Stephan Mueller Special Publication Series www.stephan-mueller-spec-publ-ser.net 1868-4556 1868-4564 4 Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov 2009 10.5194/smsps-4-97-2009 http://www.stephan-mueller-spec-publ-ser.net/4/97/2009/ http://www.stephan-mueller-spec-publ-ser.net/4/97/2009/smsps-4-97-2009.html http://www.stephan-mueller-spec-publ-ser.net/4/97/2009/smsps-4-97-2009.pdf 97 109 2009-09-17 The Tommot pluton: a Middle Paleozoic rift-related alkaline gabbro and syenite complex, Yakutia, northeast Russia V. A. Trunilina P. W. Layer player@gi.alaska.edu L. M. Parfenov A. I. Zaitsev Y. S. Orlov Yakutian Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, 39 Lenin Prospect, 677891, Yakutsk, Russia Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA Yakutian State Geological Expedition, 13 Kirov Street, 677891, Yakutsk, Russia formaly at: Yakutian Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, 39 Lenin Prospect, 677891, Yakutsk, Russia deceased The Tommot pluton is located within the continental Omulevka terrane of the inner zone of the Verkhoyansk-Kolyma Mesozoic orogen. It is a small complex (~12 km²) composed of alkaline-ultramafic rocks, alkaline and subalkaline gabbroids, and alkaline and quartz syenites. The pluton is unique both in the composition and age of its constituent rocks. Mineralogical-petrographical and geochemical studies of the rocks indicate that the alkaline rocks resulted from the melting of depleted mantle horizons. K-Ar, Rb-Sr, and ⁴⁰Ar/³⁹Ar age determinations confirm a Paleozoic age of the rocks. Formation of the alkaline rocks is related to Middle Paleozoic rifting which occurred as two discrete events: a Late Devonian event, which affected the marginal part of the Siberian continent, and a Late Carboniferous event that reflects internal deformation of the Omulevka terrane or late-stage extension. A spatially associated alkali granite, the Somnitel'nyy pluton, is Late Jurassic–Early Cretaceous in age and is synchronous with accretion of the Kolyma-Omolon Superterrane to Siberia in the Mesozoic. Andreeva, E. D., Kononova, V. A., and Sveshnikova, E. V.: Typomorphism of the alkaline rock minerals as a mineralogical index of alkaline series. Magmatic rocks. Alkaline rocks, Nauka, Moscow, 281–305, 1984 \mbox(in Russian). Balashov, Yu. A.: Geochemistry of the REE, Nauka, Moscow, 192~pp. 1976 \mbox(in Russian). Barker, D. S. and Long, L. E.: Feldspatoidal syenite in a quartz diabase sill, Breokville, New Jersey, J. Petrol., 10, 202–221, 1969. Batchelor, R. A. and Bowden, P.: Petrographic interpretation of granitoid rock series using multicationic parameters, Chem. Geol., 48, 43–55, 1985. Borodin, L. S.: Petrochemistry of magmatic series. Nauka, Moscow, 241~pp., 1987 \mbox(in Russian). Brown, G. G. and Parsons, J.: Calorimetric and phase-diagram approaches to two-feldspar geothermometry: a critique, Am. Mineral., 70(3–4), 356–361, 1985. Bushlyakov, I. N. and Kholodnov, V. V.: Halogens in the petrogenesis of granitoids, Nauka, Moscow, 192~pp., 1986 \mbox(in Russian). Bogatikov, O. A., Mikhailov, N. P., and Gon'shakova, V. I. (Eds.): Classification and nomenclature of the magmatic rock, Nedra, Moscow, 159~pp., 1981, \mbox(in Russian). Dorofeev, A. V.: Geologic map of the USSR at 1:200 000 scale. Sheets R-54-XXVII, XXVIII, Aerogeology, Nedra, Moscow, 62~pp., 1967 \mbox(in Russian). Entin, A. R., Biryukov, V. M., and Zaitsev, A. I.: On the age of ultrabasic-alkaline rocks and carbonatites of the Gornoozerskiy and Povorotnyy massifs (Sette-Daban, Yakutia), Geol. Geofiz., 7, 57–66, 1991 \mbox(in Russian). Entin, A. R., Zaitsev, A. I., and Nenashev, N. I.: On the sequence of geologic events related to the emplacement of the Tomtor massif ultrabasic-alkaline rocks and carbonatites. Geol. Geofiz., 12, 42–51, 1990 \mbox(in Russian). Kovalenko, V. I.: Petrology and geochemistry of the rare-metal granitoids. Nauka, Novosibirsk, 173~pp., 1977 \mbox(in Russian). Kononova, V. A. (Ed.): Causes of diversity and problems in the genesis of alkaline, in: Magmatic rocks, Alkaline rocks, Nauka, Moscow, 306–380, 1984, \mbox(in Russian). Kuznetsov, Yu. A.: Main types of magmatic formations, Nauka, Moscow, 387~pp., 1964 \mbox(in Russian). Kuz'min, M. I.: Geochemistry of magmatic rocks of Phanerozoic foldbelts, Nauka, Novosibirsk, 199~pp., 1985 \mbox(in Russian). Layer, P. W., Newberry, R., Fujita, K., Parfenov, L., Trunilina, V., and Bakharev, A.: Tectonic setting of the plutonic belts of Yakutia, Northeast Russia, based on $^40$Ar/$^39$Ar geochronology and trace element geochemistry, Geology, 29, 167–170, 2001. Laz'ko, Ye. Ye.: Typomorphism of ultramafic rock-forming minerals, in: Ultrabasic rocks, edited by: Laz'ko, Ye. Ye., and Sharkov, Ye. V., Nauka, Moscow, 424–441, 1988, \mbox(in Russian). Ludwig, K. R.: User's manual for Isoplot 3.00 A geochronological toolkit for Microsoft Excel, Berkeley Geochronology Center Special Publication 4, 70~pp., 2003. Nekrasov, I. Ya.: Magmatism and ore-bearing capacity of northeastern Verkhoyansk-Chukotka folded area, Izd-vo AN SSSR, Moscow, 334~pp., 1962 \mbox(in Russian). Neustroev, A. P., Parfenov, L. M., and Rodinov, V. P.: Paleomagnetic data and the nature of the Tas-Khayakhtakh terrane (Verkhoyansk region), Geol. Geofiz., 8, 25–37, 1993 \mbox(in Russian). Nokleberg, W. J., Bundtzen, T. K., Eremin, R. A., Ratkin, V. V., Dawson, K. M., Shpikerman, V. I., Goryachev, N. A., Byalobzhesky, S. G., Frolov, Y. F., Khanchuk, A. I., Koch, R. D., Monger, J. W. H., Pozdeev, A.I., Rozenblum, I. S., Rodionov, S. M., Parfenov, L. M., Scotese, C. R., and Siderov, A. A.: Metallogenesis and tectonics of the Russian Far East, Alaska, and the Canadian Cordillera, US Geological Survey Professional paper, 1697, 397~pp., 2005. Parfenov, L. M.: Continental margins and island arcs of the Mesozoides of northeast Asia, Nauka, Novosibirsk, 189~pp., 1984 \mbox(in Russian). Parfenov, L. M.: Tectonics of the Verkhoyansk-Kolyma Mesozoides in the context of plate tectonics, Tectonophysics, 199, 319–342, 1991. Parfenov, L. M.: Accretion history of northeast Asia, in: Proceedings of the First International Conference on Arctic Margins, edited by: Thurston, D. and Fujita, K., US Minerals Management Service, Anchorage, 83–188, 1994. Pearce, J. A.: Trace element characteristics of lavas from destructive plate boundaries, in: Andesites, R. S. Thorpe (Editor), Wiley, Chichester, 525–548, 1982. Perchuk, L. L.: Equilibria of the rock-forming minerals, Nauka, Moscow, 387~pp., 1970 \mbox(in Russian). Perchuk, L. L.: Pyroxene barometer and pyroxene geotherms, Dokl. Akad. Nauk SSSR+, 233(6), 1196–1199, 1977 \mbox(in Russian). Philpots, A. R.: The Monterigian Province, in: The Alkaline Rocks, edited by: Sorensen, H., Wiley, London, 293–311, 1974. Proshchenko, E. G. and Nenashev, N. I.: Geological interpretation of the radiogenic age of the rocks of the Tommot complex gabbro-syenite intrusion, Izv. AN SSSR Geol.+, 12, 26–32, 1969 \mbox(in Russian). Sorensen, H. (Ed.): Origin of the alkaline rocks – a summary and retrospect, in: The Alkaline Rocks, Wiley, London, 535–542, 1974. Steiger, R. H. and Jaeger, E.: Subcommission on geochronology: Convention on the use of decay constants in geo and cosmochronology, Earth Planet. Sc. Lett., 36, 359–362, 1977. Stone, D. B.: Paleomagnetic Paleolatitudes for Northeast Russia: an Update, in: Origin of Northeast Russia: Paleomagnetism, Geology & Tectonics, University of Alaska Geophysical Institute Report UAG-R-330 (CD and http://www.gi.alaska.edu/nerussia), 2006 Thornton, C. P. and Tuttle, O. F.: Chemistry of igneous rocks, differentiation index, Am. J. Sci., 258(11), 664–684, 1960. Troshin, Yu. P. , Grebenschikova, V. T., and Antonov, A. Yu.: Volatile components in biotites and metallogenic specialization of intrusions. Mineralogical criteria for evaluation of the content, Nauka, Leningrad, 73–83, 1981 \mbox(in Russian). Upton, B. G. J.: The alkaline province of southwest Greenland, in: The Alkaline Rocks, edited by: Sorensen, H., Wiley, London, 221–238, 1974. Yoder, H. S. and Tilley, C. P.: Origin of basalt magmas, an experimental study of natural and synthetic rocks systems, J. Petrol., 3, 342–532, 1962. Wones, D. R. and Eugster, H. P.: Stability of biotite: experiment, theory and application. Am. Mineral., 9, 1228–1272, 1965.