Abstract
SmNd data are presented for basic rocks and metagreywackes from the early Proterozoic Bothnian basin in central Sweden. The basic rocks include synsedimentary metabasalts, early orogenic intrusions, and anorogenic dolerites, covering the age range 1.9-1.2 Ga. The samples thus span the entire period from the early part of the Svecokarelian thermo-tectonic episode to the time when this region of the Baltic Shield had been a stable craton for about 0.4 Ga. All these samples have slightly positive ϵ Nd-values, up to +2 for synorogenic rocks and up to +3.5 for anorogenic dolerites. If these values are representative for the contemporaneous mantle, they suggest a less depleted character for this mantle than that shown for several other Proterozoic shield areas. Three metagreywacke samples have ϵ Nd-values of −2.4 to −3.1 indicating a significant influx of detrital older crustal material into the Bothnian basin.
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