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Palaeomagnetic and RbSr isotopic evidence for the age of the Särna alkaline complex,western central Sweden
Authors:G Bylund  PJ Patchett
Institution:1. Department of Mineralogy and Petrology, Sölvegatan 13, S-223 62 Lund, Sweden;2. Scottish Universities Research and Reactor Centre, East Kilbride, Glasglow G75 OQU, Scotland
Abstract:The stable palaeomagnetic pole of peralkaline syenites from the Särna intrusion lies close to the mean Upper Carboniferous pole for stable Europe and to other poles of similar age from the Baltic Shield. This age evidence is in agreement with an Rb-Sr 8-point mineral isochron for a single whole-rock sample of 287±14 m.y. (2σ). The isochron age and the pole position are believed to reflect the emplacement and cooling of the body and a comparison is drawn with other events of similar age in the Baltic Shield. Variation of initial 87Sr/86Sr ratios of whole-rock samples from 0.7041 to 0.7070 (at 287 m.y.) is considered to be caused by contamination of an ultimately mantle-derived magma by radiogenic strontium from crustal material.
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