| Registro completo |
| Provedor de dados: |
Anais da ABC (AABC)
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| País: |
Brazil
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| Título: |
Garnets from the Camafuca-Camazambo kimberlite (Angola)
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| Autores: |
Correia,Eugénio A.
Laiginhas,Fernando A.T.P.
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| Data: |
2006-06-01
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| Ano: |
2006
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| Palavras-chave: |
Kimberlite
Diamond
Garnet
Lherzolite
Harzburgite
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| Resumo: |
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 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200010
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| Editor: |
Academia Brasileira de Ciências
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| Relação: |
10.1590/S0001-37652006000200010
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| Formato: |
text/html
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| Fonte: |
Anais da Academia Brasileira de Ciências v.78 n.2 2006
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| Direitos: |
info:eu-repo/semantics/openAccess
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