Abstract
A structural-geochemical study has been conducted on the dikes of presumably Devonian mafic rocks confined to a small graben filled in with Riphean sedimentary rocks hosted by Early Precambrian granite-gneiss of the Murmansk block. It has been demonstrated that the dolerite dikes of this region can be considered as manifestations of trap magmatism whose products fill in the foundation of the East Barents riftogenic downfold. In turn, manifestations of alkaline and kimberlite rocks of the White Sea region are confined to the peripheral portion of the trap magnetism area. Zircons from dolerite transecting Late Riphean sediments examined in two laboratories have a concordant age of 2.74–2.72 Ba, while zircons from a similar dike located in granite-gneiss of the basement are characterized by an age range of 2700–155 Ma, and the concordant age based on 4 points is 790 Ma. All these factors indicate that the age determinations of the mafic rocks are ambiguous, particularly in the zone of transition from the center of the trap province to its periphery, where alkaline magmatism is observed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. du Toit, The Geology of South Africa (Izd-vo inostr. lit., Moscow, 1957) [in Russian].
V. N. Puchkov, Geotektonika, No. 1, 3–22 (2009).
R. E. Ernst and K. Bell, Miner. and Petrol. 98, 55–76 (2010).
K. D. Belyaev and L. I. Uvad’ev, Sov. Geologiya, No. 2, 67–76 (1977).
I. L. Makhotkin and P. Yu. Zherdev, Dokl. Akad. Nauk 329(4), 484–489 (1993).
A. A. Arzamastsev, Zh. A. Fedotov, and L. V. Arzamastseva, Dike Magmatism of the Northeastern Part of the Baltic Shield (Nauka, St. Petersburg, 2009) [in Russian].
A. S. Baluev and E. N. Terekhov, “Tectonics and Geodynamics of Phanerozoic Fold Belts and Platforms,” in Proceedings of the 43rd Tectonic Meeting (Geos, Moscow, 2010), Vol. 1 [in Russian].
A. S. Baluev and E. N. Terekhov, Dokl. Akad. Nauk 406(5), 651–655 (2006).
L. V. Makhlaev and I. I. Golubeva, in Problems of Geology and Mineralogy (Syktyvkar, 2006), pp. 143–159 [in Russian].
I. S. Willians, Rev. Econ. Geol, No. 7, 1–35 (1998).
V. L. Zlobin, M. M. Bogina, M. V. Mints, et al., Dokl. Akad. Nauk 435(1), 64–68 (2010).
S. G. Skolotnev, V. E. Bel’tenev, E. N. Depekhina, et al., Geotektonika, No. 6, 24–59 (2010).
V. N. Kozhevnikov and S. G. Skublov, Dokl. Akad. Nauk 430(5), 681–685 (2010).
N. V. Vladykin and E. A. Lepekhina, Dokl. Akad. Nauk 429(6), 774–778 (2009).
Author information
Authors and Affiliations
Additional information
Original Russian Text © E.N. Terekhov, A.S. Baluev, T.F. Shcherbakova, I.S. Ipat’eva, 2012, published in Doklady Akademii Nauk, 2012, Vol. 442, No. 6, pp. 795–804.
Rights and permissions
About this article
Cite this article
Terekhov, E.N., Baluev, A.S., Shcherbakova, T.F. et al. Age paradoxes of Devonian magmatism of the northeastern part of the Kola Peninsula. Dokl. Earth Sc. 442, 226–234 (2012). https://doi.org/10.1134/S1028334X12020274
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1028334X12020274