E. Correia
Garnets from the Camafuca-Camazambo kimberlite (Angola)
Correia, E.; Laiginhas, F.
Authors
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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http://creativecommons.org/licenses/by-nc/4.0/
Copyright Statement
This article is available under under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)
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