S.O. Zorina a*, L.S. Khabipyanov a**, N.I. Afanasieva b***, N.V. Sokerina c****, I.A. Perovskiy c*****, B.M. Galiullin a******, V.P. Morozov a*******, A.A. Eskin a********
a Kazan Federal University, Kazan, 420008 Russia
b FSUE TSNIIGEOLNERUD, Kazan, 420097 Russia
c N.P. Yushkin Institute of Geology, Komi Science Center, Ural Branch, Russian of Academy of Sciences, Syktyvkar, 167982 Russia
E-mail: *email@example.com, **firstname.lastname@example.org, ***email@example.com, ****firstname.lastname@example.org, *****email@example.com, ******firstname.lastname@example.org, *******Vladimir.email@example.com, ********firstname.lastname@example.org
Received September 29, 2017
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The Mezino-Lapshinovka section is constituted by the Upper Cretaceous carbonate clayey siliceous succession. It has been studied by XRD, SEM, microprobe, and geochemical analyses in order to reconstruct the main geologic events that influenced the formation of gaizes in the NE Peri-Tethys. A new scenario for their formation proposes that open-ocean siliceous ooze might have been delivered to the active subduction zone of the African-Arabian plate and then deposited in the shallow basin of NE Peri-Tethys. The bentonite interbeds were probably formed due to diagenetic alteration of the volcanic ash. It has been suggested that the sea water during the Santonian- Campanian was characterized by the oxic conditions, while there were two short episodes of anoxia or so-called anoxic non-sulfidic conditions. The early Santonian anoxic episode can be linked to the global anoxic event OAE 3 in the NE Peri-Tethys. The Campanian Mn anomaly coupled with the simultaneous increase in δ13C is considered to be a manifestation the Campanian eustatic rise.
Keywords: Upper Cretaceous, chronostratigraphy, gaizes, anoxia, OAE 3, Eastern Russian Platform, geochemistry, sea level changes
Acknowledgments. The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. The study was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities (project no. 5.2192.2017/4.6). The work was also supported by the Ministry of Science and Higher Education of the Russian Federation (contract no. 14.Y26.31.0029) in the framework of the Resolution no. 220 of the Government of the Russian Federation.
Fig. 1. The location of the Mezino–Lapshinovka section: a) on the palaeographical map of the Late Cretaceous – in the NE Peri-Tethys (simplified according to ); b) on the tectonic map of the ERP – within the boundaries of the Ulyanovsk–Saratov trough ( with modifications).
Fig. 2. The lithology and chronostratigraphy of the Mezino–Lapshinovka section. Key: 1 – sandstones; 2 – marlstones; 3 – clays; 4 – gaizes; 5a – silicified patches; 5b – glauconite; 6a – belemnites; 6b – bivalves; 7 – sampling sites.
Fig. 3. The electron microscope images of gaizes from the Mezino–Lapshinovka section: a, b – OCT globules and the EDS spectrum of silicified globules at the selected point (cross); c – accumulations of spherical and octahedral formations of a presumably bacterial origin and constituted by siderite. Dashed lines show the areas of octahedral formations, solid lines are spherical formations.
Fig. 4. The geochemical data on the Mezino–Lapshinovka section. See Fig. 2 for Key.
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For citation: Zorina S.O., Khabipyanov L.S., Afanasieva N.I., Sokerina N.V., Perovskiy I.A., Galiullin B.M., Morozov V.P., Eskin A.A. Lithostratigraphy, geochemistry, and depositional environments of the Upper Cretaceous succession from the Mezino-Lapshinovka section (Eastern Russian Platform). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2018, vol. 160, no. 3, pp. 484–499. (In Russian)
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