Abstract
New U–Pb and Sm–Nd isotope data have been obtained in the Kandalaksha–Kolvitsa zone, Baltic Shield, on accessory zircon and rutile, along with whole-rock and secondary metamorphic minerals. Isotope U–Pb age of single zircon grains from metagabbro of the Kandalaksha Anorthosite Massif is 2453.5 ± 4.8 Ma, which is close to the U–Pb age of zircon from the Kolvitsa Massif metagabbro (2448 ± 5 Ma). For the first time, REEs in zircon grains of the Kandalaksha metagabbro have been analyzed and the results have been plotted. Ti-in-zircon thermometry has been applied using LA–ICP–MS: it yielded an average temperature of zircon crystallization of 844°C. The isotope and geochemical new data obtained indicate a magmatic genesis of the zircon crystals studied.
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Original Russian Text © E.N. Steshenko, A.I. Nikolaev, T.B. Bayanova, S.V. Drogobuzhskaya, V.V. Chashchin, P.A. Serov, L.M. Lyalina, A.I. Novikov, 2017, published in Doklady Akademii Nauk, 2017, Vol. 477, No. 5, pp. 595–599.
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Steshenko, E.N., Nikolaev, A.I., Bayanova, T.B. et al. The paleoproterozoic Kandalaksha Anorthosite Massif: New U–Pb (ID–TIMS) data and geochemical features of zircon. Dokl. Earth Sc. 477, 1454–1457 (2017). https://doi.org/10.1134/S1028334X17120194
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DOI: https://doi.org/10.1134/S1028334X17120194