Analysis of Palaeogene strike-slip tectonics along the southern East Greenland margin (Sødalen area)

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Abstrakt

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.
OriginalsprogEngelsk
Sider (fra-til)65–68
Antal sider4
TidsskriftGeological Survey of Denmark and Greenland Bulletin
Vol/bind23
DOI
StatusUdgivet - 15 jul. 2011

Programområde

  • Programområde 3: Energiressourcer

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