The role of multi-stage deformations in the formation of the aptian orogenic gold mineralization of the Allakh-Yun zone of the Okhotsk-Koryak belt on the example of the Marinskoye deposit

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Resumo

Geological and structural observations carried out within the Marinskoye gold deposit of the Allakh-Yun zone of the Okhotsk-Koryak belt showed the occurrence of several deformation events and associated early and late orogenic mineralization during the Late Jurassic – Aptian subduction. The Late Jurassic stage D1 is characterized by structures of plastic deformations, green-schist metamorphism and early orogenic gold mineralization. The structures of the second deformation stage D2 (folds of shale cleavage, crenulation cleavage) are developed locally. Fragile ore-controlling structures of the third stage D3 are superimposed on plastic deformations after their exhumation. The obtained dating of 119.4±4.7 million years (40Ar/39Ar, sericite) of late orogenic gold mineralization is close to the estimates of age of large granitoid massifs with crust-mantle sources of the Allakh-Yun zone. The Late orogenic Marinskoye gold deposit was formed under conditions of compression and western transport of rocks during a change in the tectonic setting on the eastern active continental margin of the Siberian craton, related to the change in plate dynamics in the northern part of the Paleopacific at the beginning of the Aptian century.

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Sobre autores

V. Fridovsky

Diamond and Precious Metal Geology Institute, SB RAS

Autor responsável pela correspondência
Email: fridovsky@diamond.ysn.ru

Corresponding Member of the RAS

Rússia, Yakutsk

Y. Tarasov

Diamond and Precious Metal Geology Institute, SB RAS; Novosibirsk State University; North-East Interdisciplinary Scientific Research Institute n.a. N.A. Shilo, Far East Branch of the Russian Academy of Sciences

Email: fridovsky@diamond.ysn.ru
Rússia, Yakutsk; Novosibirsk; Magadan

L. Polufuntikova

Diamond and Precious Metal Geology Institute, SB RAS

Email: fridovsky@diamond.ysn.ru
Rússia, Yakutsk

M. Kudrin

Diamond and Precious Metal Geology Institute, SB RAS

Email: fridovsky@diamond.ysn.ru
Rússia, Yakutsk

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2. 1. The scheme of the geological structure of the western sector of the Okhotsk-Koryak orogen and the position of the Mariinskoye gold deposit. The letter abbreviations are tectonic zones: KL – Killakh, SD – Set– te-Daban and AYU-Allah-Yun. The inset shows the location of the Allah Yun metallogenic zone in the structures of the Verkhoyansk-Chukchi folded region. Letter abbreviations: SP – Siberian plateau , PKP - Priverkhoyansky marginal trough, VSNP – Verkhoyansky folded thrust belt, YAKO–Yano-Ko- the Lymsky orogen, ACHO – Arctic-Chukchi orogen, KO – Koryak orogen, OCH – Olyutorsko-Kamchatsky orogen, OCT – Okhotsk cratonic terrane, OCHVP – Okhotsk-Chukchi volcanic belt, South Anyui sutura, KOS– Kolymo-Omolonsky superterrane, OT – Omolonsky cratonic terrane

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3. Fig. 2. Diagram of the geological structure of the Marinskoye gold deposit (a) and the position of orogenic gold deposits in the Carboniferous-Permian deposits of the Allahyun zone (b). Diagrams of the poles of stratification (c), cleavage (d), quartz-carbonate veins of the western wing (e) and eastern wing (f) of the Marinskaya the anticlines are shown (upper hemisphere): blue non–filled squares are the poles of layering S0; green non–filled triangles are the poles of cleavage; red crosses are the poles of veins; Sn is the axial surface; b is the hinge of the fold; nS0 is the belt of the poles of layering; nS is the belt of the poles of cleavage; the dotted line in diagrams d and e is the pole belt of quartz veins (plane σ3/σ1); l is the direction of displacement; V are quartz and quartz–carbonate veins: V1 are consistent with the occurrence of rocks, V2 are longitudinally secant, V3 are transverse; paleotectonic stress axes: σ3 are compression, σ2 are intermediate, σ1 – stretching; n – number of measurements. The stratigraphic column shows: a dotted line – siltstones, dots – sandstones, triangles – diamictites, red circles – the position of gold deposits.

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4. 3. Shale cleavage and microdeformations of the host rocks: (a) the relationship of stratification (S0) and cleavage (S1); (b‒d) the structures of dissolution and recrystallization: (b) isometric polygonal polycrystalline quartz and incorporation structures at the boundary of quartz grains and plagioclase, (c) selective albitization of clastic plagioclase, (d) – structures of mosaic granulation of clastic quartz grains with the formation of a fine-grained aggregate; (d‒e) – shale microclimate: (e) – aggregate (cataclastic-segregationist) type, sandstone, (e) – intergranular (segregationist-trickle) type, siltstone; (g) – porphyroclastic systems and elongated quartz grains Qz1. In the center is a δ–type quartz porphyroclast; (h) is the initial stage of the development of antitaxial “growth beards" in the asymmetric pressure shadows of ankerite grains; (i) is the flatness cleavage S2. The abbreviation of the mineral names according to [15]: Qz1 – clastic quartz; Qz2 – recrystallization quartz; Pl – plagioclase; Ser – sericite; Ank1 – metasomatic ankerite; Ank2 – recrystallization ankerite; S0 – layering; S1 – shale cleavage; S2 – flatness cleavage

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5. Fig. 4. Quartz vein systems of the Marinskoye gold deposit: (a) – thin–banded quartz vein V0 consistent with rock occurrence; (b, c) - gold-quartz–carbonate veins: b – longitudinal vein V1 consistent with rock occurrence S0, longitudinal vein V2 secant rock occurrence, c - vein V3 transverse rock occurrence S0. The diagrams show the position of the S0 –stratification, V – quartz and quartz-carbonate veins using arcs of a large circle.

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6. Fig. 5. 40Ar/39Ar-age spectrum for sericite from a transverse quartz-carbonate vein (model MP-2-21) place of birth Maryinskoe. The localization of the sample is shown in Fig. 2. The micrograph shows the position of sericite between quartz and dolomite grains and its fusion with galena. The abbreviation of the names of minerals according to [15]: Qz – quartz, Dol – dolomite, Ser – sericite, Gn – galena

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