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Contributions to mineralogy and petrology, 2005-06, Vol.149 (4), p.430-445
2005
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Autor(en) / Beteiligte
Titel
Lower mantle diamonds from Rio Soriso (Juina area, Mato Grosso, Brazil)
Ist Teil von
  • Contributions to mineralogy and petrology, 2005-06, Vol.149 (4), p.430-445
Ort / Verlag
Heidelberg: Springer Nature B.V
Erscheinungsjahr
2005
Quelle
SpringerLink
Beschreibungen/Notizen
  • 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, lsquoolivinersquo, 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. [PUBLICATION ABSTRACT]
Sprache
Englisch
Identifikatoren
ISSN: 0010-7999
eISSN: 1432-0967
DOI: 10.1007/s00410-005-0657-8
Titel-ID: cdi_proquest_journals_208184893
Format
Schlagworte
Diamonds, Mineralogy, Nitrogen, Petrology

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