Analytical support of research projects at the Institute

Currently, the Center for Geodynamics and Geochronology runs three projects and participate in one additional project. Namely they are:

  1. Russian Science Foundation: Improving analytical approaches to raise reliability and time resolution of paleoclimate record in assessing the environmental changes using analytical results on lake bottom sediments (2017-2019 yy), number 17-77-10118 (head of project Pashkova G.V.).

    The analytical scheme based on a combination of X-ray methods was proposed to obtain high-resolution paleoclimatic records using data about elemental composition of bottom sediments. The techniques for analyzing the lake sediments with a minimally reasonable sample weight were developed, based on the use of: (i) wavelength dispersive X-ray fluorescence analysis (WDXRF) to obtain data on rock-forming oxides, sulfur, chlorine and carbon, (ii) total reflection X-ray fluorescence analysis (TXRF) to obtain data on trace elements, (iii) a combination of powder X-ray diffraction method (XRD) and physicochemical modeling (PCM) to obtain data on the mineral composition. Two main papers were published:

    • Pashkova G.V., Aisueva T.S., Finkelshtein A.L., Cherkashina T.Yu., Shchetnikov A.A. Quantitative approaches to the determination of elements in lake sediments by total reflection X-ray fluorescence. Microchem. J. 2018. V. 143. P. 264-271 https://www.sciencedirect.com/science/article/pii/S0026265X18305198
    • Amosova A.A., Chubarov V.M., Pashkova G.V., Finkelshtein A.L., Bezrukova E.V. Wavelength dispersive X-ray fluorescence determination of major oxides in bottom and peat sediments for paleoclimatic studies. Applied Radiation and Isotopes. 2019. V. 144, P. 118-123. https://doi.org/10.1016/j.apradiso.2018.11.004.
  2. Russian Science Foundation: A comprehensive study of archaeological materials of the Stone Age era using analytical methods for the historical reconstruction of the economic activities of the Baikal Siberia population (2019-2021 yy), number 19-78-10084 (head of project Pashkova G.V.).

    In this interdisciplinary research a complex of analytical and geochemical methods are involved to study archaeological materials for the assessment of transportation routes and cultural interconnections between people living in the Stone Age of Eastern Siberia. The data about chemical composition will be obtained using modern instrumental methods (WDXRF, TXRF, EPMA, XRD, methods of radiogenic isotopes) for archaeological materials collected in the sites Ust-Karenga I-XVI and Kovrizhka I-V, Popovsky Lug, and for unique collection of the neolithic ceramics found in the Upper Lena. It is planned the identification of the geological sources of raw materials used by ancient man to establish the mining sites and to reconstruct the manufacturing process.

  3. Russian Science Foundation: Mafic volcanism of the Siberian Craton: sources by trace element and Sr-Nd-Pb isotopes (2016 - 2020), number 16-17-10068 (head of project Ivanov A.V.). The project is devoted to Sr-Nd-Pb isotope characterization of mafic volcanic and intrusive rocks of the Siberian Craton regardless of their age. Mafic magmatism was episodic at the Siberian Craton starting from its origin in Paleoproterozoic, when few Archean blocks welded together, and continued to the Late Cenozoic. Few voluminous volcanic episodes are known through the history of the Siberian Craton. The aim of the project is to provide the Sr-Nd-Pb isotope systematics of mafic magmas erupted within the craton and to decipher the evolution of the magmatic systems. We use the class 1000 cleanroom for chemical preparation of the samples and a Finnigan MAT262 mass-spectrometer for measurements of the isotope ratios. Some main papers published:
    • Ivanov A.V., Vladykin N.V., Demonterova E.I., Gorovoy V.A., Dokuchits E.Yu. 40Ar/39Ar geochronology of the Malyy (Little) Murun Massif, Aldan Shield of the Siberian Craton: A simple story for an intricate igneous complex // Minerals. 2018. V. 8. 602. https://doi.org//10.3390/min8120602.
    • Ivanov A.V., Demonterova E.I., Savatenkov V.M., Perepelov A.B., Ryabov V.V., Shevko A.Y. Late Triassic (Carnian) lamproites from Noril'sk, polar Siberia: Evidence for melting of the recycled Archean crust and the question of lamproite source for some placer diamond deposits of the Siberian Craton // Lithos v.296-299 (2018) p. 67-78. https://doi.org/10.1016/j.lithos.2017.10.021
    • Ivanov A.V., Mukasa S.B., Kamenetsky V.S., Ackerson M., Demonterova E.I., Pokrovsky B.G., Vladykin N.V., Kolesnichenko M.V., Litasov K.D., Zedgenizov D.A. Volatile concentrations in olivine-hosted melt inclusions from meimechite and melanephelinite lavas of the Siberian Traps Large Igneous Province: Evidence for flux-related high-Ti, high-Mg magmatism // Chemical Geologyю 2018. V. 483. P. 442-462. https://doi.org/10.1016/j.chemgeo.2018.03.011