Email this article Ultramafic-alkaline-carbonatite complexes as a result of two-stage melting of mantle plume: evidence from the mid-paleoproterozoic Tiksheozero intrusion, Northern Karelia, Russia
- Authors: Sharkov E.V.1, Chistyakov A.V.1, Bogina M.M.1, Bogatikov O.A.1, Shchiptsov V.V.2, Belyatsky B.V.3, Frolov P.V.2
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Affiliations:
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
- Karelian Research Center of the Russian Academy of Sciences
- A.P. Karpinsky Russian Geological Research Institute
- Issue: Vol 486, No 4 (2019)
- Pages: 460-465
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/14459
- DOI: https://doi.org/10.31857/S0869-56524864460-465
- ID: 14459
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Abstract
Tiksheozero ultramafic-alkaline-carbonatite intrusive complex, like numerous carbonatite-bearing complexes of similar composition, is a part of large igneous province, related to the ascent of thermochemical mantle plume. Our geochemical and isotopic data evidence that ultramafites and alkaline rocks are joined by fractional crystallization, whereas carbonatitic magmas has independent origin. We suggest that origin of parental magmas of the Tiksheozero complex, as well as other ultramafic-alkaline-carbonatite complexes, was provided by two-stage melting of the mantle-plume head: 1) adiabatic melting of its inner part, which produced moderately-alkaline picrites, which fractional crystallization led to appearance of alkaline magmas, and 2) incongruent melting of the upper cooled margin of the plume head under the influence of CO2-rich fluids that arrived from underlying zone of adiabatic melting gave rise to carbonatite magmas.
About the authors
E. V. Sharkov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Author for correspondence.
Email: sharkov@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
A. V. Chistyakov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: sharkov@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
M. M. Bogina
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: sharkov@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
O. A. Bogatikov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: sharkov@igem.ru
Academician of the Russian Academy of Sciences
Russian Federation, 35, Staromonetny, Moscow, 119017V. V. Shchiptsov
Karelian Research Center of the Russian Academy of Sciences
Email: sharkov@igem.ru
Russian Federation, 11, Poushkinskaya street, Petrozavodsk, Karelia, 185910
B. V. Belyatsky
A.P. Karpinsky Russian Geological Research Institute
Email: sharkov@igem.ru
Russian Federation, 74, Sredny prospect, St. Petersburg,199106
P. V. Frolov
Karelian Research Center of the Russian Academy of Sciences
Email: sharkov@igem.ru
Russian Federation, 11, Poushkinskaya street, Petrozavodsk, Karelia, 185910
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