Paleoprotherozoic diorites of the Trosnyansky Massif within the Kursk Block of Sarmatia: U-Pb age, isotope systematics and sources of melts
DOI:
https://doi.org/10.17308/geology.2020.1/2517Keywords:
Kursk Block, diorite, U-Pb isotopic age, Lu-Hf systematics, sources of melts, geochemistry of zirconAbstract
Introduction: The post-collisional magmatism in East Sarmatia with an age of about 2.06 billion years is expressed by the introduction of a huge amount of magma into the crust. Within the Archean Kursk Block, granitoid massifs of type I, confined mainly to the Paleoproterozoic Tim-Yastrebovskaya rift structure are widespread. Tim-Yastrebovskaya rift structure is confined to the granulite-gneiss Paleoarchean region in the eastern part of the Kursk Block. The Paleoproterozoic Mikhailovskaya riftogenic structure is located in the Mesoarchaean granite-greenstone region, where the TTG granitoids are dominant. Only for the large diorite intrusion of Trosnyansky Massif in the Mikhailovskaya structure, there are no data on age, elemental and isotopic geochemistry, and, accordingly, its tectonic position and sources of melts. The purpose of this study was estimation of the isotopic age, the determination of the sources of melts and crystallization conditions for diorite intrusion of Trosnyansky Massif in the Paleoproterozoic Mikhailovskaya structure in the west of Kursk Block. Methodology: A petrological-geochemical and geochronological study was carried out on the diorites of the Trosnyansky Massif in the Paleoproterozoic Mikhailovskaya structure in the west of Kursk Block. Results and discussion: The obtained crystallization age of diorites of the Trosnyansky Massif of 2058 Ma corresponds to a post-collision magmatic event, widely manifested throughout Sarmatia. The distribution of rare and rare-earth elements in rocks and zircons indicates significant depths of nucleation of melts close to the stability field of garnet. Crystallization of diorite melt, in contrast, occurred at shallow depths. The Lu-Hf and Sm-Nd isotopic data for diorites indicate a long crustal history of their protoliths, which could be the rocks of the Paleoarchean core of Sarmatia. Conclusions: The Trosnyansky Diorite Massif with an age of 2058 Ma was formed during the post-collisional magmatic event (2050–2070 Ma) that took place throughout Sarmatia. Diorite magmas were formed at considerable depths in the stability field of garnet, as a result of the contamination of intraplate basites by Paleoarchean crust. Crystallization of diorite melt occurred under shallow conditions.
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Savko K. A., Samsonov A. V., Larionov A. N., Larionova Yu. O., Bazikov N. S. Palaeoproterozoic A and S-granites in the eastern Voronezh crystalline massif: geochronology, petrogenesis, and tectonic setting of origin. Petrology, 2014a, vol. 22, no. 3. pp. 205–233. DOI
Savko K.A., Samsonov A.V., Bazikov N. S., Kozlova E. N. Palaeoproterozoic granitoids of the Tim-Yastrebovskaya structure of the Voronezh Crystalline Massif: geochemistry, geochronology and melt sources. Vestnik Voronezhskogo gosudar-stvennogo universiteta. Seriya: Geologiya = Proceedings of Voronezh State University. Series: Geology, 2014b, no. 2, pp. 56–78. URL (accessed 14.02.2020). (in Russ.)
Terentiev R. A., Savko K. A. Paleoproterozoic high-Mg low-Ti gabbro-granite series in eastern Sarmatia: geochemistry and formation conditions. Russian Geology and Geophysics, 2016, vol. 57, pp. 907–932. DOI: 10.1016/j.rgg.2015.06.012
Al’bekov A. Yu., Ryborak M. V., Boiko P. S. Reference U–Pb isotope dating of Paleoproterozoic gabbroid formations of the Kursk block of the Sarmatia (Voronezh Crystalline Massif). Vestnik Voronezhskogo gosudarstvennogo universiteta. Seriya: Geologiya = Proceedings of Voronezh State University. Series: Geology, 2012, no. 2, pp. 84–94. URL (accessed 14.02.2020) (in Russ.)
Terentiev R. A., Savko K. A., Santosh M. Post-collisional two-stage magmatism in the East Sarmatian Orogen, East European Craton: evidence from the Olkhovsky ring complex. J. Geol. Soc, 2018, vol. 175, pp. 86–99. DOI: 10.1144/jgs2017- 017
Savko K. A., Samsonov A. V., Sal’nikova E. B., Kotov A. B., Larionov A. N., Korish E. H., Kovach V. P., Bazikov N. S. The Mesoarchean Tonalite-Trondhjemite-Granodiorite Associations of Eastern Sarmatia: Age and Geological Setting. Stratigraphy and Geological Correlation, 2019, vol. 27, no. 5, pp. 499–513. DOI
Savko K. A., Pilugin S. M., Novikova M. A. Mineralogy, phase equilibriums, and metamorphic conditions of Neoarchaean banded iron formations within the Tarasov anomaly. Vestnik Voronezhskogo gosudarstvennogo universiteta. Seriya: Geologiya = Proceedings of Voronezh State University. Series: Geology, 2004, no. 2, pp. 111–126. URL (accessed 14.02.2020). (in Russ.)
Shchipanskii A. A., Samsonov A. V., Petrova A. Yu., Larionova Yu. O., Geodynamics of the Eastern Margin of Sarmatia in the Paleoproterozoic. Geotectonics, 2007, vol. 41, no. 1, pp. 38–62. URL (accessed 14.02. 2020) (in Russ.)
Savko K. A., Samsonov A. V., Sal’nikova E. B., Kotov A. B., Bazikov N. S., HT/LP metamorphic zoning in the eastern Voronezh Crystalline Massif: age and parameters of metamorphism and its geodynamic environment. Petrology, 2015, vol. 23, no. 6, pp. 559–575. DOI
Savko K. A., Samsonov A. V., Kotov A. B., Sal’nikova E. B., Korish E. H., Larionov A. N., Anisimova I. V., Bazikov N. S. The Early Precambrian Metamorphic Events in Eastern Sarmatia. Precambrian Research, 2018, vol. 311, pp.1–23. DOI
Whitney D. L., Evans B. W. Abbreviations for names of rock-forming minerals. Am. Mineral., 2010, vol. 95. pp. 185–187. DOI
Larionov A. N., Andreichev V. A., Gee D. G. The Vendian alkaline igneous suite of northern Timan: ion microprobe U–Pb zircon ages of gabbros and syenite. The Neoproterozoic Timanide Orogen of Eastern Baltica. Еds. Gee D. G., Pease V. L. Geol. Soc. London Mem., 2004, vol. 30, pp. 69–74. DOI
Steiger R. H., Jager E. Subcomission of geochronology: convention of the use of decay constants in geo- and cosmochronology. Earth Planet. Sci. Lett., 1976, vol. 36, no. 2, pp. 359–362. DOI
Stacey J. S., Kramers I. D. Approximation of terrestrial lead isotope evolution by a two-stage model. Earth Planet. Sci. Lett., 1975, v. 26, no. 2, pp. 207–221. DOI
Jackson S. E., Norman J. P., William L. G., Belousova E. A. The application of laser ablation-inductively coupled plasmamass spectrometry to in situ U-Pb zircon geochronology. Chem. Geol., 2004, vol. 211, p. 47–69. DOI
Goldstein S. J., Jacobsen S. B. Nd and Sr Isotopic systematics of river water suspended material – implications for crustal evolution. Earth Planet. Sci. Lett., 1988, vol. 87, no. 3, pp. 249–266. DOI
Hoskin P. W. O., Schaltegger U. The composition of zircon and igneous and metamorphic petrogenesis. Rev. Mineral. Geochem., 2003, vol. 53, pp. 27–62. DOI
Watson E. B., Wark D. A., Thomas J. B. Crystallization thermometers for zircon and rutile. Contrib. Mineral. Petrol, 2006, vol. 151, pp. 413–433. DOI
Ferry J. M., Watson E. B. New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers. Contrib. Mineral. Petrol, 2007, vol. 154, pp. 429–437. DOI
Savko K. A., Samsonov A. V., Larionov A. N., Korish E. H., Chervyakovskaya M. V., Bazikov N. S. Episodes of the continental crust growth in the early Precambrian of Sarmatia. In «Fundamental’nye voprosy tektoniki I geodinamiki» [Fundamental issues of tectonics and geodynamics] Moscow, Publ. «GEOS». 2020, vol. 2, pp. 270–273. Available at: URL (accessed 14.02.2020) (in Russ.).
Savko K. A., Samsonov A. V., Kholina N. V., Larionov A. N., Zaitseva M. V., Korish E. H., Bazikov N. S., Terentiev R. A. 2.6 Ga high-Si rhyolites and granites in the Kursk Domain, Eastern Sarmatia: Petrology and application for the Archaean palaeocontinental correlations. Precambrian Research, 2019, vol. 322, pp. 170–192. DOI
