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    A snapshot of mantle metsomatism

    Tomlinson, E. and Beard, Andrew and Harris, J.W. (2007) A snapshot of mantle metsomatism. Geochimica et Cosmochimica Acta 71 (15), A1029-A1029. ISSN 0016-7037.

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    A set of fibrous diamonds from the Panda kimberlite (Canada) contain coexisting fluid (H2O-carbonate-KCl) and single-phase silicate (olivine, garnet, clinopyroxene) inclusions. These samples have preserved a snapshot of a natural mantle system at >4 GPa and >900o C. The silicate inclusions have fertile compositions (low Mg#, high CaO); however moderate to high Cr2O3 and Ni contents indicate that this apparent fertility is due to a secondary process - metasomatism by the concomitant fluid [1]. We present trace element data for the fluid (LA-ICP-MS) and mineral (SIMS) inclusions and investigate partitioning between, and the compositional evolution of, the fluid and mineral components. The trace element composition of the fluid is very similar to the Panda kimberlite, except for enrichments in Ba and Th, and a steeper REE pattern (La/Nd = 3 to 8). We will also investigate the possibility of a relationship between metasomatism and kimberlite petrogenesis.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 28 May 2019 15:56
    Last Modified: 02 Aug 2023 17:51


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