Pre-Caledonian metamorphic complexes within the southern part of the East Greenland Caledonides

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Abstract
Isotopic dating and recent regional mapping have led to reappraisal of conventional interpretations of the southern part of the East Greenland Caledonides. The metamorphic complexes of the Scoresby Sund region preserve evidence of Archaean and Proterozoic orogenic episodes, and high grade metasedimentary sequences thought to be late Pre-cambrian Caledonian geosynclinal rocks have yielded middle Proterozoic isotopic ages. The intensity of the Caledonian orogeny is much less than formerly imagined. The interpretations of the Scoresby Sund region are extended northwards into the classic areas of the central metamorphic complex where the widely accepted concept of a deep-seated Caledonian orogeny was developed. A similar development to that of the Scoresby Sund region seems probable, though statements should be treated with reservation until new field work and isotopic studies have been completed. Brief mention is made of parallel developments in the Cale-donian fold belts of northern Europe.