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Garnets from the Camafuca-Camazambo kimberlite (Angola)

Correia, E.; Laiginhas, F.

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Authors

E. Correia

F. Laiginhas



Abstract

This work presents a geochemical study of a set of garnets, selected by their colors, from the CamafucaCamazambo kimberlite, located on northeast Angola. Mantle-derived garnets were classified according to the scheme proposed by Grütter et al. (2004) and belong to the G1, G4, G9 and G10 groups. Both sub-calcic (G10) and Ca-saturated (G9) garnets, typical, respectively, of harzburgites and lherzolites, were identified. The solubility limit of knorringite molecule in G10D garnets suggests they have crystallized at a minimum pressure of about 40 to 45 kbar (4– 4.5 GPa). The occurrence of diamond stability field garnets (G10D) is a clear indicator of the potential of this kimberlite for diamond. The chemistry of the garnets suggests that the source for the kimberlite was a lherzolite that has suffered a partial melting that formed basaltic magma, leaving a harzburgite as a residue.

Citation

Correia, E., & Laiginhas, F. (2006). Garnets from the Camafuca-Camazambo kimberlite (Angola). Anais da Academia Brasileira de Ciências, 78(2), 309-315. https://doi.org/10.1590/s0001-37652006000200010

Journal Article Type Article
Acceptance Date Jun 13, 2005
Publication Date Jun 1, 2006
Deposit Date Feb 23, 2016
Publicly Available Date Feb 23, 2016
Journal Anais da Academia Brasileira de Ciências.
Print ISSN 0001-3765
Electronic ISSN 1678-2690
Publisher Academia Brasileira de Ciências
Peer Reviewed Peer Reviewed
Volume 78
Issue 2
Pages 309-315
DOI https://doi.org/10.1590/s0001-37652006000200010
Keywords Kimberlite, Diamond, Garnet, lherzolite, Harzburgite.

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