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Geochemical Characteristics of Jurassic Plume Magmatism in Ahlmannryggen Massif (Queen Maud Land, East Antarctica)

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Abstract

The Mesozoic dykes related to the distribution of Karoo plume on the territory of East Antarctica are studied. It is shown that magnesian high-Ti ferrobasalts are found in the area of Ahlmannryggen massif. Their formation is determined by melting of the mantle that contains pyroxenite. The isotope characteristics of the studied dolerites reflect the composition of a pyroxenite source, i.e., the ancient oceanic lithosphere (EMI) that subsided to the mantle depths of 150–170 km in the paleosubduction zone of the continent of Gondwana and was transformed to the pyroxenite melt 180 Ma ago during the interaction with mantle peridotite of the plume.

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ACKNOWLEDGMENTS

The authors are grateful to the management of the Center for Isotopic Research, Karpinskii Russian Geological Research Institute (St. Petersburg) for the opportunity provided to carry out isotopic research and to the personnel of the Center for assistance in conducting analytical work.

Funding

This work was supported by the Russian Science Foundation (project no. 16-17-10139).

Author information

Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, 119991, Moscow, Russia

    N. M. Sushchevskaya, V. G. Batanova &  A. V. Sobolev

  2. Karpinsky Russian Geological Research Institute, Center for Isotopic Research, 199106, St. Petersburg, Russia

    B. V. Belyatsky

  3. Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World Ocean, 190121, St. Petersburg, Russia

    G. L. Leitchenkov

  4. Université Grenoble Alpes, Institute Science de la Terre (ISTerre), Grenoble, France

    V. G. Batanova &  A. V. Sobolev

Authors
  1. N. M. Sushchevskaya
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  2. B. V. Belyatsky
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  3. G. L. Leitchenkov
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  4. V. G. Batanova
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  5. A. V. Sobolev
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Corresponding authors

Correspondence to N. M. Sushchevskaya or B. V. Belyatsky.

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Translated by L. Mukhortova

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Sushchevskaya, N.M., Belyatsky, B.V., Leitchenkov, G.L. et al. Geochemical Characteristics of Jurassic Plume Magmatism in Ahlmannryggen Massif (Queen Maud Land, East Antarctica). Dokl. Earth Sc. 486, 529–532 (2019). https://doi.org/10.1134/S1028334X19050076

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  • DOI: https://doi.org/10.1134/S1028334X19050076

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