Abstract
This paper reports the results of the first study of pyroxenes from the deepest zones of the Lovozero deposit. The geochemical and mineralogical study of these rocks is of great scientific interest, as they are the least differentiated rocks and provide insight into the composition of a parental magma. According to microprobe analysis, clinopyroxenes evolve from early diopside–hedenbergite–augite to later alkaline aegirine–augite species. Upsection, the contents of Na, Fe3+ and Ti increase, while Mg, Ca, Fe2+, and Zr decrease. Thus, isomorphic substitution in pyroxenes of the lower zone follows the scheme (Ca, Mg, Fe2+, Zr) → (Na, Fe3+, Ti).
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REFERENCES
A. A. Arzamastsev, L. V. Arzamastseva, V. N. Glaznev, and A. B. Raevskii, “Petrologic–geophysical model for the structure and composition of deep levels of the Khibina and Lovozero complexes, Kola Peninsula,” J. Petrol. 6 (5), 434–450 (1998).
A. K. Ferguson, “The natural occurrence of aegirine–neptunite solid solution,” Contrib. Mineral. Petrol. 60, 247–253 (1977).
V. I. Gerasimovskii, V. P. Volkov, L. N. Kogarko, A. I. Polyakov, T. Yu. Saprykina, and Yu. A. Balashov, Geochemistry of the Lovozero Massif (Nauka, Moscow, 1966) [in Russian].
A. P. Jones and A. Peckett, “Zirconium–bearing aegirines from Motzfeldt, south Greenland,” Contrib. Mineral. Petrol. 75, 251–255 (1981).
L. N. Kogarko, Problems of Genesis of Agpaitic Magmas (Nauka, Moscow, 1977) [in Russian].
L. N. Kogarko, V. A. Kononova, M. P. Orlova and A. R. Woolley, Alkaline Rocks and Carbonatites of the World. Part 2. Former USSR (Chapman & Hall, London, 1995).
L. N. Kogarko, C. T. Williams, and A. R. Woolley, “Chemical evolution and petrogenetic implication of loparite in the layered agpaitic Lovozero complex, Kola peninsula, Russia,” Mineral. Petrol. 74, 1–24 (2002).
L. N. Kogarko, C. T. Williams, and A. R. Woolley, “Compositional evolution and cryptic variation in pyroxenes of the peralkaline Lovozero intrusion, Kola Peninsula, Russia,” Mineral. Mag. 70 (4), 347–359 (2006).
L. M. Larsen, “Clinopyroxenes and coexisting mafic minerals from the alkaline Ilimaussaq intrusion, South Greenland,” J. Petrol. 17, 258–290 (1976).
E. Njonfang and C. Moreau “The mafic mineralogy of the Pande Massif, Tikar Plain, Cameroon,” Mineral. Mag. 64, 525–537 (2000).
I. V. Pekov, Lovozero Massif: History of Study, Pegmatites, and Minerals (Tv, Ob’ed. Zemlya Ass. Ekost, 2001) [in Russian].
D. Stephenson, “Alkali clinopyroxenes from nepheline syenites of the South Qoroq Centre, South Greenland,” Lithos 5, 187–201 (1972).
Funding
This work was supported by a grant from the Ministry of Science and Education of the Russian Federation (no. 13.1902.21.0018).
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Translated by M. Bogina
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Shubin, I.I., Filina, M.I. & Kogarko, L.N. Evolution of Pyroxenes of the Lovozero Rare Metal Deposit (Lower Zone). Geochem. Int. 59, 92–98 (2021). https://doi.org/10.1134/S0016702921010092
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DOI: https://doi.org/10.1134/S0016702921010092