Abstract
Five new U-Pb age determinations on zireons and three new or reanalysed Rb-Sr age determinations of some of the late orogenie plutonic bodies from the Gåseland - Stauning Alper migmatite and granite zone in the Scoresby Sund region, give Caledonian ages between 428 Ma and 352 Ma. Together with previously published age determinations they suggest a main intrusive epoeh around 420 Ma with the last intrusive events as late as 390 - 350 Ma. In addition analytical data for six previously published Rb-Sr ages from the region are reassessed and presented in full.
Highlights
Five new U-Pb age determinations on zireons and three new or reanalysed Rb-Sr age determinations of some of the late orogenie plutonic bodies from the Gåseland Stauning Alper migmatite and granite zone in the Seoresby Sund region, give Caledonian ages between 428 Ma and 352 Ma
A thick sequence of upper Proterozoic to Ordovician sediments deposited on this older basement was subsequently involved, together with the basement in the Caledonian orogeny
Caledonian migmatisation and plutonism were widespread and a variety of late orogenic plutonic rocks were emplaced. Some of these plutons were intruded into the pre-Caledonian basement complexes, but many occur in the border zone between the infracrustal basement complexes and belts of upper Proterozoic - Ordovician sediments (Higgins & Phillips, 1979; Henriksen, 1984)
Summary
The location of the analysed samples is indicated in fig. Samples marked with two asterisks were analysed in Miinster according to the methods of Persson et al (1983) for the U-Pb analyses and Persson & Hansen (1982) for the Rb-Sr analyses. All ages quoted in this paper have been recalculated using the constants recommended by the IUGS Subcommission (Steiger & lliger, 1977). Regression lines were calculated according to the least squares method of York (1969). Errors quoted in this paper are 2a of the means
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