PALEOECOLOGICAL RECONSTRUCTIONS IN THE UPPER JURASSIC SEDIMENTARY BASIN OF WEST AND CENTRAL SIBERIA RESULTING FROM LITHOBIOCHEMICAL AND SPECTRAL METHODS OF ANALYSIS

A. A. Zlobin1, V. I. Moskvin2, O. N. Zlobina2

1Novosibirsk State University, Novosibirsk; 2A. A. Trofimuk Institute of Oil and Gas Geology and Geophysics, Novosibirsk

The paper presents some results of detailed lithological and biochemical analyses of Upper-Jurassic deposits in West and Central Siberia. Studying the morphology of kerogen inclusions with the help of the scanning electronic microscope, data of microprobe chemical and mass and spectrometer (ICP-MS method) analyses have allowed to identify groups of organisms (red algae, tunicates, radiolarias) which weren’t defined earlier in a fossil state. An interrelation of mineral forms of bromine, zinc, barium and strontium with primary biogenous complexes is established. It is supposed that some of radiolaria taxons used compounds of barium of the Ba [Pt(CN)4] type in the incrustation of their covers to create a protective mechanism from radioactive radiation. A direct or close to it relationship between a barium amount and uranium concentration is established. It is broken in case of high (up to abnormal) values of both elements, which is characteristic of the sections drilled in close to granite massifs or in the zones of active geodynamic regime.

Key words: Upper Jurassic, Western and Central Siberia, biogenic mineral complexes, spectral analysis, paleoecological reconstructions.

DOI 10.20403/2078-0575-2016-4-29-40