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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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