholar
Wetherill, E. W. 1956. Discordant uranium-lead ages. TRANS AM GEOPHYS UN 37, 320–6.Google Scholar
Upton, B. G. J., Aspen, P. & Hunter, R. H. 1984. Xenoliths and their implications for the deep geology of the Midland Valley of Scotland and adjacent regions. TRANS R SOC EDINBURGH: EARTH SCI 75, 65–70.Google Scholar
York, D. 1969. Least squares fitting of a straight line with correlated errors. EARTH PLANET SCI LETT 5, 320–4.CrossRefGoogle Scholar