The Vetreny Poyas (Windy Belt) subprovince of southeastern Fennoscandia: An essential component of the ca. 2.5-2.4Â Ga Sumian large igneous provinces

Negative or near-zero ɛNd values for intrusive rocks from the Ruiga massif (−2.0 ± 0.8) and volcanics from Golets Hill (−0.4 ± 0.9) suggest that the mantle source for their melts was enriched or that their parental magmas were contaminated by crustal rocks during intrusion and crystallization. Overall, the petrologic-geochemical study of rocks from the above-mentioned complexes indicates that they were all derived from the same parental primary komatiitic melt (associated with a mantle plume) that experienced crustal contamination. This parental magma for the province is a komatiitic basalt magma type with key petrochemical parameters (9-18% MgO, 0.5-1.0% TiO2, SiO2 <53%), and is contrasted with other high-Mg magmatic types, boninites, komatiites, picrites and meimechites.