Reasons for the outbreak of microphytoplankton productivity in the late Oligocene Turtas Lake–Sea, Western Siberia
- Authors: Kuzmina O.B.1, Kuzmin D.V.2, Shurygin B.N.1
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Affiliations:
- Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Issue: Vol 474, No 2 (2017)
- Pages: 620-623
- Section: Geology
- URL: https://journals.rcsi.science/1028-334X/article/view/190010
- DOI: https://doi.org/10.1134/S1028334X17060204
- ID: 190010
Cite item
Abstract
Palynological (dinocysts) and geochemical data were compared for the first time for Paleogene sediments of borehole no. 8 (settlement of Russkaya Polyana, Omsk oblast). The layers with a concentrated amount of dinocysts of the genus Pseudokomewuia (20.5% of the palynocomplex) are characterized by higher contents of Fe, P, Ti, Nb, Ta, and W. The microphytoplankton bloom (an analog of the present-day red tides) in the late Oligocene Turtas Lake–Sea was probably caused by a greater contribution of nutrient substances from the continent during the transgression of this basin. Comparative analysis of the geochemical features of marine and continental Paleogene sediments from borehole no. 8 showed that the Turtas basin was either freshwater or had brackish water.
About the authors
O. B. Kuzmina
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch
Author for correspondence.
Email: KuzminaOB@ipgg.sbras.ru
Russian Federation, Novosibirsk
D. V. Kuzmin
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: KuzminaOB@ipgg.sbras.ru
Russian Federation, Novosibirsk
B. N. Shurygin
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch
Email: KuzminaOB@ipgg.sbras.ru
Russian Federation, Novosibirsk