Strike-slip fault tectogenesis in formation of the East Sikhote-Alin volcano-plutonic belt: Structural and dynamic analysis

Study object. The role of strike-slip fault tectogenesis in magmatism of the large (North Eastern Primorye) fragment of the Eastern Sikhote-Alin volcano-plutonic belt (ESAVPB) is studied.
Materials and methods. The materials of geological mapping and field geostructural thematic-line research are used. Study methods are based on the concept of the geostructural patterns being formed by lateral, namely, strike-slip movements of crustal blocks.
Results. There is recognized the system of the NE-trending sinistral faults, whose activation taken place during two stages. The pre-Late-Cretaceous fold-and-strike-slip-fault (orogenic) stage is characterized by the widely developed fold system within the stratified formations covering active strike-slip faults of the pre-Mesozoic consolidated basement. By the Late Cretaceous, the strike-slip faults cut the fold system into narrow blocks, creating the preconditions for the strike-slip faults’ activation during the next destructionand-strike-slip-fault (riftogenic) stage (Late Cretaceous – Cenozoic). During the latter, the strike-slip faults were activated under transtension (strike slip with extension) with formation of volcano-tectonic extension structures (VTES) nearcrosswise the strike-slip faults. The VTES played, on the one hand, the role of magma-feeding channels. On the other hand, the extension caused preconditions for formation of the depression subsidences that accumulated large volumes of the volcanics covering and «crosslinking» the VTES, resulting in wide development of volcanic covers within the ESAVPB.
Conclusion. The VTES’ opening is thereby the effect of lateral (strike-slip) displacements of continental geoblocks that is not consistent with a priori ideas of the development of the East Sikhote-Alin volcano-plutonic belt under the oceanic plates’ subduction. The resulting materials complement the formulations according to which the East Asian volcanic belt formed under the structural-and-dynamic conditions being caused by the evolution of the East Asian global strike-slip fault zone resulting from displacement of the Asian continent to the south-west under the Earth’s rotational geodynamics.

1. Burtman V.S., Luk’yanov A.V., Peive A.V., Ruzhentsev S.V., Suvorov A.I., Trifonov V.G., Koptev V.V., Shcherba I.G. (1963) Horizontal movement along faults, and some methods of their study. Razlomy i gorizontal’nye dvizheniya zemnoi kory [Faults and horizontal movements of the Earth’s crust]. Moscow, Nauka Publ., 29-43. (In Russian)

2. Ivanov B.A. (1961) Central Sikhote-Alin fault (strike-slip fault). Dokl. AN SSSR, 138(4), 900-903. (In Russian)

3. Ivanov B.A. (1972) Tsentral’nyi Sihote-Alinskii razlom [Central Sikhote-Alin fault]. Vladivostok, Dal’nevostochnoe Knizhnoe Izd. Publ., 115 p. (In Russian)

4. Luk’yanov A.V. (1965) Strukturnye proyavleniya gorizontal’nykh dvizhenii zemnoi kory [Structural manifestations of horizontal crustal movements]. Moscow, Nauka Publ., 211 p. (In Russian)

5. Mitrokhin A.N. (1991) Geodinamika formirovaniya razryvnykh rudokontroliruyushchikh struktur Pridorozhnogo i Oktyabr’skogo mestorozhdenii (Komsomol’skii raion). Dis. … kand. geol.-min. nauk [Geodynamics of formation of fault ore-controlling structures for the Pridorozhnoe and Oktyabr’skoe ore deposits (the Komsomol’sk mineral district). Cand. geol. and min. sci. diss.]. Vladivostok, DVGI DVO AN SSSR, 235 p. (In Russian)

6. Nazarenko L.F., Bazhanov V.A. (1987) Geologiya Primorskogo kraya. Ch. III. Osnovnye cherty tektoniki i istorii razvitiya [Geology of the Primor’e Territory. Part III. The main features of the tectonics and history of formation]. Vladivostok, Far Eastern Branch Academy of Sciences of the USSR, 60 p. (In Russian)

7. Nevolin P.L. (1995) Geodinamika formirovaniya struktur mestorozhdenii Kavalerovskogo raiona [Geodynamics of formation of the ore deposits’ structures for Kavalerovo mineral district]. Vladivostok, Dal’nauka Publ., 132 p. (In Russian)

8. Oleinikov A.V., Vysochin V.N., Kovalenko S.V., KutubZade T.K., Starchenko A.S. (1979) Geologicheskoe stroenie i poleznye iskopaemye basseinov rek Venyukovki, Kaban’ei i Kilou [Geological structure and mineral resources of the river basins of Venyukovka, Kaban’ya, and Kilou]. Vladivostok, Primorgeologiya Publ., 301 p. (In Russian)

9. Ridel W. (1929) Zur Mechanik geologischer Brucherscheinungen. Cent. Miner., Geol. Paleontol. Bull., 1, 78-97.

10. Ryazanov G.V. (1973) Morfologiya i genesis skladok Nepskoi zony (yuzhnaya chast’ Sibirskoi platformy) [Morphology and genesis of folds of the Nepa zone (the southern part of the Siberian platform)]. Novosibirsk, Nauka Publ., 90 p. (In Russian)

11. Utkin V.P. (1976) Shear Zones of the Central Sikhote-Alin. Dokl. AN SSSR, 229(4), 955-958. (In Russian)

12. Utkin V.P. (1978) East Asian global strike-slip fault zone, the volcanic belt and marginal seas. Dokl. AN SSSR, 240(2), 400-403. (In Russian)

13. Utkin V.P. (1980) Sdvigovye dislokatsii i metodika ikh izucheniya (Strike-slip related dislocations and methods of their study). Moscow, Nauka Publ., 144 p. (In Russian)

14. Utkin V.P. (1987) Sdvigovye dislokatsii i ikh rol’ v proyavleniyakh magmatizma i rudoobrazovaniya Aziatsko-Tikhookeanskoi zony perekhoda. Dis. dokt. geol.-min. nauk [Strike-slip related dislocations and their role in occurrences of magmatism and ore formation of the Asia-Pacific transition zone. Diss. dokt. geol. and min. sci.)]. Vladivostok, DVGI DVO AN SSSR, 451 p. (In Russian)

15. Utkin V.P. (1989) Sdvigovye dislokatsii, magmatizm i rudoobrazovanie (Strike-slip dislocation, magmatism and ore formation). Moscow, Nauka Publ., 166 p. (In Russian)

16. Utkin V.P. (2005) Structure, geochronology and structural and dynamic conditions of the vertical development of the Eastern Sikhote-Alin magmatic-metallogenic belt. Dokl. Akad. Nauk, 404(5), 659-663. (In Russian)

17. Utkin V.P. (2019) Strike-slip related tectogenesis and structure-forming flow of crustal masses of the AsiaPacific transition zone. Litosfera, 19(5), 780-799. (In Russian). https://doi.org/10.24930/1681-9004-2019-19-5-780-799.

18. Utkin V.P., Mitrokhin A.N., Nevolin P.L. (2016) Strike-slip related continental rifting of the eastern margin of Asia. Litosfera, (4), 5-29. (In Russian)

19. Utkin V.P., Sorokin B.K., Yushmanov Yu.P., Oleinikov A.V., Zhukovskaya A.V. (1980) Geologo-strukturnye usloviya zoloto-serebryanogo orudeneniya v yuzhnoi chasti Samarginskogo rudnogo raiona [Geological and structural conditions of gold-silver mineralization within the southern part of the Samarga ore district]. Vladivostok, Primorgeologiya, 268 p. (In Russian)

20. Voronov P.S. (1968) Ocherki o zakonomernostyakh morfologii global’nogo rel’efa Zemli [Essays on the morphology of the global patterns of Earth’s topography]. Leningrad, Nauka Publ., 123 p. (In Russian)

21. Vulkanicheskie poyasa Vostoka Azii: Geologiya i metallogeniya [Volcanic belts of eastern Asia: Geology and metallogeny]. (1984) (Ed. A.D. Shcheglov). Moscow, Nauka Publ., 504 p. (In Russian)

22. Yaroshevskii V.T. (1981) Tektonika razryvov i skladok [Tectonics of faults and folds]. Moscow, Nedra Publ., 245 p. (In Russian)