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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2006
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32778210 |
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Table of Contents:
- Garnets from the Camafuca-Camazambo kimberlite (Angola) Eugénio A. Correia Fernando A.T.P. Laiginhas Multidisciplinaria (Ciencias Naturales y Exactas) garnet diamond kimberlite lherzolite harzburgite This work presents a geochemical study of a set of garnets, selected by their colors, from the Camafuca-Camazambo kimberlite, located on northeast Angola. Mantle-derived garnets were classified according tothe 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 crystallizedat a minimum pressure of about 40 to 45 kbar (4 4.5 GPa). The occurrence of diamond stabilityfield garnets(G10D) is a clear indicator of the potential of this kimberlite for diamond. The chemistry of the garnetssuggests that the source for the kimberlite was a lherzolite that has suffered a partial melting that formedbasaltic magma, leaving a harzburgite as a residue. 2006 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32778210 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.78