Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada

@article{Bowring1999PriscoanG,
  title={Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada},
  author={Samuel A. Bowring and Ian S. Williams},
  journal={Contributions to Mineralogy and Petrology},
  year={1999},
  volume={134},
  pages={3-16}
}
Abstract Ancient crustal rocks provide the only direct evidence for the processes and products of early Earth differentiation. SHRIMP zircon U-Th-Pb dating has identified, amongst the Acasta gneisses of the western Slave Province, Canada, two metatonalites and a metagranodiorite that have igneous ages of 4002 ± 4, 4012 ± 6 and 4031 ± 3 Ga respectively. These are the first identified Priscoan terrestrial rocks. A record of metamorphic events at ∼3.75, ∼3.6 and ∼1.7 Ga also is preserved. These… 
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