Geologicheskii Vestnik

Тhe results of the study of stratigraphy and conditions of occurrence of rocks of the stratotypic section of the Tulmen sub-formation are considered, and the characteristic of gabbrodolerites breaking through sedimentary rocks is also given. It is shown that the boundaries of the layers in the section are not stratigraphic, but tectonic, representing thrusts or underthrusts, which implies a stratigraphic incompleteness of the section. Gabbrodolerites of the Tulmen section are characterized by relatively low carbonate and magnesia content and high contents of TiO2, P2O5 and the sum of alkalis Na2O+K2O with a predominance of sodium over potassium. They demonstrate above-clarke concentrations of F, Cl, V, Va and below-clarke — Cr, Ni, Sr. According to petro- and geochemical features, they are close to the rocks of the Miselinsky complex of alkaline gabbroids. The obtained results on mineralogy and geochemistry of sedimentary rocks of the Tulmen section suggest that the formation of chlorite, biotite, phlogopite in them and the enrichment of rocks with fluorine by 2–7 times above clarke could be associated with the activity of postmagmatic fluids.

tyulmen sub-formation, Avzyan formation, gabbrodolerites, Miselinsky complex, alkaline gabbroids

• Alekseev A.A. (1984). Rifejsko-vendskij magmatizm zapadnogo sklona YUzhnogo Urala [Riphean-Vendian magmatism of the western slope of the Southern Urals]. Nauka Publ., Moscow, Russia, 136 p. (In Russian).
• Bekker YU.R. (1972). Osnovnye problemy stratigrafii dokembriya Russkoi platformy i ee skladchatogo obramleniya [The main problems of the Precambrian stratigraphy of the Russian Platform and its folded framing]. Sovetskaya geologiya — Soviet geology, (5), 13–23. (In Russian).
• Vojtkevich G.V, Kokin A.V., Miroshnikov A.E., Prohorov V.G. (1990). Spravochnik po geohimii [Handbook of Geochemistry]. Nedra Publ., Moscow, Russia, 476 p. (In Russian).
• Garan’ M.I. (1969). Nizhnij i srednij dokembrij. Geologiya SSSR. Permskaya, Sverdlovskaya, CHelyabinskaya i Kurganskaya oblasti. Geologicheskoe opisanie [Lower and Middle Precambrian. Geology of the USSR. Perm, Sverdlovsk, Chelyabinsk and Kurgan regions. Geological description]. Nedra Publ., Moscow, Russia, V. 12, part 1, book 1, 64–149 p. (In Russian).
• Geologiya i perspektivy neftegazonosnosti Urala [Geology and prospects of oil and gas potential of the Urals] (1988). Responsible editor B. M. Yusupov. Nauka Publ., Moscow, Russia, 240 p. (In Russian).
• Goryainova O.P., Fal’kova E.A. (1940). Geologiya Inzerskogo i Zigazino-Komarovskogo rajonov Bashkirskoj ASSR. Zigazino-Komarovskij i Inzerskij zhelezorudnye rajony Bashkirii [Geology of the Inzer and Zigazino-Komarovo districts of the Bashkir ASSR // Zigazino- Komarovo and Inzer iron ore districts of Bashkiria]. Bashgosizdat Publ., Ufa, Russia, Issue 2, 9–114 p. (In Russian).
• Knyazev YU.G. (2017). Gosudarstvennaya geologicheskaya karta Rossijskoj Federacii masshtaba 1:200 000. YUzhno-Ural’skaya seriya. Geologicheskaya karta dochetvertichnyh obrazovanij. N-40‑XVI (Inzer) [State Geological Map of the Russian Federation scale 1:200 000. South Ural series. Geological map of prequaternary formations. N-40‑XVI (Inzer)]. OAO “Bashkirgeologiya” Publ., Ufa, Russia. (In Russian).
• Knyazev YU.G., Knyazeva YU.G., Snachev V.I., Karimov T.R., Masagutov R.H., Bykova L.S., Utaev M.A., Ajdarov E.M., Alslanova E.R. (2010). Otchet o rezul’tatah rabot po ob’ektu: “Sozdanie komplekta Gosudarstvennoj geologicheskoj karty masshtaba 1:1000000 lista N-40‑Ufa” [Report on the results of work on the object: “Creation of a set of the State geological map scale 1:1000000 sheet N-40‑Ufa”]. Ufa, Russia. (In Russian).
• Kozlov V.I. (1982). Verhnij rifej i vend YUzhnogo Urala [The Upper Riphean and the Wend of the Southern Urals]. Nauka Publ., Ufa, Russia, 128 p. (In Russian).
• Kozlov V.I. (1975). Verhnij i terminal’nyj rifej Bashkirskogo Urala. Avtoreferat Kand. nauk [The upper and terminal riphean of the Bashkir Urals. Abstract of the Candidate of Sciences]. GIN AN SSSR Publ., Moscow, Russia, 22 p. (In Russian).
• Kozlov V.I. (1978). Osnovnye cherty stratigrafii verhnego dokembriya Bashkirskogo Urala. — Trudy Instituta geologii i geohimii UNC AN SSSR [The main features of the Upper Precambrian stratigraphy of the Bashkir Urals. — Proceedings of the Institute of Geology and Geochemistry of the UNC of the USSR Academy of Sciences]. Issue 133, 3–15 p. (In Russian).
• Kozlov V.I. (1986). Stratotip rifeya YUzhnogo Urala. Stratigrafiya, litologiya i geohimiya verhnego dokembriya YUzhnogo Urala i Priural’ya [Stratotype of the riphean of the Southern Urals. Stratigraphy, lithology and geochemistry of the Upper Precambrian of the Southern Urals and the Urals]. BFAN SSSR Publ., Ufa, Russia, 6–16 p. (In Russian).
• Krupenin M.T. (2020). Priural’skaya perikratonnaya vpadina v rannem i srednem rifee — nadriftovyi osadochnyi bassein s evaporitami: mineragenicheskie osobennosti [Priuralsk pericratonic depression in the early and Middle Riphean — above-drift sedimentary basin with evaporites: mineragenic features]. Ezhegodnik — Yearbook, (167). Tr. IG UrO RAN Publ., Ekaterinburg, Russia, 31–37 p. (In Russian).
• Krupenin M.T., Dub S.A. (2021). K voprosu o granitse mezo- i neoproterozoya v tipovom razreze Yuzhnogo Urala. Stratigrafiya verkhnego dokembriya: problemy i puti resheniya [On the issue of the Meso- and Neoproterozoic boundary in the typical section of the Southern Urals. Stratigraphy of the Upper Precambrian: problems and solutions]. VII Rossijskaya konferenciya po problemam geologii dokembriya. 21–24 sentyabrya 2021 g. [VII Russian Conference on the Problems of Precambrian Geology, September 21−24, 2021]. Svoe izdatel’stvo Publ., Sankt-Peterburg, 89–91. (In Russian).
• Larionov N. N., Bergazov I. R. Granovskaya N. V., Nigmatullina A. M. (2015). Gosudarstvennaya geologicheskaya karta Rossijskoj federacii. Masshtab 1:200000. Izdanie vtoroe. Seriya YUzhno-Ural’skaya. List N-40‑HKHII. Tukan. Ob’yasnitel’naya zapiska [State Geological Map of the Russian Federation. Scale 1:200000. Second edition. The South Ural series. Sheet N-40‑XXII. Toucan. Explanatory note]. MF VSEGEI Publ., Moscow, Russia.
• Maslov A.V. (2020). Razrez verkhnego dokembriya Yuzhnogo Urala i pereryvy v nem [The section of the Upper Precambrian of the Southern Urals and breaks in it]. Ezhegodnik — Yearbook, (167). Tr. IGG UrO RAN Publ., Ekaterinburg, Russia, 38–42 p. (In Russian).
• Maslov A.V., Anfimov L.V. (2000) Avzyanskaya rudonosnaya svita srednego rifeya YUzhnogo Urala (litostratigrafiya, usloviya obrazovaniya, minerageniya) [The Avzyan ore-bearing formation of the Middle Riphean of the Southern Urals (lithostratigraphy, conditions of formation, minerageny)]. Urb RAN Publ., Ekaterinburg, Russia, 132 p. (In Russian).
• Maslov A.V., Erohin E.V., Gerdes A., Ronkin YU.L., Ivanov K.S. (2018). Pervye rezul’taty U-Pb LA ICPMS-izotopnogo datirovaniya oblomochnykh tsirkonov iz arkozovykh peschanikov bir’yanskoi podsvity zil’merdakskoi svity verkhnego rifeya (Yuzhnyi Ural) [The first results of U-Pb LA-ICP-MS isotope dating of detrital zircons from arkose sandstones of the Biryan subformation of the Zilmerdak
  formation of the Upper Riphean (Southern Urals)]. Doklady Akademii nauk — Reports of the Academy of Sciences, (V. 482, No. 5), 558–561. (In Russian).
• Michurin S.V., Kalistratova E.O., Sultanova A.G., Kazbulatova G.M. (2020). Ftor v porodakh Zapadno-Aktashskoi rudnoi zony (Yuzhnyi Ural) [Fluorine in rocks of the WestAktash ore zone (Southern Urals)]. Geologicheskij vestnik — Geological Bulletin, (No. 2), 54–71. (In Russian).
• Olli A.I. (1948). Drevnie otlozheniya zapadnogo sklona Urala [Ancient deposits of the western slope of the Urals]. Saratov State University Publ., Saratov, Russia, 414 p. (In Russian).
• Polevaya N.I., Kazakov G.A. (1961). Vozrastnoe raschlenenie i korrelyatsiya drevnikh nemykh otlozhenii po otnosheniyu Ar 40 / K40 v glaukonitakh [Age-related dismemberment and correlation of ancient mute deposits with respect to Ar40 / K40 in glauconites]. Voprosy geohronologii i geologii — Questions of geochronology and Geology. AN SSSR Publ., Moscow, Leningrad, Russia, 103–122. (In Russian).
• Puchkov V.N., Sergeeva N.D., Krasnobaev A.A. (2017). Stratigraficheskaya skhema stratotipa rifeya Yuzhnogo Urala [Stratigraphic scheme of the Riphean stratotype of the Southern Urals]. Geologiya. Izvestiya Otdeleniya nauk o Zemle i prirodnyh resursov AN RB — Geologiya. Proceedings of the Department of Earth Sciences and Natural Resources of the Academy of Sciences of the Republic of Bashkortostan, (No. 23), 3–26. (In Russian).
• Rykus M.V., Snachev V.I. (2014). Geologiya i zolotonosnost’ Aktashskogo rudnogo polya [Geology and gold content of the Aktash ore field]. Neftegazovoe delo — Oil and gas business, (V. 12, No), 21–27. (In Russian).
• Stratotip rifeya. Stratigrafiya. Geohronologiya [The stratotype of Ripheus. Stratigraphy. Geochronology] (1983). Responsible editor B.M. Keller. Nauka Publ., Moscow, Russia,
  184 p. (In Russian).
• Filippov V. A. (2008). O pravomernosti vydeleniya tyul’menskoi podsvity v razreze drevnikh tolshch zapadnogo sklona Yuzhnogo Urala [On the legality of the allocation of the Tyulmen subformation in the context of ancient strata of the western slope of the Southern Urals]. Materialy 5‑go Vserossijskogo litologicheskogo soveshchaniya (Ekaterinburg, 14–16 oktyabrya 2008 g.) Tipy sedimentogeneza i litogeneza i ih evolyuciya v istorii Zemli T. 2 [Proceedings of the 5th All-Russian Lithological Meeting (Yekaterinburg, October 14–16, 2008). Types of sedimentogenesis and lithogenesis and their evolution in the history of the Earth. V. 2]. Ekaterinburg,148–150. (In Russian).
• Shvecov P.N. (1979). Bazal’nye gorizonty verkhnikh serii rifeya Yuzhnogo Urala kak otrazhenie predshestvuyushchikh epokh koroobrazovaniya [Basal horizons of the upper Riphean series of the Southern Urals as a reflection of the previous eras of mountain formation]. Doklady AN SSSR — Reports of the USSR Academy of Sciences, (V. 249. No. 1), 168–171. (In Russian).
• Bartley J.K., Khan L.C., McWilliams J. L., Stagner A.F. (2007). Carbon isotope chemostratigraphy of the Middle Riphean type section (Avzyan Formation, Southern Urals, Russia): Signal recovery in a fold-and-thrust belt // Chem. Geol., V. 273. P. 211–232.
• Cathelineau M., Nieva D. (1985). A chlorite solid solution geothermometer The Los Azufres (Mexico) geothermal system // Contrib Mineral Petrol, V. 91. P. 235–244.
• Puchkov V.N., Bogdanova S.V., Ernst R.E., Kozlov V.I., Krasnobaev A.A., Söderlund U., Wingate M. T.D., Postnikov A.V., Sergeeva N.D. (2013). The ca. 1380 Ma Mashak igneous event of the Southern Urals // Lithos. V. 174. No. 1. P. 109–124.