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Archean rock homologs in the Kola superdeep borehole section in the northern part of the White Sea mobile belt, Voche-Lambina test site

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Abstract

The Archean Complex homologs of the Kola superdeep borehole (SG-3) were identified in the northern part of the White Sea mobile belt. Tonalite-trondhjemite-granodiorite gneisses of the Voche-Lambina test site and metavolcanic dacite-rhyodacite rocks of the borehole SG-3 were formed at the stages of 2.97–2.82, ∼2.81, and 2.78–2.79 Ga. The Sm-Nd model ages of the studied rocks do not exceed 3.1 Ga, and their positive ɛNd(t) values vary from +0.5 to +3.34. They are characterized by Mg# = 0.20−0.44, similar concentrations (HFSE) of Zr, Nb, Y, and also Rb, Cr, and Ni, and sharply differentiated spectra of the REE distribution (Ce/Sm = 3.2−5.8; Gd/Yb = 2.6−7.1). Primary melts were formed in balance with garnetamphibole restite under P ≥ 15−16 kbar.

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Authors and Affiliations

  1. Geological Institute, Kola Scientific Center, Russian Academy of Sciences, Apatity, Murmansk oblast, Russia

    L. N. Morozova, F. P. Mitrofanov, T. B. Bayanova, V. R. Vetrin & P. A. Serov

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  1. L. N. Morozova
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  2. F. P. Mitrofanov
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  3. T. B. Bayanova
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  4. V. R. Vetrin
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  5. P. A. Serov
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Correspondence to L. N. Morozova.

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Original Russian Text © L.N. Morozova, F.P. Mitrofanov, T.B. Bayanova, V.R. Vetrin, P.A. Serov, 2012, published in Doklady Akademii Nauk, 2012, Vol. 442, No. 2, pp. 215–218.

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Morozova, L.N., Mitrofanov, F.P., Bayanova, T.B. et al. Archean rock homologs in the Kola superdeep borehole section in the northern part of the White Sea mobile belt, Voche-Lambina test site. Dokl. Earth Sc. 442, 28–31 (2012). https://doi.org/10.1134/S1028334X12010187

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  • DOI: https://doi.org/10.1134/S1028334X12010187

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