T.S.Zaitseva graduated from Department of Geochemistry of Geology Faculty of Saint-Petersburg State University in 1994. Later (2003) she obtained a PhD degree in Geology and Mineralogy. Thesis: “Mineralogical and geochemical peculiarities of ore-forming chromspinellides of the Imandrovsky layered intrusion (the Kola Peninsula)”.
Since 1998, she has been working at the IPGG RAS in the Laboratory of Isotope Chemostratigraphy and Geochronology of Sedimentary Rocks. Together with laboratory team (I.M. Gorohov, N.N. Melnikov, E.P. Kutyavin, O.V. Yakovleva, T.L. Turchenko, G.V. Konstantinova, A.B. Kuznetsov, G.V. Ovchinnikova and O.K. Kaurova) she studies the isotope geochemistry and geochronology of non-metamorphosed sedimentary rocks of the Proterozoic. Their studies take two paths: (i) isotope geochronology and (ii) chemostratigraphy. In these fields, stratigraphic and isotopic investigations combine with exhaustive mineralogical and chrystallochemical studies of lithogenetic evolution of sedimentary material. One of the approaches is based on a study of mixing systematics of the non-cogenetic components of shale and includes separation and analysis of a set of the submicron clay fractions varied in size, together with the employment of the leaching technique and the XRD and TEM controls of illite evolution. In many cases, the approach makes it possible to determine the timing of the diagenesis and catagenesis of clayey sediments by the analysis of a single shale sample.
The investigation of globular phyllosilicates of the glauconite‒illite series (GPS) includes complex mineralogical, geochemical, structural and isotopic‒geochronological study. Isotopic dating of GPS is carried out in combination with simulation of the distribution of octahedral cations and comparison of the results obtained with Mössbauer and IR spectrometry data. The applied approach is based on an assumption that the formation and transformation of Rb‒Sr and K‒Ar systems in GPS are synchronous with stages in their structural evolution, which are determined by the geological and geochemical processes during depositional history. Such an approach combined with the mineralogical and structural analysis contributes to correct interpretation of stratigraphic significance of isotopic data.