Abstract
Sedimentological features of the Upper Cambrian–Middle Ordovician rocks exposed in eastern Taimyr in the Faddey Gulf area are discussed. The studied sections belong to the transitional facies zone located between the carbonate platform (Siberian Platform continuation) in the south and a relatively deep-water basin in the north. The studied deposits compose a genetically coherent sequence formed in the distal zone of the siliciclastic–carbonate ramp at a depth exceeding the storm wave base. The lower (Upper Cambrian–lowermost Ordovician) part of the sequence is represented by limestones, dolomitized carbonate siltstones, and sandstones with shale layers. The upper (Lower–Middle Ordovician) part of the studied interval is dominated by shales with thin layers of carbonate siltstones. The carbonate detritus was sourced from a shallow-water shelf located south of the studied sections. The siliciclastic admixture in carbonate siltstones and sandstones was sourced from an island in the northern part of the modern Siberian Platform. The sandy material was transported by storm bottom currents; the fine-grained particles, by surface currents and winds as particulates and suspension clouds in the bottom water. Carbonate sandstones with the typical turbidite sedimentary structures, common in the lower part of the section, were deposited by turbidity currents initiated by storms. At that time, a prominent break likely existed in the ramp profile. The predominant NE orientation of flute casts indicates the alongslope (or along the trough axis) transport of material by bottom currents. The ramp topography was leveled in the second half of the Early Ordovician and in the Middle Ordovician.
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ACKNOWLEDGMENTS
The authors are grateful to V.F. Proskurin and other colleagues from the Division of Regional Geology and Mineral Resources in Eastern Russia, Karpinsky Russian Geological Research Institute (VSEGEI), for assisting the organization and accomplishment of field works.
Funding
This work was supported by the Russian Foundation for Basic Research (project no. 19-05-00926). Studies by M.K. Danukalova and A.B. Kuzmichev were accomplished in accordance with research plans of Geological Institute, Russian Academy of Sciences.
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Translated by D. Sakya
In the present paper, term “carbonate platform” is used sensu lato (Pomar, 2001).
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Danukalova, M.K., Kuzmichev, A.B., Bagaeva, A.A. et al. Lower Paleozoic Deposits in the Transition Zone between the Carbonate Platform and Black Shale Basin (Eastern Taimyr). Lithol Miner Resour 57, 44–61 (2022). https://doi.org/10.1134/S0024490222010035
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DOI: https://doi.org/10.1134/S0024490222010035