Geodynamic setting and models of the emplacement of ophiolitic allochthons in the structure of accreted island arcs of the pacific north-western framing
https://doi.org/10.32454/0016-7762-2019-2-5-11
Abstract
Based on the model of an oceanic island-arc breakup followed by accretion of rear and frontal parts of an arc to a continental margin of North-East Asia, the geodynamic nature of the ophiolites of Kamchatka and South Koryakia has been considered. The suprasubduction zone (SSZ) ophiolites originated in back-arc, fore-arc and intra-arc settings have been distinguished, and ophiolites of an ocean type have been distinguished only in one locality. The models of a SSZ ophiolites origin have been proposed. The emplacement of back-arc ophiolites has been supposed to be a result of the collapse (a closure) of a marginal basin, the emplacement of fore-arc ophiolites has been thought to be caused by their “pushing out” from a fore-arc basin, and the emplacement of the intra-arc basin ophiolites has been ascribed to a piling up of a newly formed basin crust before the beginning of the subduction. The emplacement of the ocean-type ophiolite in the front of the Olyutorsky folded structure has been attributed to a sliding accretion along the strike-slip fault movement related to the change in the motion direction of the Pacific plate 47 Ma ago.
About the Authors
V. D. Chekhovich
Geological Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
7, Pyzhevsky street, Moscow 19017.
A. N. Sukhov
Geological Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
7, Pyzhevsky street, Moscow 19017.
References
1. Accretionary tectonic of Western Kamchatka. Mos^w, Nayka Publ., 1993, 227 p. (In Russian)
2. Bogdanov N.A., Garver J.I., Chekhovich V.D., Palechek T.N., Ledneva G.V.,Soloviev A.V., Kovalenko D.V. Conditions of the formation of the flysh-olistostromal complex in Weste framing of Aleutian deep sea depression. Geotectonics, 1999, no. 5, pp. 52-56. (In Russian)
3. Verzhbizky E.V., Kononov M.V. Genesis of lithosphere of the Northern part of World ocean. Moscow, Nauchny Mir Publ., 2010, 478 p. (In Russian)
4. Geology of the Western part of the Bering Sea. Moscow, Nauka Publ., 1990, 158 p. (In Russian)
5. Geology of the Southern Koryak Hyland. Moscow, Nauka Publ., 1987, 168 p. (In Russian)
6. Kovalenko D.V., Stavrova O.O. Spatial distribution and geodynamic types of the of the Late Cretaceous and Early Paleogenic magmatic complexes of Kamchatka (paleomagnetic and isotop-geochemical characteristic). Doklady Earth Sciences, 2006, V. 420, no 2, pp. 221—224. (In Russian)
7. Konstantinovskaia E.A. Late Cretaceous back-arc basin of Kamchatka. Litology and mineral deposits, 1997, no. 2, pp. 58—78 (In Russian)
8. Soloviev A.V. Investigation of tectonic prosesses at the convergent settin of lithospgeric plate. Fission-track dating and structural analisis. Moscow, Nauka Publ., 2008, 318 p. (In Russian)
9. Stavsky A.P., Chekhovich V.D., Kononov M.V., Zonenschain L.P. Palinspastic reconstruction of the Anadir-Korial region. Geotectonics, 1988, no. 6, pp. 32—42 (In Russian)
10. Sukhov A.N., Tsukanov N.V., Belyatsky B.V., Rukavishnikova D.D. Back arc volcanic complexes of Late Mezosoic Achaayvaiam-Valagin paleoarc in Kumroch Range structutre (Eastern Kamchatka). Vestnik KRAUNZ, Earth Scienses, 2016, no. 4, pp. 20—34. (In Russian)
11. Tararin I.A., Badredinov Z.G., Chubarov V.M. Petrology and mineralization of metamorphic and magmatic complexes from Central and Eastern Kamchatka. Vladivostok, Dalnauka Publ., 2015, 302 p. (In Russian)
12. Chekhovich V.D., Sukhov A.N. Brake-up of Achaayvaiam-Valagin island arc in Paleocene {terrain of South Koryak and Eastern Kamchatka). Doklady Earth Scienses, 2006, vol. 409, no. 5, pp. 658—661. (In Russian)
13. Chekhovich V.D., Sukhov A.N., Kononov M.V., Palandjian S.A. Geodynamics of the South-West sector of the Pacific mobile belte in the Late Cretaceous — Early Paleogene. Geotectonics, 2009, no. 4, pp. 37—62. (In Russian)
14. Schapiro M.N. Late Mezosoic Achaayvaiam-Valagin arc (Kamchatka) and kinematics of the North Pacific plates. Geotectonics, 1995, no. 1, pp. 58-70.
15. Dilek Y, Furnes H. Ophiolite and their origin. Elements, 2014, V. 10, P. 93-100.
16. Whittaker J.M., Muller R.D., Sdrolias M. Revised history of Izanagi-Pacific ridge subduction. [https://www.researchgate.net/publication/267245544_Revised_history_of_Izanagi-Pacific_ridge_subduction (last accessed 15.12.2018).
Review
For citations:
Chekhovich V.D., Sukhov A.N. Geodynamic setting and models of the emplacement of ophiolitic allochthons in the structure of accreted island arcs of the pacific north-western framing. Proceedings of higher educational establishments. Geology and Exploration. 2019;(2):5-11. (In Russ.) https://doi.org/10.32454/0016-7762-2019-2-5-11
Views:
374
Email this article 