Main results
The main objective of the laboratory is the study of the isotope-geochemical features of sedimentary and magmatic complexes of the southern Urals and East of the Russian platform with the aim of reconstruction of the conditions of their formation and geological history, as well as performing chemical analysis for the staff of the Institute of Geology and third party organizations.
- New geochronological data were obtained by Rb-Sr method on many benchmark magmatic complexes (Akhmerovo granite, Navysh and Kipchak trachybasalt, etc.). In the sedimentary complexes of the problematic age within the Kama-Belsky aulacogen shale were dated on the whole rock in the basic wells sections: 1 Sarapul (1456+/-144 million years) and Vostochno-Askinskaya 1 (1554+/ — 350 million years), which is interpreted as the time of occurrence of epigenetic processes in shale formations and confirms their Lower Riphean age.
- In the laboratory the method of studying the isotopic composition of sulfur, including sulfur in sulfates was revived. Interesting results are obtained for the fundamental problem of the evolution of the global geochemical sulfur cycle that is associated with the change in the composition of the hydrosphere and atmosphere in geological history (sulfates and sulfides from the Lower Riphean deposits in the Kama-Belsky aulacogen and the Bashkirian anticlinorium with the age of 1.6 million billion years, the Yatulian sediments in the Onega basin with the age of 2.2 billion years, the Kungurian evaporites of 0.24 billion years were studied). In particular, the study of variations of d34S in sulfate from the Lower — Middle Riphean deposits shows very minor differences from modern sulfate sea water that indicates the consistency of salt and isotopic composition of the waters of the world ocean not only during the Phanerozoic, but also during more ancient time. In the Lower Riphean strata of the southern Urals the former presence of sedimentary sulfates are also recorded by the presence of epigenetic pyrites and barites with a heavy sulfur (d34S reaches +41,4 ‰). The study of isotopic composition of sulfur in magnesite of Satka Deposit confirmed the model of formation of the magnesite deposits in epigenetic evaporate brines.
- Isotope-geochemical markers have been identified for the South Ural paleoglaciogenical level of the Neoproterozoic. The nature of this level is a discussion, so any new data on the isotope composition of carbon in the alleged cap-carbonates or sulphur in synsedimentary sulphides contribute to the understanding of their genesis. Additional study of lithological features of the problematic sediments in the Tolparovo, Muradymovo sections revealed signs of possible glacio-marine genesis; they were deposited under conditions of rising sea level in circumstances from oxidative to reductive, and form a single transgressive cycle between the typical sediments of the upper Riphean and the Asha series of the Vendian. Their further study will allow to correlate them with the known glaciohorizons in the other regions of the world.
- Studying the isotope-geochemical features of ore objects has both fundamental and applied importance. For gold occurrences in the Precambrian strata of the Bashkirian anticlinorium (Ulyukbar, Gorny Priisk etc.) and areas of the Main Uralian Fault Zone a large amount of mineralogical, isotopic, geochemical, thermobarometric data necessary for understanding their genesis, and to search for ore deposits are received.
The obtaining of isotope-geochemical characteristics of deposits and occurrences of magnesite (Ismakaevo and Bagryashka) and fluorite (Suran) in the Mashak Graben of the Bashkirian Meganticlinoriun showed that they are associated with a single process of fluid generation. The source of the fluids was from buried evaporite brines that have experienced intensive interaction with the sedimentary and volcanic rocks in the tectonically active zone of the Graben.
The laboratory staff participated in the Programs of fundamental research of RAS DHS-8 (2007-2008) and DHS-4 (2009-2011) and has also been, and are currently implementing numerous (more than 10) of RFBR grants.
The laboratory staff perform a large volume of research on the orders of industrial organizations — OOO Gazprom dobycha Orenburg, CJSC Ingeokholding, OOO Gazpromneft-NTC, CJSC Neftekom, JSC Volgo-Uralnephtegaz, JSC Of, OOO «Mining company Suran», etc.