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Contributions to Mineralogy and Petrology

, Volume 149, Issue 4, pp 430–445 | Cite as

Lower mantle diamonds from Rio Soriso (Juina area, Mato Grosso, Brazil)

  • Patrick C. Hayman
  • Maya G. Kopylova
  • Felix V. Kaminsky
Original Paper

Abstract

The morphology, colour, fluorescence, cathodoluminescence, nitrogen content and aggregation state, internal structure and mineral inclusions have been studied for 69 alluvial diamonds from the Rio Soriso (Juina area, Mato Grosso State, Brazil). Nitrogen in most diamonds (53%) is fully aggregated as B centres, but there is also a large proportion of N-free stones (38%). A strong positive correlation between nitrogen and IR-active hydrogen concentrations is observed. The diamonds contain (in order of decreasing abundance) ferropericlase, CaSi-perovskite, magnetite, MgSi-perovskite, pyrrhotite, ‘olivine’, SiO2, perovskite, tetragonal almandine-pyrope phase and some other minerals represented by single grains. The Rio Soriso diamond suite is subdivided into several subpopulations that originated in upper and lower mantle of ultramafic and mafic compositions, with the largest subgroup forming in the ultramafic lower mantle. Analysed ferropericlase grains are enriched in Fe (Mg#=0.43–0.89), which is ascribed to their origin in the lowermost mantle. The Juina kimberlites may be unique in sampling the material from depths below 1,700 km that ascended in a plume formed at the core–mantle boundary.

Keywords

Olivine Lower Mantle CaSiO3 Mantle Boundary Diamond Inclusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are grateful to Diagem International Resource Corporation and personally to David Cohen for permission to publish. Mati Raudsepp is thanked for his help with the electron microprobe and Andrea De Stefano is thanked for doing SEM-CL on several diamonds and for help in interpreting the data. Reviews by R. Davies and N. Tomioka improved the manuscript immensely. Funding for this project was provided by an NSERC research grant to MGK.

Supplementary material

eTable_1.doc (180 kb)
DOC 185 KB
eTable_2.xls (23 kb)
XLS 24 KB
eTable_3.doc (30 kb)
DOC 32 KB

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Patrick C. Hayman
    • 1
  • Maya G. Kopylova
    • 1
  • Felix V. Kaminsky
    • 2
  1. 1.Department of Earth and Ocean SciencesUniversity of British ColumbiaVancouverCanada
  2. 2.KM Diamond Exploration Ltd.West VancouverCanada

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