The Ust’-Belaya mafic-ultramafic massif is assigned to the Western Koryak fold belt and largely composed of residual spinel peridotites, layered spinel and plagioclase peridotites, and gabbros. These rocks are crosscut by occasional plagiogranite and diorite veins and exhibit locally a close spatial association with basalts and carbonate-sedimentary deposits of Late Devonian and Early Carboniferous age. Based on this evidence, the massif was ascribed to the pre-Late Devonian ophiolite association. Our study presents new U-Pb SHPIMP II zircon ages and petrographic and mineralogical data on samples of the layered amphibole gabbro and vein diorite from the Ust’-Belaya massif. The approximate concordant U-Pb age corresponding to a timing of of amphibole gabbro crystallization is 799 ± 15 Ma, and the concordant U-Pb age reflecting a timing of of vein diorite crystallization is 575 ± 10 Ma. These ages coupled with geological studies of the massif, petrological and mineralogical investigations of the dated samples, as well as literature data on the petrology of peridotites and the age of formed plagiogranites suggest that the peridotites and layered gabbros of the Ust’-Belaya massif were formed by the Late Riphean, whereas the vein diorite and plagiogranite were resulted from a later (Vendian-Cambrian) magmatic stage. The peridotites and gabbros of the massif display no genetic relationship with spatially associated basalts and sedimentary rocks and, thus, they cannot be considered as members the pre-Late Devonian ophiolitic association. The results of this study will inevitably lead to a significant revision of geological and geodynamic interpretations of the Ust’-Belaya mafic-ultramafic massif. However, uneven study of the Precambrian complexes of the Koryak and Chukchi areas, their evolution in different structures of the region cannot yet be described by a single geodynamic scenario.
This is a preview of subscription content,to check access.
Access this article
Similar content being viewed by others
L. M. Parfenov, L. M. Natapov, S. D. Sokolov, and N. V. Tsukanov, “Terranes Analysis and Accretion in Northeast Asia,” The Island Arc 2, 35–54 (1993).
L. M. Parfenov, G. Badarch, N. A. Berzin, et al., “Summary of Northeast Asia Geodynamics and Tectonics,” in Geology, Geophysics and Tectonics of Northeastern Russia: A Tribute to Leonid Parfenov, Ed. by D. B. Stone, K. Fujita, P. W. Layer, E. Miller, A. V. Prokopiev, and J. Toro, Steph. Mueller Sp. Publ. Ser., London, 4, 11–33 (2009).
W. J. Nokleberg, L. M. Parfenov, J. W. H. Monger, et al., “Circum-North Pacific Tectonostratigraphic Terrane Map, Scale 1: 5000000,” U.S. Geol. Surv., Open File Rept., 94–714 (1994).
S. A. Palandzjan, “Ophiolite Belts in the Koryak Upland, Northeast Russia,” Tectonophysics 127, 341–360 (1986).
S. A. Palandzhyan and G. G. Dmitrenko, “Ophiolitic Complexes and Associated Rocks in the Ust-Belaya Mountains and Algan Ridge, Russian Far East,” U.S. Geological Survey, Open File Report OF, 92-20-I, 1–6 (1996).
G. E. Nekrasov, N. B. Zaborskaya, and S. M. Lyapunov, “Pre-Late Paleozoic Ophiolites in the Western Koryak Highland: Fragments of an Oceanic Plateau,” Geotectonics 35, 114–133 (2001).
S. D. Sokolov, M. V. Luchitskaya, S. A. Silantyev, et al., Ophiolites in Accretionary Complexes along the Early Cretaceous Margin of NE Asia: Age, Composition, and Geodynamic Diversity, in Ophiolites in Earth History, Ed. by Y. Dilek and P. T. Robertson, Geol. Soc. Spec. Publ., London 218, 619–664 (2003).
B. A. Bazylev, G. V. Ledneva, N. N. Kononkova, et al., “Typification of Peridotites of the Ust Bel’skii Massif (Chukotka) from Mineral Compositions: Preliminary Data,” in Ultramafic-Mafic Complexes of Fold Systems and Related Deposits. Proceedings of 3rd International Conference, Yekaterinbburg, Russia, 2009 (Inst. Geol. Geokhim. UrO RAN, Yekaterinburg, 2009), Vol. 1, pp. 73–76 [in Russian].
A. A. Aleksandrov, Nappe and Imbricated Structures in the Koryak Highland (Nauka, Moscow, 1978) [in Russian].
A. V. Aristov, S. D. Sokolov, A. V. Moiseev, and Ya. Khayasaka, “New Data on the Age of Sedimentary Cober of Ophiolites of the Otrozhnenskaya Nappe of the Ust-Bel’sk Terrane,” in Proceedings of 42th Tectonic Conference (GEOS, Moscow, 2009), Vol. 1, pp. 21–23 [in Russian].
M. S. Markov, G. E. Nekrasov, and S. A. Palandzhyan, “Ophiolites and Melanocratic Basement of the Koryak Highland,” in Sketches on the Tectonics of the Koryak Highland (Nauka, Moscow, 1982), pp. 30–70 [in Russian].
S. D. Sokolov, “Accretionary Tectonics: Conceptual Base, Problems and Prospects,” in Problems of Global Geodynamics. Proceedings of Theoretical Seminar of OGGGGN RAN 2000-2001, Ed. by D. V. Rundqvist (RAN, Moscow, 2003), Vol. 2, pp. 32–56 [in Russian].
I. S. Williams, “U-Th-Pb Geochronology by Ion Microprobe,” in Applications of Microanalytical Techniques to Understanding Mineralizing Processes, Ed. by M. A. McKibben, W. C. Shanks III, and W. I. Ridley, Rev. Econ. Geol. 7, 1–35 (1998).
K. R. Ludwig, SQUID 1.00, A User’s Manual (Geochronology Center Special Publication, Berkeley, 2000).
L. P. Black, S. L. Kamo, C. M. Allen, et al., “TEMORA 1: A New Zircon Standard for U-Pb Geochronology,” Chem. Geol. 200(1–2), 155–170 (2003).
G. W. Wetherill, “Discordant Uranium-Lead Ages,” Trans. Am. Geophys. Union 37, 320–326 (1956).
K. R. Ludwig, User’s Manual for Isoplot/Ex, Version 2.10, A Geochronological Toolkit for Microsoft Excel (Geochronology Center Special Publication, Berkeley, 1999).
D. Rubatto, “Zircon Trace Element Geochemistry: Partitioning with Garnet and the Link between U-Pb Ages and Metamorphism,” Chem. Geol. 184(1), 123–138 (2002).
P. W. O. Hoskin and L. P. Black, “Metamorphic Zircon Formation by Solid-State Recrystallization of Protolith Igneous Zircon,” J. Metamorph. Geol. 18(4), 423–439 (2000).
M. W. Schmidt, “Amphibole Composition in Tonalite as a Function of Pressure: An Experimental Calibration of the Al-in-Hornblende Barometer,” Contrib. Mineral. Petrol. 110(2–3), 304–310 (1992).
T. Holland and J. Blundy, “Non-Ideal Interactions in Calcic Amphiboles and Their Bearing on Amphibole-Plagioclase Thermometry,” Contrib. Mineral. Petrol. 116 (4), 433–447 (1994).
A. B. Thompson, Metamorphism and Fluids, in Understanding the Earth, Ed. by G. C. Brown, C. J. Hawkesworth, and R. C. L. Wilson (Cambridge Univ. Press, Cambridge, 1992), pp. 222–248.
K. Lehnert, Y. Su, C. Langmuir, et al., “A Global Geochemical Database Structure for Rocks,” Geochem. Geophy. Geosyst. 1 (2000). Doi:10.1029/ 1999GC000026, http:/www.petdb.org.
B. Sarbas, “The GEOROC Database as a Part of Growing Geoinformatics Network,” in Geoinformatics 2008-Data to Knowledge. Proceedings, Ed. by S.R.F. Brady, A.K. Sinha, and L.C. Gundersen, U.S. Geol. Surv. Sci. Investigations Rept., 2008–5172 (2008).
A. V. Moiseev, S. D. Sokolov, and Ya. Khayasaka, “Geochemical Characteristics of the Voclanic Rocks of the Otrozhnenskaya Nappe, Ust Bel’sk Mount,” in Tectonics and Geodynamics of Fold Belts and Phanerozoic Platforms of 43rd Tectonic Conference, Moscow, 2010 (GEOS, Moscow, 2010), Vol. 2, pp. 59–64 [in Russian].
V. E. Khain, Tectonics of Continents and Oceans, Year 2000 (Nauchnyi Mir, Moscow, 2001) [in Russian].
Z. X. Li, S. V. Bogdanova, A. S. Collins, et al., “Assembly, Configuration, and Break-Up History of Rodinia: A Synthesis,” Precambrian Res. 160, 179–210 (2008).
P. L. Tikhomirov, “Age of Plagiogranite from the Ust-Belaya Ophiolite Complex (Western Koryak Folded Zone): Evidence from SHRIMP U-Pb Dating of Zircons,” Dokl. Earth Sci. 434(5), 1362–1365 (2010).
Y. Hayasaka, A. V. Moiseev, S. D. Sokolov, et al., “Methodology and Philosophy for Detrital Zircon Chronology Using EPMA, LA-ICP-MS, and SHRIMP, and Outline of Results for the Paleozoic to Mesozoic Complex in the Ust’-Belaya Range, West Koryak Thrust and Fold Belt, Far East Russia,” in Abstracts of the Russian-Japanese Workshop Symposium “Ophiolites and Related Complexes: Significance for Geodynamic Interpretations,” Moscow, Russia, 2010 (GIN RAS, Moscow, 2010), p. 11.
G. E. Nekrasov and A. F. Makeev, “The U-Pb Zircon Age of Plagiogranite from the Plagiogranite-Amphibolite Complex of the Ganychalan Block, the Western Koryak Highland,” Dokl. Earth Sci. 390, 547–576 (2003).
B. A. Bazylev, G. V. Ledneva, N. N. Kononkova, and A. Ishiwatari, “Subduction-Reworked Subcontinental Lithospheric Mantle: An Example from Peridotites and Plutonic Rocks of the Ust’-Belaya Massif (Chukotka),” in Abstracts of the Russian-Japanese Workshop Symposium “Ophiolites and Related Complexes: Significance for Geodynamic Interpretations,” Moscow, Russia, 2010, (GIN RAS, Moscow, 2010), pp. 3–4.
Original Russian Text © G.V. Ledneva, B.A. Bazylev, V.V. Lebedev, N.N. Kononkova, A. Ishiwatari, 2012, published in Geokhimiya, 2012, Vol. 50, No. 1, pp. 48–59.
About this article
Cite this article
Ledneva, G.V., Bazylev, B.A., Lebedev, V.V. et al. U-Pb zircon age of gabbroids of the Ust’-Belaya mafic-ultramafic massif (Chukotka) and its interpretation. Geochem. Int. 50, 44–53 (2012). https://doi.org/10.1134/S0016702912010077