A precise U-Pb zircon age for the Inishtrahull syenitic gneiss, County Donegal, Ireland

  title={A precise U-Pb zircon age for the Inishtrahull syenitic gneiss, County Donegal, Ireland},
  author={J. Stephen Daly and Roddy Muir and Robert A. Cliff},
  journal={Journal of the Geological Society},
  pages={639 - 642}
Smd zircon fractions from the deformed alkaline igneous complex on Inishtrahd, County Donegal, Ireland yield near-concordant U-Pb ages of 1779 * 3 Ma interpreted as dating the igneous crystallization of the gneiss's precursor. Sm-Nd depleted mantle model ages range from 1912 Ma to 1978 Ms. The similarity of the model ages and the crystallization age indicates that the protoliths were derived from a depleted mantle source essentially uncontaminated by older crust. The isotopic data confirm… Expand

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