Paleoproterozoic granitoids in the Luktur Complex, the Yurovsky Uplift (Okhotsk Massif): composition, age and genesis according to geochemical, Nd-Sr isotope-geochemical and U-Pb geochronological data

The Luktur granitoid complex of the Yurovka terrane is mainly composed of sub-alkali leucogranite, granite, and granosyenite with a subordinate occurrence of normal and alkali feldspar granite, as well as quartz syenite and monzonite. Granitoids are characterized by elevated alkalinity, potassium type of alkalinity, enrichment in REE, but in general, their geochemical features vary in a wide range; no differentiation trends are marked. The similarity of geochemical, Nd-Sr isotopic and U-Pb geochronological parameters of granitoids of the Luktur Complex and metavolcanics of the Yurovka Complex was identified. The Luktur granitoids resulted from the anathectic melting of variable Yurovka metamorphic lithologies. According to the parameters of Sm-Nd and Rb-Sr isotopic systems, the lower age limit of the formation of the crystalline basement of the Yurovka terrane is estimated to be 2300 Ma. The U-Pb (SHRIMP II) age based on zircon from the Luktur Complex was determined to be 1975 ± 36, 1969 ± 13 and 1964 ± 13 Ma. The combination of isotope, geochemical and geochronological data suggest that both Luktur granitoids and Yurovka metavolcanics were formed in the Paleoproterozoic. Thus, two terranes of different ages can be distinguished within the Okhotsk massif – Paleoarchean Kukhtui terrane and Paleoproterozoic Yurovka terrane.

1. Borodin L. S. Petrokhimicheskaya klassifikatsiya i etalonnye sostavy granitoidov. Geokhimiya, 1992, no. 1, pp. 57–67. (In Russian).

2. Velikoslavinskiy S. D. Tipizatsiya kislykh magmaticheskikh porod vedushchikh geodinamicheskikh obstanovok. Petrologiya, 2003, vol. 11, no. 4, pp. 363–380. (In Russian).

3. Vel’dyaksov F. F., Umitbaev R. B. Osnovnye cherty tektoniki i metallogenii Okhotskogo sredinnogo massiva i ego obramleniya. Skladchatye sistemy Dal’nego Vostoka. Vladivostok, 1976, pp. 93–117. (In Russian).

4. Geologicheskaya karta SSSR masshtaba 1 : 200 000. Seriya Priokhotskaya. List O-54-IV. Ob”yasnitel’naya zapiska [Geological Map of the USSR, Scale 1 : 200,000. Priokhotskaya Series. Sheet O-54-IV. Explanatory Notes]. Eds.: V. G. Korol’kov. Magadan, 1980, 79 p.

5. Geologicheskaya karta SSSR. Masshtab 1 : 1 000 000 (novaya seriya). List O-(53), 54-Okhotsk. Ob”yasnitel’naya zapiska [Geological Map of the USSR, Scale 1 : 1,000,000 (new series). Sheet O-(53), 54-Okhotsk. Explanatory Notes]. Eds.: A. L. Stavtsev. Leningrad, 1986, 128 p.

6. Gosudarstvennaya geologicheskaya karta Rossiyskoy Feder atsii. Masshtab 1 : 1 000 000 (tret’e pokolenie). List R-54 – Oymyakon. Ob”yasnitel’naya zapiska [State Geological Map of the Russian Federation. Scale 1 : 1,000,000 (3rd Generation). Sheet R-54 – Oymyakon. Explanatory Notes]. Eds.: G. G. Kazakova, A. F. Vas’kin, A. P. Kropachev, O. I. Shcherbakov, A. V. Prokop’ev, A. K. Khudoley, L. A. Sharov, T. K. Ivanova, V. K. Kuz’min, O. V. Zheleboglo, V. I. Makar. St.-Petersburg, VSEGEI, 2013, 400 p.

7. Grinberg G. A. Dokembriy Okhotskogo massiva. Moscow, Nauka, 1968, 187 p.

8. Korol’kov V. G., Rudnik V. A., Sobotovich E. V. O pozdneazoyskom-rannearkheozoyskom vozraste drevneyshikh porod Okhotskogo sredinnogo massiva. DAN USSR, 1974, vol. 219, no. 6, pp. 1441–1444. (In Russian).

9. Kuz’min V. K. Geologicheskoe stroenie kristallicheskogo fundamenta Yurovskogo podnyatiya (Okhotskiy massiv). Ti khookeanskaya geologiya, 1993, no. 5, pp. 67–78. (In Russian).

10. Kuz’min V. K., Bogomolov E. S., Glebovitskiy V. A. Pervye Sm-Nd izotopno-geokhimicheskie dannye o paleoproterozoyskom vozraste metamorficheskikh porod kristallicheskogo fundamenta Yurovskogo podnyatiya (Okhotskiy massiv). Doklady RAN, 2017, vol. 472, no. 1, pp. 62–67. (In Russian).

11. Kuz’min V. K., Bogomolov E. S., Glebovitskiy V. A., Rodionov N. V. et al. Drevneyshie granity Rossii – paleoarkheyskie (3343 mln let) subshchelochnye granity Okhotskogo massiva. Doklady RAN, 2018, vol. 478, no. 6, pp. 662–668. (In Russian).

12. Kuz’min V. K., Glebovitskiy V. A., Matukov D. I. et al. Drevneyshie osnovnye granulity Severo-Vostoka Rossii (Okhotskiy massiv). Doklady RAN, 2005, vol. 402, no. 2, pp. 217–221. (In Russian).

13. Kuz’min V. K., Glebovitskiy V. A., Proskurnin V. F. et al. Paleoproterozoyskie granitoidy kristallicheskogo fundamenta Yurovskogo podnyatiya (Okhotskiy massiv) – pervye U-Pb SHRIMP II geokhronologicheskie i Nd-Sr izotopno-geokhimicheskie dannye. Doklady RAN, 2018, vol. 478, no. 2, pp. 196–200. (In Russian).

14. Kuz’min V. K., Glebovitskiy V. A., Rodionov N. V. et al. Glavnye etapy formirovaniya paleoarkheyskoy kory Kukhtuyskogo vystupa Okhotskogo massiva. Stratigrafiya. Geo logicheskaya korrelyatsiya, 2009, vol. 17, no. 4, pp. 3–22. (In Russian).

15. Kuz’min V. K., Chukhonin A. P., Shuleshko I. K. Etapy metamorficheskoy evolyutsii porod kristallicheskogo fundamenta Kukhtuyskogo podnyatiya (Okhotskiy massiv). Doklady RAN, 1995, vol. 342, no. 6, pp. 789–791. (In Russian).

16. Natapov L. M., Surmilova E. P. Pozitsiya i priroda Okhotskogo massiva. Otechestvennaya geologiya, 1995, no. 2, pp. 49–53. (In Russian).

17. Tektonika, glubinnoe stroenie, metallogeniya oblasti sochleneniya Tsentral’no-Aziatskogo i Tikhookeanskogo poyasov. Ob”yasnitel’naya zapiska k Tektonicheskoy karte masshtaba 1 : 1 500 000. Eds.: L. P. Karsakov, Chun’tszin Chzhao, M. V. Goroshko et al. Vladivostok, Khabarovsk, DVO RAN, 2005, 264 p.

18. Tektonicheskoe rayonirovanie i strukturno-veshchestvennaya evolyutsiya Severo-Vostoka Azii. Moscow, Nauka, 1979, 240 p.

19. Black L. P., Kamo S. L. et al. TEMORA 1: a new zircon standard for U-Pb geochronology. Chemical Geology, 2003, vol. 200, pp. 155–170.

20. Chappell B. W., White A. J. R. Two contrasting granite types. Pacific Geology, 1974, vol. 8, № 2, pp. 173–174.

21. Evensen N. M., Hamilton P. J., O’Nions R. K. Rare- earth abundances in chondritic meteorites. Geochimica et Cosmo chimica Acta, 1978, vol. 42, pp. 1199–1212.

22. Frost B. R., Barnes C. G., Collins W. J., A rculus R. J., Ellis D. J., Frost C. D. A geochemical classification for granitic rocks. Journal of Petrology, 2001, vol. 42, pp. 1771– 1802.

23. Kelemen P. B., Hanghøj K., Greene A. R. One view of the geochemistry of subduction-related magmatic arcs, with an emphasis on primitive andesite and lower crust. Treatise on geochemistry. Elsevier, 2003, vol. 3, pp. 593–659.

24. Ludwig K. R. User’s manual for Isoplot / Ex, Version 2.10. A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication, 1999, no. 1a, 46 p.

25. Ludwig K. R. SQUID 1.00. A user’s manual. Berkeley Geochronology Center Special Publication, 2000, no. 2.

26. Le Maitre R. W. (ed.). A classification of igneous rocks and glossary of terms: recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks. Oxford, Blackwell, 1989, 193 p.

27. Maniar P. D., Piccoli P. M. Tectonic discrimination of granitoids. Geological Society of America Bulletin, 1989, vol. 101, no. 5, pp. 635–643.

28. Pearce J. A., Harris N. B. W., Tindle A. G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 1984, vol. 25, pp. 956–983.

29. Sun S., McDonough W. F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Magmatism in the ocean basins. Eds. A. D. Saunders, M. J. Norry. Geological Society of America Bulletin, 1989, vol. 42, pp. 313–345.

30. Williams I. S. U-Th-Pb Geochronology by Ion Microprobe: Applications of microanalytical techniques to understanding mineralizing processes. Eds. McKibben M. A., Shanks III W. C. and Ridley W. I. Reviews in Economic Geol ogy, 1998, vol. 7, pp. 1–35.