Open AccessRegional Caledonian structure of Hertugen af Orléans Land, North-East Greenland
Author(s) -
R. A. Strachan,
H.F Jepsen,
Feiko Kalsbeek
Publication year - 1991
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v152.8162
Subject(s) - geology , sinistral and dextral , shear zone , mylonite , gneiss , proterozoic , basement , seismology , shear (geology) , geomorphology , paleontology , fault (geology) , tectonics , metamorphic rock , archaeology , geography
Three structural elements of the East Greenland Caledonides are present in Hertugen af Orleans Land: (1) a marginal NNE-SSW trending zone of crystalIine basement rocks overlain by middle Proterozoic sediments (Trekant Series) in the westernmost nunatak area, characterised by folds and thrusts; (2) a central NNE–SSW trending belt of alIochthonous orthogneisses dominated by upright and west-vergent folds; and (3) and eastern N–S trending sinistral shear zone of intensely sheared, mylonitic gneisses (Storstrømmen shear zone). This structural pattern is a continuation of the structural elements in Dronning Louise Land, 40 km to the south-south-east. The late Caledonian Storstrømmen shear zone and its northward continuation define a 10 km wide linear feature of regional significance which can be followed along strike for more than 300 km.