Publications des scientifiques de l'IRD

Salvi S., Amponsah P. O., Siebenaller L., Béziat D., Baratoux Lenka, Jessell Mark. (2016). Shear-related gold mineralization in Northwest Ghana : the Julie deposit. Ore Geology Reviews, 78, p. 712-717. ISSN 0169-1368.

Titre du document
Shear-related gold mineralization in Northwest Ghana : the Julie deposit
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000378450300048
Auteurs
Salvi S., Amponsah P. O., Siebenaller L., Béziat D., Baratoux Lenka, Jessell Mark
Source
Ore Geology Reviews, 2016, 78, p. 712-717 ISSN 0169-1368
The Julie deposit is currently the largest gold prospect in NW Ghana. It is hosted in sheared granitoids of TTG composition of the Paleoproterozoic Julie greenstone belt. The main mineralization consists of a corridor of gold-bearing quartz veins forming a network of a few tens of metres in thickness, trending E-W and dipping 30-60 degrees N, contained within the main shear zone that affects these rocks. The core of this vein corridor is altered by sericite, quartz, ankerite, calcite, tourmaline and pyrite, and is surrounded by an outer halo consisting of albite, sericite, calcite, chlorite, pyrite and rutile. Asecond set of veins, conjugate to the first set, occurs in the area. These veins have alteration halos with a similar mineralogy as the main corridor, however, their extent, as well as the size of the mineralization, is less important. In the main corridor, gold forms micron-sized grains that occur in pyrite as inclusions, on its edges, and in fractures crosscutting it. Silver, tellurium, bismuth, copper and lead commonly accompany the gold. Pyrite occurs disseminated in the veins and in the surrounding rocks. Up to several ppm Au occurs in the structure of pyrite from the main mineralization.
Plan de classement
Géologie et formations superficielles [064]
Description Géographique
GHANA
Localisation
Fonds IRD [F B010067642]
Identifiant IRD
fdi:010067642
Contact