Clinopyroxene from eudialyte lujavrites complex of the Lovozero alkaline massif (Kola Peninsula): Сharacteristics of the chemical composition and evolution

Authors

  • Анна Михайловна Седова St Petersburg State University, 7–9, Universitetskaya nab., St. Petersburg, 199034, Russian Federation
  • Михаил Дмитриевич Евдокимов St Petersburg State University, 7–9, Universitetskaya nab., St. Petersburg, 199034, Russian Federation

DOI:

https://doi.org/10.21638/11701/spbu07.2018.105

Abstract

The Lovozero alkaline massif is the largest known alkaline layered intrusion (Semenov E. V. et al., 1974). For the first time this paper examines the evolution compositions of clinopyroxenes from the third intrusive phase introduced into the main magmatic stage (the complex of eudialyte Lujavrites). A gap has been filled in for a detailed study of pyroxene, as the main melanocratic rock-forming mineral of the massif. Petrographic features of clinopyroxenes in various associations among the main rocks of the complex (eudialyte lujavrites, foyaites and porphyry lujavrites) have been studied. The first approach that takes into account the variational diversity of zonal crystals of clinopyroxenes and their morphology. Zonality and morphology of crystals were studied in detail. The possible presence of Zr-johansenite and Ti—Zr-aegirine minals is shown. The general and particular trends in the evolution of the chemical composition corresponding to zonality are outlined. It was established that there is no direct connection between the chemical composition of clinopyroxenes (in terms of the content Ti—Zr-egirin and Zr-johansenite minals in them) with the stratigraphic rock level. It has been established that rocks of similar clinopyroxenes are grouped in the same location at different depths. For the first time, the highest content of ZrO2 (3.09 wt. %) was detected in the rocks of the eudialyte lujavrita complex, despite the fact that in these rocks is present eudialyte as widely distributed the zirconium phase and a possible scheme for the enrichment of rocks by this element is proposed.

Keywords:

pyroxenes, eudialyte lujavrites, Lovozero massif, zirconium

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References

Литература

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References

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Arzamastsev, A. A., Arzamastseva, L. V., Glaznev, V. N., Raevsky, A. B., 1998. Petrologic-Geophysical Model for the Structure and Composition of Deep levels of the Khibina and Lovozero Complexes, Kola Peninsula. Petrologiya 6, 478–496.

Arzamastsev, A. A., Arzamastseva, L. V., Zhirova, A. M., Glaznev, V. N., 2013. Model of Formation of the Khibiny–Lovozero Ore Bearing Volcanic–Plutonic Complex. Geology of Ore Deposits 55(5), 341–356.https://doi.org/10.1134/S1075701513050024

Arzamastsev, A. A., Belyatsky, B. V., Travin, A. V., Arzamastsev, L. V., Tsarev, S. E., 2005. Dike rocks in the Khibina massif: relations with the plutonic series, age and characteristics of the mantle source. Petrology 13, 267–288.

Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., Ivanyuk, G., 2008. The Khibina and Lovozero Alkaline Massifs: Geology and Unique Mineralization, in: 33 IGC Excursion 47, Apatity, 22 July — 2 August 2008, 11–14.

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Kogarko, L. N., Williams, C. T., Woolley, A. R., 2006. Compositional evolution and cryptic variation in pyroxenes of the peralkaline Lovozero intrusion, Kola Peninsula, Russia. Mineralogical Magazine, 70(4), 347–359. https://doi.org/10.1180/0026461067040340

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Mann, U., Marks, M., Markl, G., 2006. Influence of oxygen fugacity on mineral compositions in peralkaline melts: The Katzenbuckel volcano, Southwest Germany. Lithos 91, 262–285. https://doi.org/10.1016/j.lithos.2005.09.004

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Wu, B., Wang, R. C., Yang, J. H., Wu, F.-Y., Zhang, W.-L., Gu, X.-P., Zhang, A.-C., 2016. Zr and REE mineralization in sodic lujavrite from the Saima alkaline complex, northeastern China: A mineralogical study and comparison with potassic rocks. Lithos 262, 232–246. https://doi.org/10.1016/j.lithos.2016.07.013

Published

2018-03-01

How to Cite

Седова, А. М. and Евдокимов, М. Д. (2018) “Clinopyroxene from eudialyte lujavrites complex of the Lovozero alkaline massif (Kola Peninsula): Сharacteristics of the chemical composition and evolution”, Vestnik of Saint Petersburg University. Earth Sciences, 63(1), pp. 69–102. doi: 10.21638/11701/spbu07.2018.105.

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