Open AccessGneiss complex of the Skærfjorden region (76°-78°N), North-East Greenland
Author(s) -
Joshua M. Hull,
J.D Friderichsen,
Jane A. Gilotti,
N Henriksen,
A.K Higgins,
Feiko Kalsbeek
Publication year - 1994
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v162.8247
Subject(s) - geology , proterozoic , archean , mafic , gneiss , orogeny , geochemistry , magmatism , nappe , subduction , lithology , ultramafic rock , petrology , paleontology , tectonics , metamorphic rock
The crystalline rocks of the Skærfjorden region are dominated by grey migmatitic orthogneisses with smaller bodies of ultramafic, mafic and metasedimentary lithologies. Archaean rocks (c. 3.0 Ga) have been documented, but crustal additions were predominantly Early Proterozoic (2.0–1.75 Ga) in age, reflecting subduction zone magmatism. FolIowing Early Proterozoic orogenesis and migmatisation, granitic sheets (c. 1.7 Ga) and dolerite dykes were intruded. These intrusive rocks were subsequently deformed and metamorphosed in the Caledonian orogeny (c. 400 Ma). The Skærfjorden region is located in the Caledonian hinterland, where orogen parallel stretching and extension followed an early nappe stage.