The first discovery of the paleoproterozoic aillikite dykes in Sarmatia: geochemistry and petrogenesis

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Abstract

The aillikite dykes of carbonate-biotite composition, intersecting the Paleoproterozoic banded iron formations, were discovered in the Kursk block of Sarmatia for the first time. Their age is 2.10–2.07 Ga. The aillikite dykes have undergone epidote-amphibolite facies metamorphism (550 °С, 2–3 kbar), they are deformed and fouled; primary magmatic olivine and pyroxene did not survive. Geochemically, the ultramafic lamprophyres of the Kursk block are close to the petrotypical aillikites. They have low SiO2 and Al2O3 concentrations, high MgO, TiO2, K2O, Cr, Ni, Nb and strongly fractionated LREE and HREE. According to available data, the aillikites and the Dubravinsky complex carbonatites could have been formed at different stages of melting of the uniform deep lithospheric source, which was enriched by lithophile elements shortly before the melting episode, possibly at the suprasubduction environment at ca. 2.1 Ga.

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About the authors

K. A. Savko

Voronezh State University; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences

Author for correspondence.
Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh; Moscow

A. V. Samsonov

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences

Email: ksavko@geol.vsu.ru

Corresponding Member of the RAS

Russian Federation, Moscow

S. V. Tsybulyaev

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

N. S. Bazikov

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

E. H. Korish

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

R. A. Terentiev

Voronezh State University

Email: ksavko@geol.vsu.ru
Russian Federation, Voronezh

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2. Fig. 1. Schematic geological map of the Tim structure and the position of the ayllikite dikes with insets of the structural scheme of Eastern Sarmatia and the East European Craton.

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3. Fig. 2. Ayllikit dikes in the Lebedinsky iron ore quarry: a, b – a series of thin dikes in the BIF (2.4–2.5 billion years); c – a deformed and sheared dike; d – adjacency of deformed BIF to the dike contact.

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4. Fig. 3. Chondrite-normalized distribution of rare earth elements (a) and primitive mantle-normalized distribution of minor and rare elements (b) in the ayllikite dikes of the Kursk block.

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5. Fig. 4. Compositions of ayllikites of the Kursk block of Sarmatia on the SiO2–(K2O+Na2O) diagram with fields of ultramafic and alkaline lamprophyres [14].

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