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Isotopic (Sr, Nd, Pb) characteristics of the archean metasomatized mantle—source of the Panozero massif, Karelia

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Abstract

This work addresses the isotopic heterogeneity of the Archean lithospheric mantle by the example of high-Mg, moderate-alkali, LILE and LREE-enriched Panozero sanukitoid massif, which is located in the Central Karelia, southeastern Baltic Shield. Initial Nd and Sr isotope characteristics were determined for mantle source of the massif. ɛNd(T) in the source are plotted below DM line, varying from + 0.7 to + 1.4 (+1.1, on average). The 87Sr/86Sr(T) ∼ 0.7017 significantly exceeds that of depleted mantle and reflects change of Rb/Sr ratio in the source due to metasomatic reworking of mantle. Data on Pb isotope composition of potassium feldspars indicate that source of monzonites of the Panozero Massif had lower μ (238U/204Pb) = 8 and higher (238Th/232U) = 4.05 relative to primitive mantle.

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Authors and Affiliations

  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    V. M. Savatenkov, S. B. Lobach-Zhuchenko & A. V. Kovalenko

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  1. V. M. Savatenkov
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  2. S. B. Lobach-Zhuchenko
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  3. A. V. Kovalenko
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Correspondence to V. M. Savatenkov.

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Original Russian Text © V.M. Savatenkov, S.B. Lobach-Zhuchenko, A.V. Kovalenko, 2010, published in Petrologiya, 2010, Vol. 18, No. 2, pp. 188–194.

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Savatenkov, V.M., Lobach-Zhuchenko, S.B. & Kovalenko, A.V. Isotopic (Sr, Nd, Pb) characteristics of the archean metasomatized mantle—source of the Panozero massif, Karelia. Petrology 18, 177–182 (2010). https://doi.org/10.1134/S0869591110020050

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