Devonian dike swarms of alkaline, carbonatitic and primitive magmatype rocks the south Kola Peninsula: geochemical and isotopic constraints on plumelithospheric interaction

• Main Authors: Mahotkin, I., Downes, Hilary, Hegner, E., Beard, Andrew
• Format: Conference Object
• Language: unknown
• Published: 2003
• Subjects: Earth and Planetary Sciences; Kandalaksha; Kola Peninsula; Niva; Onega; Terskiy Bereg; Zimniy Bereg; Arkhangelsk; Kandalaksha Gulf; kola peninsula
• Online Access: https://eprints.bbk.ac.uk/id/eprint/27773/; http://ikcabstracts.com/index.php/ikc/article/view/3221/3221

Geochemistry and Sr-Nd-Pb isotopic compositions of two dike swarms within the Devonian magmatic area of the south Kola peninsula (NW Russia) have been studied. One swarm is located in the north-west part of the Kandalaksha gulf (Niva, Kandaguba areas) and the other occurs further east on Turiy Cape. The Niva-Kandaguba dike swarm also includes numerous dikes on islands in the Kandalaksha gulf and a kimberlite dike exposed on Krestovaya mountain (Beard et al., 1996; Beard et al., 1998). Both swarms of Devonian dikes are situated within the Belomorian Belt of Late Archaean crust which experienced Early Proterozoic extension at 2.4-2.5 B.a. and collision process at 1.9-2.0 B.a. (Bibikova et al., 1996; Balagansky et al., 1998). To the south-east along the suture zone between the Belomorian Belt and the Kola craton, several fields of Devonian melnoites and diamondiferous kimberlites occur in the Terskiy Bereg area of the Kola Peninsula, in the Onega peninsula and Zimniy Bereg area of the Arkhangelsk region (Kalinkin et al., 1993, Mahotkin, etal. 1997; Mahotkin et al., 2000; Beard et al., 2000).