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Provedor de dados:  ArchiMer
País:  France
Título:  Mineralogy, fluid inclusions and stable isotope study of epithermal Au-Ag-Bi-Te mineralization from the SE Afar Rift (Djibouti)
Autores:  Moussa, N.
Boiron, M.c-
Grassineau, N.v.
Asael, Dan
Fouquet, Yves
Le Gall, Bernard
Rolet, Joël
Etoubleau, Joel
Delacourt, Christophe
Data:  2019-08
Ano:  2019
Palavras-chave:  Fluid inclusions
Stable isotopes
Epithermal system
SE Afar Rift
Resumo:  In this paper, the mineralogy, fluid inclusions and stable isotopes of hydrothermal veins from the SE part of the Afar Rift (Djibouti) were studied. Mineralization occurs as gold-silver in quartz/carbonate veins and is mainly associated with felsic volcanism. The morphologies and textures of quartz show crustiform colloform banding, massive and breccias. Microthermometric measurements were made on quartz-hosted two phases (liquid + vapor) inclusions. Mean homogenization temperature ranges from 150°C to 340°C and ice-melting temperatures range from -0.2°C to - 1.6°C indicating that inclusion solutions contain 0.35 to 2.7 eq. wt. % NaCl. Furthermore, δ18O and δ13C values from calcite range from 3.7 to 26.6 ‰ and -7.5 to 0.3 ‰, respectively. The presence of platy calcite and adularia are consistent with boiling conditions. Our study shows that the deposit of precious-metal deposition occurred at around 250°C and is linked to a fluid generated by the mixture of magmatic fluid, hydrothermal fluid and seawater.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier BV
Formato:  application/pdf
Fonte:  Ore Geology Reviews (0169-1368) (Elsevier BV), 2019-08 , Vol. 111 , P. 102916 (14p.)
Direitos:  info:eu-repo/semantics/openAccess

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