Two tectonically significant enclaves in the Nordre Strømfjord shear zone at Ataneq, central West Greenland

Authors

  • William E. Glassley Geological Institute, University of Aarhus, Høegh-Guldbergsgade 2, DK-8000 Århus C, Denmark
  • John A. Korstgård Geological Institute, University of Aarhus, Høegh-Guldbergsgade 2, DK-8000 Århus C, Denmark
  • Kai Sørensen Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

DOI:

https://doi.org/10.34194/geusb.v13.4974

Abstract

The Nordre Strømfjord shear zone is a 1.8 Ga zone of largescale, transcurrent and sinistral ductile shear (Sørensen et al. 2006) within the Nagssugtoqidian Mobile Belt (NMB) of central West Greenland. It has been hypothesised that the NMB is a suture between two Archaean continental masses (Kalsbeek et al. 1987). During field work in 2005 along the Nordre Strømfjord shear zone in the fjord Ataneq (Fig. 1), some unusual rock types were discovered that preserve evidence of magmatic and metamorphic processes not previously reported in the area. These observations include the first indication of high-pressure (HP) metamorphism in West Greenland and the first reported occurrence of a cumulate of giant orthopyroxene. The tectonic telescoping of these features together within the Nordre Strømfjord shear zone has important implications for reconstructing the Palaeoproterozoic history of this region, and provides evidence that processes typical of Phanerozoic continent–continent collision zones (e.g. the Caledonian and Alpine systems) operated at least as far back as 1.8 Ga ago.

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Published

2007-10-12

How to Cite

Glassley, W. E. ., Korstgård, J. A. ., & Sørensen, K. . (2007). Two tectonically significant enclaves in the Nordre Strømfjord shear zone at Ataneq, central West Greenland. GEUS Bulletin, 13, 49–52. https://doi.org/10.34194/geusb.v13.4974

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Section

RESEARCH ARTICLE | SHORT

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