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Did diamond-bearing orangeites originate from MARID-veined peridotites in the lithospheric mantle?

Citation

Giuliani, A and Phillips, D and Woodhead, JD and Kamenetsky, VS and Fiorentini, ML and Maas, R and Soltys, A and Armstrong, RA, Did diamond-bearing orangeites originate from MARID-veined peridotites in the lithospheric mantle?, Nature Communications, 6 Article 6837. ISSN 2041-1723 (2015) [Refereed Article]


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Copyright Statement

Copyright 2015 Macmillan Publishers Limited

DOI: doi:10.1038/ncomms7837

Abstract

Kimberlites and orangeites (previously named Group-II kimberlites) are small-volume igneous rocks occurring in diatremes, sills and dykes. They are the main hosts for diamonds and are of scientific importance because they contain fragments of entrained mantle and crustal rocks, thus providing key information about the subcontinental lithosphere. Orangeites are ultrapotassic, H2O and CO2-rich rocks hosting minerals such as phlogopite, olivine, calcite and apatite. The major, trace element and isotopic compositions of orangeites resemble those of intensely metasomatized mantle of the type represented by MARID (mica-amphibole-rutile-ilmenite-diopside) xenoliths. Here we report new data for two MARID xenoliths from the Bultfontein kimberlite (Kimberley, South Africa) and we show that MARID-veined mantle has mineralogical (carbonate-apatite) and geochemical (Sr-Nd-Hf-O isotopes) characteristics compatible with orangeite melt generation from a MARID-rich source. This interpretation is supported by U-Pb zircon ages in MARID xenoliths from the Kimberley kimberlites, which confirm MARID rock formation before orangeite magmatism in the area.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:100108
Year Published:2015
Funding Support:Australian Research Council (DP130100257)
Web of Science® Times Cited:36
Deposited By:Earth Sciences
Deposited On:2015-05-02
Last Modified:2017-10-30
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