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The mineralogy of Ca-rich inclusions in sublithospheric diamonds

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Abstract

This paper discusses mineralogy of Ca-rich inclusions in ultra-deep (sublithospheric) diamonds. It was shown that most of the Ca-rich majoritic garnets are of metabasic (eclogitic) affinity. The observed variation in major and trace element composition is consistent with variations in the composition of the protolith and the degree of enrichment or depletion during interaction with melts. Major and trace element compositions of the inclusions of Ca minerals in ultra-deep diamonds indicate that they crystallized from Ca-carbonatite melts that were derived from partial melting of eclogite bodies in deeply subducted oceanic crust in the transition zone or even the lower mantle. The occurrence of merwinite or CAS inclusions in ultra-deep diamonds can serve as mineralogical indicators of the interaction of metaperidotitic and metabasic mantle lithologies with alkaline carbonatite melts. The discovery of the inclusions of carbonates in association with ultra-deep Ca minerals can not only provide additional support for their role in the diamond formation process but also help to define additional mantle reservoirs involved in global carbon cycle.

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. akademika Koptyuga 3, Novosibirsk, 630090, Russia

    D. A. Zedgenizov, A. L. Ragozin & V. V. Kalinina

  2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia

    D. A. Zedgenizov & A. L. Ragozin

  3. Geochemical Research Center (GRC), Graduate School of Science, The Tokyo University Tokyo, Tokyo, 113-0032, Japan

    H. Kagi

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  1. D. A. Zedgenizov
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Original Russian Text © D.A. Zedgenizov, A.L. Ragozin, V.V. Kalinina, H. Kagi, 2016, published in Geokhimiya, 2016, No. 10, pp. 919–930.

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Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V. et al. The mineralogy of Ca-rich inclusions in sublithospheric diamonds. Geochem. Int. 54, 890–900 (2016). https://doi.org/10.1134/S0016702916100116

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