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New data on the Mesozoic magmatism of the Bechasyn zone, in the Greater Caucasus, and estimation of the age of the regional metamorphism

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Abstract

The results of the local U–Th–Pb isotope dating of accessory zircons from gabbroic rocks of the Khasaut subvolcanic complex are considered. Dikes of gabbroic rocks, which were previously mapped as subvolcanic intrusions in the structure of the Precambrian metamorphic complex, were studied in the Bechasyn zone of the crystallinicum of the Greater Caucasus, in the riverbed of the Khasaut River (the left tributary of the Malka River). The U–Pb age of igneous zircons from these rocks of ~220 Ma does not support the Proterozoic age and is evidence of possible manifestation of Triassic magmatism in the Greater Caucasus. The recent data on the zircon age of the protolith of the Bechasyn complex indicate that some sedimentary rocks are younger than 440 Ma and the peak of regional metamorphism of greenschist facies in the Bechasyn zone, taking the thermochronological corrections into account, probably corresponded to 400–420 Ma.

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References

  • Baranov, G.I. and Kropachev, S.M., Stratigraphy, magmatism, and tectonics of the Greater Caucasus: Precambrian and Paleozoic stages, in Geologiya Bol’shogo Kavkaza (Geology of the Greater Caucasus), Moscow: Nedra, 1976, pp. 45–154.

    Google Scholar 

  • Baranov, G.I., Problems of geological structure of pre-Middle Paleozoic basement of the Greater Caucasus, in Geologiya i poleznye iskopaemye Bol’shogo Kavkaza (Geology of Mineral Resources of the Greater Caucasus), Moscow: Nauka, 1987, pp. 106–111.

    Google Scholar 

  • Berger, G.W. and York, D., Geothermometry from 40Ar/39Ar dating experiments, Geochim. Cosmochim. Acta, 1981, vol. 45, pp. 795–811.

    Article  Google Scholar 

  • Black, L.P., et al., TEMORA 1: A new zircon standard for U–Pb geochronology, Chem. Geol., 2003, vol. 200, pp. 155–170.

    Article  Google Scholar 

  • Borsuk, A.M., Mezozoiskie i kainozoiskie magmaticheskie formatsii Bol’shogo Kavkaza (Mesozoic and Cenozoic Magmatic Formation of the Greater Caucasus), Moscow: Nauka, 1979.

    Google Scholar 

  • Dodson, M.H., Closure temperature in cooling geochronological and petrological systems, Contrib. Mineral. Petrol., 1973, vol. 40, no. 3, pp. 259–274.

    Article  Google Scholar 

  • Gerasimov, A.P., About the age of ancient formations of the North Caucasus, Izv. Geol. Kom., 1929, vol. 48, no. 7, pp. 919–929.

    Google Scholar 

  • Gerasimov, V.Yu. and Savko, K.A., Geospeedometry and thermal evolution of garnet-cordierite metapelites of the Voronezh massif, Petrology, 1995, vol. 3, no. 6, pp. 563–577.

    Google Scholar 

  • Gerasimov, V.Yu., Karpenko, M.I., Ivanenko, V.V., and Rastas, J.T., Cooling rate in the contact aureole of a rapakivi massif and thermochronology, Terra Nova, 1997, vol. 9, pp. 69–70.

    Google Scholar 

  • Gerasimov, V.Yu., Savko, K.A., Lebedev, V.A., and Arakelyants, M.M., A thermochronological approach to the age determination of gneisses from the Voronezh Crystalline Massif (VCM) with 40Ar/39Ar laser probe method, Vestn. Voronezh State Univ., Ser. Geol., 1998, no. 5, pp. 59–61.

    Google Scholar 

  • Gerasimov, V. Yu., Lebedev, V.A., Arakelyants, M.M., and Pis’mennyi, A.N., Thermochronological modeling of the metamorphism age of andalusite schists of the Caucasus, in Tez. XVII simpoziuma po geokhimii izotopov imeni A.P. Vinogradova (Proc. XVII A.P. Vinogradov Symp. on the Isotope Geochemistry), Moscow, 2004, pp. 61–62.

    Google Scholar 

  • Gerasimov, V.Yu., Pis’mennyi, A.N., and Enna, N.L., The study of zircons from the crystalline basement of the Greater Caucasus, in Magmatizm i metamorfizm v istorii Zemli. Mat-ly XIVseross. Petrogr. Soveshch. T. 1 (Proc. XI All-Russ. Petrogr. Cof. “Magmatism and Metamorphism in the Earth’s History”. Vol. 1), Yekaterinburg: IGG UBr RAS, 2010, pp. 167–168.

    Google Scholar 

  • Kizeval’ter, D.S., Stratigraphic subdivision of metamorphic strata of the Central Caucasus, in Mat-ly po geologii i metallogenii Tsentral’nogo i Zapadnogo Kavkaza. Tr. Kavkazskoi ekspeditsii VAGT i MGU. T. 2 (Proc. Caucasus Exped. VAGT and MSU “Materials on Geology and Metallogeny of the Central and West Caucasus”. Vol. 2), Moscow: Gostekhizdat, 1960, pp. 67–116.

    Google Scholar 

  • Krasivskaya, I.S., New data about metamorphic schists from the middle reaches of the Malka River, Dokl. Akad. Nauk SSSR, 1961, vol. 138, no. 3, pp. 906–909.

    Google Scholar 

  • Lee, J.K.W., et al., Pb, U and Th diffusion in natural zircon, Nature, 1997, vol. 390, pp 159–162.

    Article  Google Scholar 

  • Ludwig, K.R., User’s Manual for Isoplot/Ex, Vers. 2.10. A Geochronological Toolkit for Microsoft Excel, Berkeley Geochronol. Center Spec. Publ., 1999, no. 1a.

  • Ludwig, K.R., SQUID 1.00. A User’s Manual, Berkeley Geochronol. Center Spec. Publ., 2000, no. 2.

  • Middelemost, E.A.K., Magmas and Magmatic Rocks. An Introduction to Igneous Petrology, London, N.Y.: Longman, 1985.

    Google Scholar 

  • Philippot, P., Perchuk, A.L., Blichert-Toft, J., et al., Lu–Hf and Ar–Ar geochronology confirms extreme rate of subduction zone metamorphism deduced from geospeedometry, Tectonophysics, 2001, vol. 342, pp. 23–38.

    Google Scholar 

  • Pis’mennyi, A.N., Gosudarstvennaya geologicheskaya karta Rossiiskoi Federatsii masshtaba 1: 200000. Listy K-38I-VII (Kislovodsk). Prilozhenie 1 (The 1: 200000 State Geological Map of the Russian Federation. Sheet K38-I-VII (Kislovodsk). Annex 1), Yessentuki: FGUGP “Kavkazgeos"emka”, 2005.

    Google Scholar 

  • Potapenko, Yu.Ya., Tectonics of the Bechasyn Zone, in Geologiya SSSR. T, 9. Ch. 1 (Geology of the USSR. Vol. 9. Pt. 1), Moscow: Nedra, 1968, pp. 618–621.

    Google Scholar 

  • Potapenko, Yu.Ya., Stratigrafiya i struktura dodevonskikh kompleksov Severnogo Kavkaza (Stratigraphy and Structure of pre-Devonian Complexes of the Western Caucasus), Tbilisi: KIMS, 1982.

    Google Scholar 

  • Potapenko, Yu.Ya., Bechasyn Zone. The Bechasyn metamorphic complexes, in Petrologiya metamorficheskikh kompleksov Bol’shogo Kavkaza (Petrology of Metamorphic Complexes of the Greater Caucasus), Moscow: Nauka, 1991, pp. 9–18.

    Google Scholar 

  • Potapenko, Yu.Ya., Geologiya Karachaevo-Cherkesii (The Geology of the Karachaevo-Cherkessia), Karachaevsk: KChGU, 2004, vol. 153.

  • Shengelia, D.M., Korikovskii, S.P., Chichinadze, G.L., et al., Petrologiya metamorficheskikh kompleksov Bol’shogo Kavkaza (Petrology of Metamorphic Complexes of the Greater Caucasus), Moscow: Nauka, 1991.

    Google Scholar 

  • Snezhko, V.A., Riphean stratified formations of the Karachaevo-Cherkess Zone of the Central Caucasus, Region. Geol. Metallogen., 2005, no. 25, pp. 87–94.

    Google Scholar 

  • Somin, M.L., Pre-Jurassic basement of the Greater Caucasus: Brief overview, Turkish J. Earth Sci., 2011, vol. 20, pp. 545–610.

    Google Scholar 

  • Williams, I.S., U–Th–Pb geochronology by ion microprobe, Rev. Econ. Geol. (Application of Microanalytical Techniques to Understanding Mineralizing Processes), 1998, vol. 7, pp. 1–35.

    Google Scholar 

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, Moscow, Russia

    V. Yu. Gerasimov

  2. Department of Geology, Moscow State University, Moscow, Russia

    V. K. Garanin

  3. OAO Kavkazgeols’emka, Yessentuki, Russia

    A. N. Pis’mennyi & N. L. Enna

Authors
  1. V. Yu. Gerasimov
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  2. V. K. Garanin
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  3. A. N. Pis’mennyi
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  4. N. L. Enna
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Corresponding author

Correspondence to V. Yu. Gerasimov.

Additional information

Original Russian Text © V.Yu. Gerasimov, V.K. Garanin, A.N. Pis’mennyi, N.L. Enna, 2015, published in Vestnik Moskovskogo Universiteta. Geologiya, 2015, No. 4, pp. 62–73.

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Gerasimov, V.Y., Garanin, V.K., Pis’mennyi, A.N. et al. New data on the Mesozoic magmatism of the Bechasyn zone, in the Greater Caucasus, and estimation of the age of the regional metamorphism. Moscow Univ. Geol. Bull. 70, 327–337 (2015). https://doi.org/10.3103/S0145875215040031

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