Abstract
Late Archaean and Early Proterozoic crust-forming events in North-East and eastern North Greenland were succeeded by Middle Proterozoic sedimentation and volcanic activity; Late Proterozoic through Tertiary sedimentation was interrupted by several periods of tectonic activity, including the Caledonian orogeny in East Greenland and the Mesozoic deformation of the Wandel Hav mobile belt. Photogeological studies helped pinpoint areas of special interest which were investigated during the short 1993 field season. Insights gained during field work include: the nature of the crystalline basement terrain in the Caledonian fold belt, redefinition of the upper boundary of the Upper Proterozoic Rivieradal sandstones, revision of Caledonian nappe terminology, and the northern extension of the Caledonian Storstrømmen shear zone.
Highlights
Late Archaean and Early Proterozoic crust-forming events in North-East and eastern North Greenland were succeeded by Middle Proterozoic sedimentation and volcanic activity; Late Proterozoic through Tertiary sedimentation was interrupted by several periods of tectonic activity, including the Caledonian orogeny in East Greenland and the Mesozoic deformation of the Wandel Hav mobile belt
Reconnaissance field work carried out in 1993 in North-Bast and eastem North Greenland marked the initial stage of a new 1:500 000 mapping project aimed at investigation of the region between JOkelbugten (78°N) and northem Kronprins Christian Land (8l 0 N) (Fig. 1)
The marginal areas to the east and north have been the sites of repeated cycles of orogenic activity and sedimentation; these include accretion of Early Proterozoic crnst, Middle Proterozoic sedimentation and vo1canism, Late Proterozoic - Lower Palaeozoic sedimentation and Palaeozoic orogenesis (Ellesmerian orogeny in North Greenland, Caledonian orogeny in East Greenland), Late Palaeozoic Tertiary sedimentation, and Mesozoie to Early Tertiary strike-slip deformation (Figs 1, 2)
Summary
North-East and eastem North Greenland are located at the north-east comer of the Canada-Greenland Precambrian shield, and the geological evolution of the region since the Early Proterozoic refleets this location. The shield area has acted as a stable basement since the Middle Proterozoic, upon which continental and marine shelf sediments and vo1canic rocks were deposited. The marginal areas to the east and north have been the sites of repeated cycles of orogenic activity and sedimentation; these include accretion of Early Proterozoic crnst, Middle Proterozoic sedimentation and vo1canism, Late Proterozoic - Lower Palaeozoic sedimentation and Palaeozoic orogenesis (Ellesmerian orogeny in North Greenland, Caledonian orogeny in East Greenland), Late Palaeozoic Tertiary sedimentation, and Mesozoie to Early Tertiary strike-slip deformation (Figs 1, 2). In central Lambert Land they are in thrnst eontact against Independence Fjord Group sandstones. They represent the northward extension of the
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