Terrane analysis along a Neoproterozoic active margin of Gondwana: insights from U-Pb zircon geochronology

  • Strachan R
  • Collins A
  • Buchan C
 et al. 
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The tectonic affinities of terranes in accretionary orogens can be evaluated using geochronological techniques. U-Pb zircon data obtained from paragneisses of the Coedana Complex (Anglesey) and the Malverns Complex, southern Britain, indicate that they were deposited during the mid- to late Neoproterozoic and have a comparable Amazonian provenance. Metamorphism of the Coedana gneisses occurred at 666 ± 7 Ma, similar to the age of metamorphism in the Malverns Complex. Anglesey therefore probably evolved in proximity to the Avalonian basement of mainland southern Britain during the mid- to late Neoproterozoic and is not a 'suspect terrane' relative to the remainder of Avalonia.

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  • R.A. Strachan

  • A.S. Collins

  • C. Buchan

  • R.D. Nance

  • J.B. Murphy

  • R.S. D'Lemos

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