Encyclopedia of Scientific Dating Methods

Living Edition
| Editors: W. Jack Rink, Jeroen Thompson

Ujaraaluk Unit (Nuvvuagittuq greenstone belt)

Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_112-1

The Ujaraaluk unit is the dominant lithological unit in the Nuvvuagittuq greenstone belt (formerly called Porpoise Cove greenstone belt) in Northeastern Canada. It is interpreted to be as old as 4.39 Ga, which would make it the oldest vestige of crust preserved on Earth (O’Neil et al. 2008, 2012). The Ujaraaluk unit is an amphibolite composed of variable proportions of cummingtonite – plagioclase – biotite ± quartz ± garnet ± anthophyllite (O’Neil et al. 2011). The abundance of cummingtonite gives the Ujaraaluk unit an unusual light beige color compared to most other dark green to black hornblende-dominated greenstone belts in the Northeastern Superior Province. The Ujaraaluk unit was formerly named “Faux-amphibolite” due to this unusual aspect (O’Neil et al. 2007).

The Ujaraaluk is mafic in composition ranging from basaltic to basaltic andesite. It is divided into three distinct geochemical groups following a chemostratigraphy within the Nuvvuagittuq greenstone belt (O’Neil et al. 2011...

Keywords

Greenstone Belt Ultramafic Cumulate Trace Element Profile Geochemical Group Tholeiitic Affinity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Bibliography

  1. Cates, N. L., and Mojzsis, S. J., 2007. Pre-3750 Ma supracrustal rocks from the Nuvvuagittuq supracrustal belt, northern Quebec. Earth and Planetary Science Letters, 255, 9–21.CrossRefGoogle Scholar
  2. Cates, N. L., Ziegler, K., Schmitt, A. K., and Mojzsis, S. J., 2013. Reduced, reused and recycled: Detrital zircons define a maximum age for the Eoarchean (ca.3750–3780 Ma) Nuvvuagittuq Supracrustal belt, Québec (Canada) Earth planet. Science Letters, 362, 283–293.Google Scholar
  3. Darling, J. R., Moser, D. E., Heaman, L., Davis, W. J., Stern, R., O’Neil, J., and Carlson, R., 2013. Hadean to Neoarchaean evolution of the Nuvvuagittuq greenstone belt: new insights from U-Pb zircon geochronology. American Journal of Science, 313, 844–876.CrossRefGoogle Scholar
  4. David, J., Godin, L., Stevenson, R., O’Neil, J., and Francis, D., 2009. U-Pb ages (3.8–2.7 Ga) and Nd isotope data from the newly identified Eoarchean Nuvvuagittuq supracrustal belt, Superior Craton, Canada. Geological Society of America Bulletin, 121, 150–163.Google Scholar
  5. Kinoshita, N., Paul, M., Kashiv, Y., Collon, P., Deibel, C. M., DiGiovine, B., Greene, J. P., Henderson, D. J., Jiang, C. L., Marley, S. T., Nakanishi, T., Pardo, R. C., Rehm, K. E., Robertson, D., Scott, R., Schmitt, C., Tang, X. D., Vondrasek, R., and Yokoyama, A., 2012. Geocosmochronometer 146Sm: a revised half-life value. Prague Goldschmidt conference abstract. Science, 335, pp.1614–1617.Google Scholar
  6. O’Neil, J., Maurice, C., Stevenson, R. K., Larocque, J., Cloquet, C., David, J., and Francis, D., 2007. The geology of the 3.8 Ga Nuvvuagittuk (Porpoise Cove) greenstone belt, northern superior province, Canada. In Kranendonk, M. J., Smithies, R. H., and Bennett, V. C. (eds.), Earth’s Oldest Rocks. Amsterdam: Elsevier BV, pp. 219–250.CrossRefGoogle Scholar
  7. O’Neil, J., Carlson, R. W., Francis, D., and Stevenson, R. K., 2008. Neodymium-142 evidence for Hadean Mafic crust. Science, 321, 1828–1831.CrossRefGoogle Scholar
  8. O’Neil, J., Carlson, R. W., Paquette, J.-L., and Francis, D., 2012. Formation age and metamorphic history of the Nuvvuagittuq greenstone belt. Precambrian Research, 220–221, 23–44.CrossRefGoogle Scholar
  9. O’Neil, J., Francis, D., and Carlson, R. W., 2011. Implications of the Nuvvuagittuq greenstone belt for the formation of Earth’s early crust. Journal of Petrology, 52, 985–1009.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Earth SciencesUniversity of OttawaOttawaCanada