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Metasomatism in the mantle xenoliths from Gees, West Eifel, Germany, occurs by silicate melts and the carbonatite metasomatism is almost absent. The silicate glass is present in almost all stages of transformations during metasomatism. The remnants of the upper mantle hybrid melts generate the Si-Al-enriched glasses of the xenoliths metasomatized by silicate melts. Ca-enrichment of the xenoliths may be due to low activities of silica.