Abstract
Results are presented of regional geological reconnaissance and local detailed studies. The new fjeld work, together with isotopic studies, has made possibie a provisional reassignment of metamorphic, plutonic and deformational events recorded in the different rock units to Archaean and Proterozoic, as well as Caledonian, orogenic episodes. The infracrustal elements of the 'central metamorphic complex' are considered to be essentiaIly Archaean - early Proterozoic basement gneiss complexes, and are overlain by middle Proterozoic metasedimentary sequences. The late Proterozoic and Lower Palaeozoic sediments have arestricted outcrop at present levels of exposure. During the Caledonian orogeny the late Proterozoic cover sequences appear to have become detatched from their older metamorphic 'basernent' along a decollement surface, but the nature of this contact is usually obscured by Caledonian metamorphic effects. The main characteristics of the different rock units are described. Detailed relationships are illustrated by studies of four areas: Nunatakgletscher-Eremitdal, Knækdalen and adjacent areas, Kap Hediund, and Tærskeldal-Forsblads Fjord-Randenæs.
Highlights
In the summers of 1975 to 1978 the writers undertook geological reconnaissance studies mainly within the metamorphic complexes of the East Greenland Caledonian fold belt between latitudes nO-74°N. This was a natural extension of the regional mapping by the Survey in the Scoresby Sund region (70°-nON) which, apart from production of a series of 1: 100 000 map sheets, had led to significant modification of the c1assic interpretation of the East Greenland Caledonides (Haller, 1971)
Since 1:250000 geological maps of the region nO-76°N were already in existence (Koch & Haller, 1971), as well as many areal descriptions, the new investigations were aimed at specific problems, the main geological results being the subject of this report; preliminary results have been given by Friderichsen & Higgins (1976), Higgins et al (1977) and Higgins & Friderichsen (1979)
The investigations reported on here represent the conc1usions of a preliminary stage of reinvestigation of the metamorphic complexes between 72°-74°N
Summary
In the summers of 1975 to 1978 the writers undertook geological reconnaissance studies mainly within the metamorphic complexes of the East Greenland Caledonian fold belt between latitudes nO-74°N. This was a natural extension of the regional mapping by the Survey in the Scoresby Sund region (70°-nON) which, apart from production of a series of 1: 100 000 map sheets, had led to significant modification of the c1assic interpretation of the East Greenland Caledonides (Haller, 1971).
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