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Lithology and Stratigraphy of the Quaternary Sediments from the Ameghino Segment of the Atlantic Patagonian Margin

  • MARINE GEOLOGY
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Oceanology Aims and scope

Abstract

The paper provides the first lithological and age data from the Ameghino segment of the Atlantic Patagonian Margin. The multiproxy study, which involves lithology, microfossils, magnetic susceptibility, color reflectance, and accelerator mass spectrometry radiocarbon (AMS-14C) dating, made it possible to establish the litho- and chronostratigraphic frame of six short (<1 m) sediment cores from the continental margin from a water depth range of 2–2.3 km. The units corresponding to marine oxygen-isotope stages (MIS) 1–3 are identified and distantly correlated with simultaneous units of reference core AI-3327 from the Piedra Buena Terrace. The unit thickness and sedimentation rates are estimated. The occurrence of glauconite in coarse-grained sediments of the last glacial, described earlier from coeval sediments on the Piedra Buena Terrace, has now been confirmed within the Ameghino segment of the continental margin. The occurrence of contourites in the sediment cores is also confirmed, suggesting that bottom currents were involved in sedimentation.

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ACKNOWLEDGMENTS

The authors are grateful to the scientific party and crew from the Leg 4 of cruise 79 of the R/V Akademik Mstislav Keldysh for help in echo-sounding, sampling, and visual description of sediment cores, as well as to M.M. Vasilieva for grain size analyses. The authors thanks the reviewer E.I. Polyakova for careful reading of the article and valuable critical remarks.

Funding

The study was supported by the Russian Science Foundation (project no. 22-27-00421).

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

    E. V. Ivanova, D. G. Borisov, I. O. Murdmaa, G. Kh. Kazarina, N. V. Simagin & T. F. Zinger

  2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia

    T. F. Zinger

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  1. E. V. Ivanova
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  2. D. G. Borisov
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  3. I. O. Murdmaa
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  4. G. Kh. Kazarina
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Correspondence to E. V. Ivanova.

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Ivanova, E.V., Borisov, D.G., Murdmaa, I.O. et al. Lithology and Stratigraphy of the Quaternary Sediments from the Ameghino Segment of the Atlantic Patagonian Margin. Oceanology 63, 256–268 (2023). https://doi.org/10.1134/S0001437023020066

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