Abstract
This paper describes structural data collected during field work in southern East Greenland, a region characterised by a complex tectonic history. Here, 3D photogeology based on aerial and oblique photographs using high-resolution photogrammetry of a 150 km2 area in Sødalen in southern East Greenland shows ESE–WNW-trending faults cross-cutting Paleocene rift structures and flexure-related normal faults. The kinematic analysis highlights oblique and left-lateral strike-slip movements along faults oriented 120°. Strike-slip and dip-slip kinematic indicators on the walls of the chilled contacts between alkaline E–W-oriented dykes and the volcanic host rocks suggest that the faults and dykes formed at the same time, or maybe the faults were re-activated at a later stage. Palaeostress analysis, performed by inversion of fault-slip data, shows the presence of three different tectonic events. Coupling the 3D photogeological tool with structural analysis at key localities is a fundamental way to understand better the tectonic history of such a large area.
Highlights
This paper describes structural data collected during field work in southern East Greenland, a region characterised by a complex tectonic history
The geological evolution of the margin is interpreted as the result of a NE–SW-oriented Late Cretaceous rifting phase that led to the onset of oceanic spreading in the Late Paleocene – Early Eocene (c. 55 Ma) after a period of syn-rift continental tectonism and volcanism
The trend of the dykes, coupled with evidence of multiple reactivation of the contact, suggests a relationship between strike-slip faults and dykes in which normal faults intruded by dykes were re-activated as leftlateral faults in a NNE–SSW extensional regime associated with the ESE–WNW-trending shear-zone (Fig. 2A)
Summary
This paper describes structural data collected during field work in southern East Greenland, a region characterised by a complex tectonic history. 3D photogeology based on aerial and oblique photographs using high-resolution photogrammetry of a 150 km area in Sødalen in southern East Greenland shows ESE–WNW-trending faults cross-cutting Paleocene rift structures and flexure-related normal faults. The kinematic analysis highlights oblique and left-lateral strike-slip movements along faults oriented 120°. Strike-slip and dip-slip kinematic indicators on the walls of the chilled contacts between alkaline E–W-oriented dykes and the volcanic host rocks suggest that the faults and dykes formed at the same time, or maybe the faults were re-activated at a later stage. Palaeostress analysis, performed by inversion of fault-slip data, shows the presence of three different tectonic events. Coupling the 3D photogeological tool with structural analysis at key localities is a fundamental way to understand better the tectonic history of such a large area
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