Encyclopedia of Scientific Dating Methods

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

Acasta Gneiss Complex

  • Samuel Bowring
  • Tom Chacko
  • Larry Heaman
  • Jesse Reimink
Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_91-1

Synonyms

Definition

The Acasta gneiss complex in northwestern Canada contains some of the oldest dated rocks on earth and the oldest dated using U-Pb in zircon. They therefore potentially preserve clues to the nature and history of earth’s oldest crust. The geology of the gneisses reflects a complex multistage history of magmatism, metamorphism, and deformation over more than 400 million years, and the entire complex should be viewed as a small fragment of Hadean to Archean continental crust. The gneisses are compositionally diverse and range from granite and tonalite to gabbro and serpentinized ultramafic rocks. The oldest published crystallization age. There are isotopic and inherited zircon data consistent with the involvement of crust as old as 4.2 Ga. There is no single age of the Acasta gneiss complex (Bowring and Williams 1999).

Introduction

Components of the Acasta gneiss complex are among the oldest known rocks on earth. They are exposed in northwestern Canada...

Keywords

Continental Crust Detrital Zircon Archean Rock Late Heavy Bombardment Granitic Dike 
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

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Samuel Bowring
    • 1
  • Tom Chacko
    • 2
  • Larry Heaman
    • 2
  • Jesse Reimink
    • 2
  1. 1.Department of Earth, Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Department of Earth and Atmospheric SciencesUniversity of AlbertaEdmontonCanada