The Nordre Strømfjord shear zone and the Arfersiorfik quartz diorite in Arfersiorfik, the Nagssugtoqidian orogen, West Greenland

The Nordre Strømfjord shear zone in the fjord Arfersiorfik, central West Greenland, consists of alternating panels of supracrustal rocks and orthogneisses which together form a vertical zone up to 7 km wide with sinistral transcurrent, ductile deformation, which occurred under middle amphibolite fac...

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Bibliographic Details
Published in:Geological Survey of Denmark and Greenland (GEUS) Bulletin
Main Authors: Sørensen, Kai, Korstgård, John A., Glassley, William E., Møller Stensgaard, Bo
Format: Article in Journal/Newspaper
Language:English
Published: Geological Survey of Denmark and Greenland (GEUS) 2006
Subjects:
aeromagnetic data
Arfersiorfik quartz diorite
deformation
geochemistry
Nagssugtoqidian
Nordre Strømfjord shear zone
West Greenland
Greenland
Nordre Strømfjord
Arfersiorfik
Nordre strømfjord
Online Access:https://geusbulletin.org/index.php/geusb/article/view/4922
https://doi.org/10.34194/geusb.v11.4922
Description
Summary:The Nordre Strømfjord shear zone in the fjord Arfersiorfik, central West Greenland, consists of alternating panels of supracrustal rocks and orthogneisses which together form a vertical zone up to 7 km wide with sinistral transcurrent, ductile deformation, which occurred under middle amphibolite facies conditions. The pelitic and metavolcanic schists and paragneisses are all highly deformed, while the orthogneisses appear more variably deformed, with increasing deformation evident towards the supracrustal units. The c. 1.92 Ga Arfersiorfik quartz diorite is traceable for a distance of at least 35 km from the Inland Ice towards the west-south-west. Towards its northern contact with an intensely deformed schist unit it shows a similar pattern of increasing strain, which is accompanied by chemical and mineralogical changes. The metasomatic changes associated with the shear zone deformation are superimposed on a wide range of original chemical compositions, which reflect magmatic olivine and/or pyroxene as well as hornblende fractionation trends. The chemistry of the Arfersiorfik quartz diorite suite as a whole is comparable to that of Phanerozoic plutonic and volcanic rocks of calc-alkaline affinity.

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