Age and geodynamic position of ophiolites of the Kurtushiba Ridge of the Western Sayan

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Abstract

The composition of metadiabase dykes, metabasalt lavas and plagiogranite veins of ophiolite association in the upper reaches of the Koiard River of the Kurtushiba Ridge has been studied. The results of geochemical studies show that these ophiolites are characterized by N-MORB+IAB–like composition. The U-Pb age of the ophiolites is 569±6 Ma. The ophiolites of the Kurtushiba Ridge, along with the ophiolites of the Shatsky massif in Western Tuva and the island-arc complexes of the Ondum subzone, were formed simultaneously or close in time, ~578–569 Ma, at the early stage of evolution of the Tannuola-Khamsara paleo-island arc.

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About the authors

A. A. Mongush

Tuvinian Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: amongush@inbox.ru
Russian Federation, Kyzyl

N. I. Gusev

A.P. Karpinsky Russian Geological Research Institute

Email: amongush@inbox.ru
Russian Federation, St. Petersburg

C. K. Oydup

Tuvinian Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences

Email: amongush@inbox.ru
Russian Federation, Kyzyl

C. O. Kadyr-ool

Tuvinian Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences

Email: amongush@inbox.ru
Russian Federation, Kyzyl

C. M. Hertek

Tuvinian Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences

Email: amongush@inbox.ru
Russian Federation, Kyzyl

F. P. Lesnov

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: amongush@inbox.ru
Russian Federation, Novosibirsk

E. K. Druzhkova

Tuvinian Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences

Email: amongush@inbox.ru
Russian Federation, Kyzyl

References

  1. Ярмолюк В.В., Коваленко В.И., Ковач В.П., Рыцк Е.Ю., Козаков И.К., Котов А.Б., Сальникова Е.Б. Ранние стадии формирования Палео-Азиатского океана: результаты геохронологических, изотопных и геохимических исследований позднерифейских и венд-кембрийских комплексов Центрально-Азиатского складчатого пояса // Доклады академии наук. 2006. Т. 410. № 5. С. 657–662.
  2. Берзин Н.А., Кунгурцев Л.В. Геодинамическая интерпретация геологических комплексов Алтае-Саянской области // Геология и геофизика. 1996. Т. 37. № 1. С. 63–81.
  3. Куренков С.А., Диденко А.Н., Симонов В.А. Геодинамика палеоспрединга. М.: ГЕОС, 2002. 294 с.
  4. Волкова Н.И., Ступаков С.И., Бабин Г.А., Руднев С.Н., Монгуш А.А. Подвижность редких элементов при субдукционном метаморфизме (на примере глаукофановых сланцев Куртушибинского хребта, Западный Саян) // Геохимия. 2009. Т. 47. № 4. С. 401–414.
  5. Добрецов Н.Л., Пономарева Л.Г. Офиолиты и глаукофановые сланцы Западного Саяна и Куртушибинского пояса // Петрология и метаморфизм древних офиолитов (на примере Полярного Урала и Западного Саяна). Новосибирск: Наука, 1977. С. 128–156.
  6. Mongush A.A., Olschewski P. A new look at the geodynamic development of the Ediacaran–early Cambrian forearc basalts of the Tannuola-Khamsara Island Arc (Central Asia, Russia): Conclusions from geological, geochemical, and Nd-isotope data // Open Geosciences. 2024. 16: 20220586.
  7. Добрецов Н.Л., Буслов М.М. Позднекембрийско-ордовикская тектоника и геодинамика Центральной Азии // Геология и геофизика. 2007. Т. 48. № 1. С. 186–201.
  8. Дятлова И.Н., Бублик А.И., Шарифулин С.К. Месторождения нефрита Западного Саяна // Природные ресурсы, среда и общество. 2023. № 2. С. 14–33.
  9. Монгуш А.А. Офиолиты Западного Саяна и Западной Тувы – автохтонные комплексы Саяно-Тувинской преддуговой зоны V-Є1 островной дуги Палеоазиатского океана / Геодинамическая эволюция литосферы Центрально-Азиатского подвижного пояса (от океана к континенту): Материалы совещания. Иркутск: ИЗК СО РАН, 2017. С. 194‒196.
  10. Руднев С.Н., Мальковец В.Г., Белоусова Е.А., Туркина О.М., Семенова Д.В. Изотопный Lu-Hf состав циркона и источники магм венд-раннепалеозойских гранитоидов Тувы (на примере Каахемского и Восточно-Таннуольского батолитов) // Геология и геофизика. 2020. Т. 61. № 10. С. 1331–1355.
  11. Cabanis B., Lecolle M. Le diagramme La/10 – Y/15 – Nb/8: Un outil pour la discrimination des series volcaniques et en evidence des mélange et/ot de vontaminationcrustale // ComptesRendus de l’Académie des Sciences. Série II. 1989. V. 309. P. 2023‒2029.
  12. Condie K.C. High field strength element rations in Archean базальты: a window to evolving sources of mantle plumes? // Lithos. 2005. V. 79. P. 491–504.
  13. Agrawal S., Guevara M., Verma S.P. Tectonic Discrimination of Basic and Ultrabasic Volcanic Rocks through Log-Transformed Ratios of Immobile Trace Elements. International Geology Review, 2008. V. 50(12). P. 1057–1079.
  14. Монгуш А.А. Геологическое положение, геохимический и Sm-Nd изотопный состав офиолитов Саяно-Тувинской преддуговой зоны // Известия Иркутского госуниверситета. Серия “Науки о Земле”. 2019. Т. 30. С. 56–75.
  15. Furnes H., Safonova I. Ophiolites of the Central Asian Orogenic Belt: Geochemical and petrological characterization and tectonic settings // Geoscience Frontiers. 2019. V. 10(4). P. 1255–1284.
  16. Беззубцев В.В., Перфилова О.Ю. Государственная геологическая карта Российской Федерации. Масштаб 1 : 1 000 000 (третье поколение). Серия Алтае-Саянская. Лист N-46 (Абакан). СПб.: ВСЕГЕИ, 2008.
  17. Corfu F., Hanchar J.M., Hoskin P.W.O., Kinny P. Atlas of Zircon Textures // Mineralogy and Geochemistry. 2003, V. 53. P. 469–500.
  18. Монгуш А.А., Лебедев В.И., Травин А.В., Ярмолюк В.В. Офиолиты Западной Тувы – фрагменты поздневендской островной дуги Палеоазиатского океана // ДАН. 2011. Т. 438. № 6. С. 796–802.

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2. Fig. 1. Geological position and structure of ophiolites of the Kurtushibinsky range. A. V– Island arc systems of the Altai-Sayan folded region and Western Mongolia (compiled using data from [7]). 1 – Tuva-Mongolian island-arc system and its segments: Tannuol-Khamsarinsky (T-X), Severo-Sayansky (S—S), Ozerny (O); 2 - other island-arc systems: S – Salairskaya, D – Dzhidinskaya, K-A – Kuznetsk-Altai. Structural and formation zones and subzones of the Tannuola-Khamsara segment (compiled using data from [2]): 1 – Sayano-Tuva pre–arc zone (CT), subzones: J - Dzhebashskaya, Ksh – Kurtushibinskaya, Ht – Khemchik-Tapsinskaya; 2 – Tannuola-Khamsara island arc zone (TX), subzones: Ta – Tannuol, On – Ondum, Hc – Khamsara; 3 – East Tuvan back-arc zone (VT), subzones: Ag - Agardag, Kh – Kaakhem, Uo – Ulugo, Hr – Kharal. C-C is the North Sayan island arc zone. HC is the Khemchik-Systyghem collision zone. The Western Sayan Conflict Zone. TMM is the Tuvan-Mongolian microcontinent. Zvezdochka – Shatsky ophiolite massif. V. Geological structure of the ophiolites of the Koyard site (compiled using data from [8]). 1 – Q sediments; 2 – V2 metabasalts, metatuffs, and shales of the Chingin lower stratum; 3-6 – V2 ophiolites: 3 – lavas of metabasalts, single interlayers and lenses of silicites, quartzites; 4 – dikes of basic composition; 5 – serpentinites: a – massive, b – conglomerate and shale, 6 – a – peridotites the “nuclear” parts of the arrays, b – pyroxenites; 7 – melange; 8 – metasomatites: a – zones of rodingites, tremolites, listvenites, b – veins of rodingites; 9: a – faults, b – thrusts; 10 – geological boundaries: a – reliable, b – assumed; 11 — sampling points and sample numbers. d. Schematic section of ophiolites of the Koyard site (compiled using data [3]): 1 – plagiogranite veins; 2-3 – magmatic breccias of ophiolites with different cements: 2a — basalt, 2b — plagiogranite, 3a — diabase, 3b – clinopyroxenite. The remaining symbols are shown in Fig. 1 in

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3. Fig. 2. The distribution spectra of rare earth (a, c) and rare (b, d) elements normalized by chondrite and primitive mantle [9] for ophiolites of the Koyard site (according to Table 1). Data on metabasalts of the Koyard site [4] and on rocks of the Ondumskaya Ostrov-arc subzone were also used, includingC. andesibasalts, andesites, and plagiorioliths of the Ondum formation [9] and plagiogranitoids of the Buren massif [10]

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4. Fig. 3. Discriminant diagrams for the ophiolites of the Koyard site (based on data from Table. 1 and [4]): (a) La/10 – Y/15 – Nb/8 [12]. Composition fields: 1 – basalts of island arcs: 1A – calcareous-alkaline basalts, 1C – island-arc tholeiites, 1B – area of overlap between 1A and 1C; 2 – continental basalts: 2A – continental basalts, 2B – basalts of back–arc basins; 3 - basalts of mid-oceanic ridges (SOX): ZC – medium-enriched, 3D – normal; (b) Nb/Th – Zr/Nb [13]. Basalts: Arc – island arcs, N-MORB – normal COX, OPB – oceanic plateaus, OIB – oceanic islands; (c) DF 1 – DF 2 [14]

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5. Fig. 4. Concordia diagram for zircons from the plagiogranite K 22-3 sample (a) and zircon grains in the cathodoluminescence mode (b)

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