Continental Collision Structures and Post-Orogenic Geological History of the Kangerlussuaq Area in the Southern Part of the Nagssugtoqidian Orogen, Central West Greenland

Abstract

Deep-seated continental collision sutures, formed at a depth of more than 20 km, are exposed near Kangerlussuaq, close to the Greenland ice cap, on the southern margin of the Nagssugtoqidian orogen in Central West Greenland, thus offering a rare opportunity to study the tectonic deformation style of such an orogen. This paper adds new information on the tectonic history of the southern flank of the Nagssugtoqidian orogen. It focuses on (1) the results of a detailed structural investigation of lineament zones revealed from remote sensing of geophysical and topographic data and aerial photo interpretation, (2) detailed geological mapping at key locations and (3) a tectonic structural model describing the geological development of the area. The area has undergone several episodes of deformation, which have been compiled into an event succession that recognizes eight tectonic events overprinting each other: Two stages of folding (F1 and F2) have been identified along with one major episode of intrusion of the Kangâmiut mafic dyke swarm (2.05 Ga) into the Archaean continent. These dyke intrusions are very important, since by examining the style of deformation for these intrusions it is possible to define the transition from the North Atlantic Craton in the south to the mobile belts in the Nagssugtoqidian orogen in the north. Five different types of pronounced lineaments and one less pronounced lineament postdating the Kangâmiut dykes extending from ductile deformation shearing events to brittle deformation with extensive faulting. These lineaments cover both the collisional and post-collisional

Mg and Li Stable Isotope Ratios of Rocks, Minerals, and Water in an Outlet Glacier of the Greenland Ice Sheet

“…The orthogneisses were intruded by the 2.04 Ga Kangâmiut mafic dyke swarm (Cadman et al, 2001), now forming amphibolite lenses, with deformation increasing toward the north (Van Gool et al, 2002;Engström and Klint, 2014). To the south of Leverett is the North Atlantic Craton, composed of granulite-facies granodioritic augen orthogneiss and paragneiss locally (Escher et al, 1976;Henriksen et al, 2000).…”

A landscape-isotopic approach to the geochemical characterization of lakes in the Kangerlussuaq region, west Greenland

“…The geology of the study area consists of Archean gneisses reworked in the Paleoproterozoic with an eastnotheast structural trend. The area is structurally complex, having gone through several episodes of deformation (Engström and Klint 2014), with lakes often occurring along structural lineaments and within closed basins. The dominant rock type is quartzo-feldspathic gneiss that is quartz rich and commonly biotite bearing.…”

Integration of Vessel-Based Hyperspectral Scanning and 3D-Photogrammetry for Mobile Mapping of Steep Coastal Cliffs in the Arctic

“…The rapidity of HSI acquisition on a vessel allows one to provide valuable information that delivers not only lithological constraints but also structural control. Engström and Klint [55] presented the results of a detailed structural investigation of lineament zones as revealed from remote sensing of geophysical and topographic data and aerial photo interpretation, together with detailed geological mapping at key locations. They proposed that the area has undergone several episodes of deformation.…”