The first petrological evidence of subduction at the western margin of the Siberian сraton

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Abstract

The discovery of relics of glaucophane schist in high-pressure tectonites of the suture zone of Yenisei Ridge has provided evidence for a Cordillera-type convergent boundary controlled by subduction of the oceanic crust beneath the continental margin on the western side of the Siberian Craton. According to the microtextural patterns of rocks and the results of geothermobarometry, two stages of metamorphism were distinguished. The formation of high-pressure tectonites indicates the early stage in the evolution of the Paleoasian Ocean and the final stage in the Neoproterozoic history of the Yenisei Ridge including completion of the accretion–subduction processes on the western margin of the Siberian Craton.

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About the authors

I, I, Likhanov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: likh@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

P. S. Kozlov

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: likh@igm.nsc.ru
Russian Federation, 7, Pochtovy, Ekaterinburg, 620151

K. A. Savko

Voronezh State University

Email: likh@igm.nsc.ru
Russian Federation, 1, University square, Voronezh, 394063

S. V. Zinoviev

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: likh@igm.nsc.ru
Russian Federation, 7, Pochtovy, Ekaterinburg, 620151; 1, Pirogova street, Novosibirsk, 630090

A. A. Krylov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: likh@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

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2. Fig. 1. (a) - the PRTZ scheme and its structural blocks in the northern part of the Yenisei Ridge, indicated by numbers in squares: 1 - continental gneiss-amphibolite, 2 - metabasite-ultrabasic, 3 - volcanoplutonic. (b) - the position of the PRTZ (light gray shade on a dark gray background) and tectonic blocks (numbers in circles) on the western edge of the Siberian Craton: 1 - East, 2 - Central northern segment, 3 - Angaro-Kan block, 4 - Isakovsky, 5 - Predivinsky terrany. 1 - cover (Pz – Kz); 2 - molasse (NP2-3); 3 - blastomilonites (NP) by rocks of the Garevsky complex (PP) (zone 1); 4 - high-pressure metabasite-ultrabasic and apo-gneiss blastomilonites (zone 2); 5 - metabasite and molasses complexes of the Isakovsky terrane (zone 3); 6 - granitoid complexes; 7 - shale occurrence elements: inclined (a), vertical (b); 8 - direction of tectonic movements (NP): supports (a), shifts (b); 9 - tectonic disturbances: faults, thrusts (a), other boundaries (b); 10 - the Yenisey fault; 11 - staurolite-garnet-kyanite tectonites; 12 - sampling points (large points indicate the points with findings of glaucophane). In (a) the blocks in the structure of the RTG are shown.

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3. Fig. 2. Relic inclusions of early stage minerals - glaucophane, albite, phengite, epidote (nicoli +) (a, c) in porphyroblasts of tectonite garnet from obr. 11, transmitted light (b).

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