Boreskov

OP‐21The manifestation of this geochemically enriched magmatism was correlated with thefirst finds of eucaryotic heterotrophic organisms at ~ 2 Ga, for example in the black shalesand phosphorites of the Paleoproterozoic Pechenga complex, Kola Peninsula [7]. Forinstance, a significant increase in amount of spheromorphides and remains of filamentousalgae is observed in the Upper Jatulian deposits (~ 2.0 Ga) of Karelia [1]. The vital activity ofthe organisms significantly increased the oxygen content in atmosphere, which was markedby the formation of cupriferous red beds at all Precambrian shields, generation of the firsthydrocarbon deposits (shungites, Karelian craton), rock‐salt in Karelia [6], and phosphoriteswith age of 2.06 Ga on the Indian and Kola cratons [4].Thus, a fundamental change in character of tectonomagmatic activity acted as thetrigger for environmental changes and acceleration of biospheric evolution, supplying aqualitatively new material on the Earth’s surface. This event gave impetus to wide expansionof biosphere, which fixed by appearance of oxidative atmosphere, and enhanced biospheremass as demonstrated by appearance of hydrocarbon deposits. However, rapid enhanced ofthe bulk of biosphere did not accompanied by the same increasing of the biodiversity; newforms (especially multicellular organism) appeared in small quantity and long time did notessential evolved.Acknowledgements. The study was supported by the Russian Foundation for BasicResearch, project 11‐05‐00695.References[1]. Akhmedov, A.M. and Belova, M.Yu.: Position of Microfossils in the Generalized Proterozoic section of tehBaltic shield and their relation with metallogenic specialization of host sedimentary complexes, 55 thSession of Paleontological Society, St. Petersburg, 2009.[2]. Belova M.Yu., Akhmedov A.M.: Petsamomyces, A New Genus of Organic‐Walled Microfossils from theEarly Paleoproterozoic Coal‐Bearing Deposits, Kola Peninsula, Paleontol. Journ., No 5, pp.3‐12, 2006.[3]. Guo Q., Strauss H., Kaufman A.J. et al. Reconstructing Earth’s surface oxidation across the Archean‐Proterozoic transition, Geology, Vol. 37, pp. 399‐402, 2009.[4]. Melezhik V.A., Fallick A.E., Hanski E.J. et al.: Emergence of the aerobic biosphere during the Archean‐Proterozoic transition: challenger of future research, GSA Today, Vol. 15, pp .4‐11, 2005.[5]. McKay D.S., Gibson E.K., Thomas‐Keprta K.L., et al.: Search for past life on Mars: possible relic biogenicactivity in Martian Meteorite ALH 84001, Science, Vol. 273, pp. 924‐930, 1996.[6]. Morozov, A.F., Khakaev, B.N., Petrov, O.V., et al. Rock‐salt mass expose in the Paleoproterozoic sequenceof the Onega Trough in Karelia (after the Onega Parametric Well data). Dokl. Earth Sciences, 435 (2), 230‐233, 2010.[7]. A.Yu. Rozanov, M.M. Astafieva, Prasinophyceae (Green Algae) from the Lower Proterozoic of the KolaPeninsula, Paleontol. J., No. 4, pp. 90‐93, 2008.[8]. Sayutina, T.A. and Vil’mova E.S., Problematic fossils Udokania Leites from the Proterozoic deposits ofTransbaikalia, Paleontol. J., no. 3, pp. 100‐105, 1990.[9]. Schidlowski M. A: 3.800‐million‐year isotopic record of life from Carbon in sedimentary rocks, Nature, Vol.333, pp. 313‐318, 1988.[10]. Sharkov E.V., Bogatikov O.A. Tectonomagmatic evolution of the Earth and Moon, Geotectonics. Vol. 44 (2),pp. 83‐101, 2010.65