SHRIMP U-Pb zircon ages for Archaean granitoid rocks, Ataa area, north-east Disko Bugt, West Greenland

Authors

  • Allen P. Nutman Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia
  • Feiko Kalsbeek Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark

DOI:

https://doi.org/10.34194/ggub.v181.5111

Keywords:

Archaean rocks, Disko Bugt, SHRIMP, U-Pb ages, zircon ages, West Greenland

Abstract

Zircons from four samples of granitoid rocks from the Ataa area have been studied by SHRIMP ion microprobe. A trondhjemite from the Atâ intrusive complex (Atâ tonalite) yielded an age of 2803 ± 4 Ma, in agreement with earlier age determinations. A sample from the regional migmatitic biotite gneisses gave 2815 ± 4 Ma. A homogeneous granitoid rock, from field observations believed to be younger than the regional gneisses, has two main zircon populations, 2835 ± 4 Ma and c. 2800 Ma, respectively, and a granite that intrudes the Atâ complex yielded an age of 2758 ± 2 Ma.

Geological sketch map of the Ataa area north-east of Disko Bugt.

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Published

1999-07-22

How to Cite

Nutman, A. P. ., & Kalsbeek, F. . (1999). SHRIMP U-Pb zircon ages for Archaean granitoid rocks, Ataa area, north-east Disko Bugt, West Greenland. Geology of Greenland Survey Bulletin, 181, 49–54. https://doi.org/10.34194/ggub.v181.5111

Issue

Vol. 181 (1999): Precambrian geology of the Disko Bugt region, West Greenland

Section

RESEARCH ARTICLE

License

This article is distributed under a CC-BY 4.0 licence, permitting free redistribution and reproduction for any purpose, even commercial, provided proper citation of the original work. Author(s) retain copyright over the article contents.