Email this article 
FIRST DISCOVERY OF LOPARITE-(Ce) IN CARBONATITE OF THE GULI COMPLEX (POLAR SIBERIA, RUSSIA): ZONING OF CRYSTALS, ISOMORPHIC SUBSTITUTIONS AND GENETIC FEATURES
- Authors: Malitch K.N1, Sorokhtina N.V2, Kogarko L.N2, Shchapova Y.V1, Badanina I.Y.1, Bulatov V.A1, Chebykin N.S1
-
Affiliations:
- Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
- Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
- Issue: Vol 524, No 2 (2025)
- Pages: 251–261
- Section: MINERALOGY
- Submitted: 08.12.2025
- Published: 15.10.2025
- URL: https://journals.rcsi.science/2686-7397/article/view/356835
- DOI: https://doi.org/10.7868/S3034506525100097
- ID: 356835
Cite item
Open Access
Access granted
Subscription Access
Abstract
For the first time, loparite-(Ce) was found in a xenolith of phoscorite from the calcite carbonate of the Guli complex of the Maimecha-Kotui alkaline province (Krasnoyarsk Krai, Russia). Its composition is close to the end member (Na0.5LREE0.5)TiO3. Crystals of loparite-(Ce) occur in magnetite as relict inclusions, their intermediate and marginal zones are characterized by a zonal distribution of rare earth elements (REE). Local areas enriched in Nb and Th are recorded in the marginal zones. Compositional variations of loparite-(Ce) crystals are described by the following substitution schemes: Ca2+ + Ti4+ ↔ Na+ + (Nb + Ta)5+ and REE3+ + Ti4+ ↔ Ca2+ + (Nb + Ta)5+. Based on the results of Raman spectroscopy, areas differing in structure and chemical composition of REE were identified in loparite crystals. It is concluded that isomorphism affects the distortion of the crystal structure and the symmetry of vibrational modes. The obtained results indicate that loparite-(Ce) was formed at the early stages of crystallization of an alkaline-carbonatite immiscible melt, and the later crystallization of pyrochlore and zirconolite is consistent with the fact that the residual carbonate melt was enriched in fluorine, rare and radioactive elements.
About the authors
K. N Malitch
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Author for correspondence.
Email: dunite@yandex.ru
Ekaterinburg, Russia
N. V Sorokhtina
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Email: nat_sor@rambler.ru
Moscow, Russia
L. N Kogarko
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Email: kogarko@geokhi.ru
Academician of the RAS Moscow, Russia
Yu. V Shchapova
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Email: yu.shchapova@yandex.ru
Ekaterinburg, Russia
I. Yu Badanina
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Email: dunite@yandex.ru
Ekaterinburg, Russia
V. A Bulatov
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Email: dunite@yandex.ru
Ekaterinburg, Russia
N. S Chebykin
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Email: dunite@yandex.ru
Ekaterinburg, Russia
References
- Kogarko L.N., Williams C.T., Woolley A.R. Chemical evolution and petrogenetic implications of loparite in the layered, Agnatic Lovozero Complex, Kola Peninsula, Russia // Mineralogy and Petrology. 2002. V. 74. P. 1–24.
- Когарко Л.Н., Сорохтина Н.В., Кононкова Н.Н. Эволюции состава кальциртита и перовскита в фоскоритах и карбонатитах Гулинского щелочно-ультраосновного комплекса (Полярная Сибирь) // Геохимия. 2025. Т. 70. № 2. С. 22–41.
- Mitchell R.H., Welch M.D., Chakhmouradian A.R., Mills S. Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition // Mineral. Mag. 2017. V. 81. P. 411–461.
- Chakhmouradian A.R., Mitchell R.H., Pankov A.V., Chukanov N.V. Loparite and "metaloparite" from the Burpala alkaline complex, Baikal Alkaline Province (Russia) // Mineralogical Magazine. 1999. V. 63. P. 519–534.
- Зубкова Н.В., Аракчеева А.В., Пущаровский Д.Ю., Семенов Е.И., Атенсио Д. Кристаллическая структура лопарита // Кристаллография. 2000. Т. 45. № 2. С. 242–246.
- Mitchell R.H., Burns P.C., Chakhmouradian A.R. The crystal structures of loparite-(Ce) // The Canadian Mineralogist. 2000. V. 38. P. 145–152.
- Popova E.A., Lushnikov S.G., Yakovenchuk V.N., Krivovichev S.V. The crystal structure of loparite: a new acentric variety. Mineralogy and Petrology. 2017. V. 111. 827–832.
- Popova E.A., Yakovenchuk V.N., Lushnikov S.G., Krivovichev S.V. Structural phase transitions in loparite-(Ce): evidences from Raman light scattering // Journal of Raman Spectroscopy. 2014. V. 46. P. 161–166.
- Егоров Л.С. Ийолит-карбонатитовый плутонизм (на примере маймеча-котуйского комплекса Полярной Сибири). Л.: Недра, 1991. 260 с.
- Малич К.Н. Платиноиды клинопироксенит-дунитовых массивов Восточной Сибири (геохимия, минералогия, генезис). СПб.: Санкт-Петербургская картографическая фабрика ВСЕГЕИ, 1999. 296 с.
- Егоров Л.С. Фоскориты Маймеча-Котуйского ийолит-карбонатитового комплекса // Записки ВМО. 1992. Ч. 121. № 3. С. 13–26.
- Cooper A.F., Gittins J., Tuttle O.F. The system Na2CO3-K2CO3-CaCO3 at 1 kilobar and its significance in carbonatite petrogenesis // Amer. J. Sci. 1975. V. 275. P. 534–560.
- Kjarsgaard B.A., Hamilton D.L., Peterson T.D. Peralkaline Nephelinite/Carbonatite Liquid Immiscibility: Comparison of Phase Compositions in Experiments and Natural Lavas from Oldoinyo Lengai. Carbonatite volcanism. Oldoinyo Lengai and the petrogenesis of natrocarbonatites / Eds K. Bell, J. Keller. Berlin: Springer-Verlag, 1995. P. 163–190. https://doi.org/10.1007/978-3-642-79182-6
- Kogarko L.N. Role of CO2 on differentiation of ultramafic alkaline series: liquid immiscibility in carbonate-bearing phonolitic dykes (Polar Siberia) // Mineralogical Magazine. 1997. V. 61. P. 549–556.
- Feng D., Shivaramalah R., Navrotsky A. Rare-earth perovskites along the CaTiO3-Na0.5La0.5TiO3 join: Phase transitions, formation enthalpies, and implications for loparite minerals. American Mineralogist 2016. V. 101. P. 2051–2056.
- Когарко Л.Н., Сорохтина Н.В., Кононкова Н.Н., Климович И.В. Уран и торий в минералах карбонатитов Гулинского массива, Полярная Сибирь. // Геохимия. 2013. № 10. С. 855–866.
- Сорокшина Н.В., Липницкий Т.А., Жилкина А.В., Якушев А.И., Кононкова Н.Н. Геохимия пород редкометального месторождения Несковара щелочно-ультраосновного комплекса Вуорияры, Кольский полуостров // Геохимия. 2023. 68(11). С. 1133–1160.
- Юзюк Ю.И. Спектры комбинационного рассеяния керамик, пленок и сверхрешеток сегнетоэлектрических перовскитов (Обзор) // Физика твердого тела. 2012. 54(5). С. 963–993.
- Dwij V., De B.K., Tyagi S., Sharma G., Sathe V. Fano resonance and relaxor behavior in Pr doped SrTiO3: A Raman spectroscopic investigation. // Physica B: Condensed Matter. 2021. 620. 413265.
- Cowley R.A., Gvasaliya S.N., Lushnikov S.G., Roessli B., Rotaru G.M. Relaxing with relaxors: a review of relax or ferroelectrics // Advances in Physics. 2011. V. 60. P. 229–327.
Supplementary files
