Abstract
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 occurred at around 250 °C and is linked to a fluid generated by the mixture of magmatic fluid, hydrothermal fluid and seawater.
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