A Review of the Geodynamic Significance of Hornblende-Bearing Ultramafic Rocks in the Mesoarchean Fiskenæsset Complex, SW Greenland

  • Ali Polat
Part of the Modern Approaches in Solid Earth Sciences book series (MASE, volume 7)


The Fiskenæsset Complex, SW Greenland, is characterized by layered anorthosite, leucogabbro, gabbro, and ultramafic rock association. Ultramafic rocks consist mainly of hornblendite, hornblende peridotite, hornblende pyroxenite, and dunite. Despite upper amphibolite to granulite facies metamorphism, poly-phase deformation and multiple granitoid intrusions, primary igneous layers and mineral assemblages have been well preserved. Petrographic studies, including SEM-BSE imaging, reveal the presence of igneous hornblende occurring as an interstitial mineral to olivine, clinopyroxene, orthopyroxene, plagioclase, and chromite, as well as inclusions in these minerals, consistent with a hydrous mantle source. Large negative Nb-anomalies in whole-rock samples and hornblende grains suggest that the magmas of the Fiskenæsset Complex originated from a hydrous sub-arc mantle peridotite. Water was recycled to the source of the Fiskenæsset rocks through subduction of hydrated oceanic crust. Phanerozoic hornblende-bearing mafic and ultramafic rocks are typically associated with supra-subduction zone ophiolites and magmatic arcs. Recycling of water to the upper mantle via subduction of oceanic crust not only resulted in the generation of hornblende-rich rocks, but also played an important role in the formation of TTG-dominated Archean continental crust.


Subduction Zone Oceanic Crust Mantle Source Ultramafic Rock Igneous Origin 
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.



Dr. Y. Dilek is acknowledged for the invitation of this paper. The research was supported by NSERC grants and the fieldwork by the Bureau of Minerals and Petroleum in Nuuk and the Geological Survey of Denmark and Greenland (GEUS).


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© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Earth and Environmental SciencesUniversity of WindsorWindsorCanada

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