Abstract
This note documents results of routine K/Ar isotopic age determination of dolerite dykes from the North Greenland fold belt. All the material was collected in 1969 by two of us (P.R.D. and N.J.S.) during the Joint Services Expedition to Peary Land; the isotopic analyses have been undertaken by D.C.R. in the geologicallaboratories of the University of Leeds. In view of the renewed interest in the tectonic and magmatic history of the Peary Land region stemming from the systematic field studies carried out by GGU in 1978-1980 (see GGU Rapport 88, 99 and 106), the results of this early dating programme are listed here as a contribution to this discussion. Recently, some reference has been made in the literature to these hitherto unpublished results (Dawes & Soper, 1979; Higgins et al., 1981; Håkansson & Pedersen, 1982).
Highlights
This note documents results of routine K/Ar isotopic age determination of dolerite dykes from the North Greenland fold belt
The North Greenland fold belt is traversed by dolerite dykes of various trends, and some dykes are present to the south of the fold belt cutting the Proterozoic to Silurian platform strata
In the northern coastal area, show the effect of important post-intrusion deformation attributed to late Phanerozoic (Cretaceous-Tertiary) regional reactivation (Dawes & Soper, 1979; Higgins et al, 1981)
Summary
The North Greenland fold belt is traversed by dolerite dykes of various trends, and some dykes are present to the south of the fold belt cutting the Proterozoic to Silurian platform strata. In the fold belt the dykes cut the folded Lower Palaeozoic strata that were deformed and metamorphosed in mid-Palaeozoic time. In the northern coastal area, show the effect of important post-intrusion deformation attributed to late Phanerozoic (Cretaceous-Tertiary) regional reactivation (Dawes & Soper, 1979; Higgins et al, 1981). The only hitherto published isotopic age dates on Phanerozoic basic dykes from North Greenland are a K/Ar age of 66 Ma on an E-W trending dyke from the southem margin of the fold belt (Dawes & Soper, 1971), and a K/Ar age ofn Ma on a NW-trending dyke from the platform (Henriksen & Jepsen, 1970). All the results obtained during the routine study are listed, irrespective of the degree of geological significance each might imply
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