Evolution of pyroxene in peralkaline magmatic system: An example of an agpaitic syenite dyke complex and the Niva intrusion, Kola Peninsula
The paper presents pioneering data on the composition of pyroxenes and the distribution of trace elements in this mineral in small geological bodies that were formed by single magma injections and their subsequent rapid crystallization: the Niva intrusion and an agpaitic syenite dyke. The pyroxene is highly alkaline and shows continuous compositional trends with an increase in the aegirine concentration. The Ti concentrations of the pyroxene are much higher than in pyroxenes in agpaitic syenites in other alkaline complexes. In spite of the fact that the pyroxene is hosted in small bodies, the evolution of these pyroxenes was similar to that of pyroxenes in the Lovozero and Khibina alkaline massifs.
Keywordsalkaline magmatism evolution of alkaline pyroxenes Kola Alkaline Province
Unable to display preview. Download preview PDF.
- A. A. Arzamastsev, F. Bea, V. N. Glaznev, L. Arzamastseva, and P. Montero, “Paleozoic Kola alkaline province: composition of primary mantle magmas and conditions of magma formation,” Ross. Zh. Nauk Zemle 3 (1), 1–32 (2001).Google Scholar
- D. S. Korzhinskii, “Acid–base interaction of components in silicate melts and direction of cotectic lines,” Dokl. Akad. Nauk SSSR 128 (2), 383–386 (1959).Google Scholar
- V. N. Yakovenchuk, G. Yu. Ivanyuk, Ya. A. Pakhomovskii, Yu. P. Men’shikov, N. G. Konopleva, and Yu. A. Korchak, “Pyroxenes of the Khibiny alkaline massif (Kola Peninsula, Russia), Zap. Ross. Mineral O-va 2, 96–113 (2008).Google Scholar