Abstract
Most crystalIine rocks of northern East Greenland have until recently been regarded as representing the deep-seated mobile core zone of the Caledonian orogenic belt (Haller, 1971). However, recent regional mapping and isotopic studies in the Scoresby Sund region indicate that the main development of the crystalline complexes relate to Archaean and Proterozoic orogenesis, with a relatively superficial Caledonian overprint (Henriksen & Higgins, 1976). It was a logical step to extend field studies northwards to the crystalIinerocks ofthe region between 72-74°N (fig. 32). These studies supplement isotopic work in progress on material from the crystaIline complexes collected by D. C. Rex (Leeds) in 1974 (Rex et· al., this report), as well as the research being carried out on various aspects ofthe Eleonore Bay Group by R. Caby (MontpeIIier) this report and H. Stendal (Copenhagen).
Highlights
The expedition to central and northern East Greenland in 1975 had 29 participants
The base camp for all operations was at Stordal situated in Muskusoksefjord, west of Hold with Hope
Copenhagen via Iceland, to Mesters Vig from where the 200 km journey to Stordal was carriedout by a Beechcraft chartered from Flugfelag Norourlands, Iceland
Summary
The expedition to central and northern East Greenland in 1975 had 29 participants Ten of these took part in the programme for uranium prospecting (Steenfelt, and Secher et al, this report) and 5 field teams studied the following subjects: the sedimentology of continental. Most crystalIine rocks of northern East Greenland have until recently been regarded as representing the deep-seated mobile core zone of the Caledonian orogenic belt (Haller, ]971). Recent regional mapping and isotopic studies in the Scoresby Sund region indicate that the main development ofthe crystalline complexes relate to Archaean and Proterozoic orogenesis, with a relatively superficial Caledonian overprint The metasedimentary sequences surrounding the infracrustal units were extensively sampled' with a view to establishing a regional metamoq,hic zonation, and for comparisons with early Proterozoic sedimentary sequences ofthe Scoresby Sund region; all sedimentary rocks have previously been assumed to represent metamoqihosed equivalents of the Lower Eleonore Bay Group. Ground observations were made in the vicinity ofNordenskiold Gletscher, western Louise Boyd Land and Arnold Escher Land, areas normally difficult of access and rarely visited
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