Review of isotope data for Precambrian rocks from the Disko Bugt region, West Greenland

Authors

  • Feiko Kalsbeek Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark
  • Paul N. Taylor Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, UK

DOI:

https://doi.org/10.34194/ggub.v181.5110

Keywords:

Archaean, Disko Bugt, Pb-Pb ages, Proterozoic, Rb-Sr ages, Sm-Nd ages, West Greenland

Abstract

Pb-Pb and Rb-Sr isotope data yield whole-rock isochron ages of c. 2800 Ma for two localities of granitoid rocks in the Disko Bugt region, with little evidence of strong later disturbance. Rb-Sr isotope data on Archaean metasediments from two localities, however, were strongly disturbed during the early Proterozoic. Sm-Nd whole-rock data for acid metavolcanic rocks within Archaean supracrustal sequences yield model ages of c. 2800 Ma. The early Proterozoic age of a younger sequence of supracrustal rocks (the Anap nunâ Group) is confirmed by Sm-Nd data, and Rb-Sr whole-rock data for albitised siltstones show that albitisation took place hundreds of millions of years after the peak of early Proterozoic orogenic activity.

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

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Published

1999-07-22

How to Cite

Kalsbeek, F. ., & Taylor, P. N. . (1999). Review of isotope data for Precambrian rocks from the Disko Bugt region, West Greenland. Geology of Greenland Survey Bulletin, 181, 41–47. https://doi.org/10.34194/ggub.v181.5110

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.