Publications des scientifiques de l'IRD

Michel D., Giuliani Gaston, Pulz G.M., Jost H. (1994). Multistage gold deposition in the Archaean Maria Lazara gold deposit (Goias, Brazil). Mineralium Deposita, (29), p. 94-97. ISSN 0026-4598.

Titre du document
Multistage gold deposition in the Archaean Maria Lazara gold deposit (Goias, Brazil)
Année de publication
1994
Type de document
Article
Auteurs
Michel D., Giuliani Gaston, Pulz G.M., Jost H.
Source
Mineralium Deposita, 1994, (29), p. 94-97 ISSN 0026-4598
The Maria Lazara gold deposit in the Archaean Guarinos greenstone belt, central Brazil, consists of quartz-carbonate veins formed in a ductile shear zone. Study of the sulphides and gold-bearing quartz-carbonate veins and veinlets of the potassic hydrothermal alteration zone reveals two stages of ore paragenesis. The first stage corresponds to S-rich arsenopyrite deposition and the second one to the precipitation of As-rich arsenopyrite and Bi-Te-Au-S phases. Modes of occurrence, textures and Ag contents of native gold define two types of gold. The first type is native gold with Ag contents greater than 5 wt % postdating the S-rich arsenopyrites. The second type has Ag contents less than 3 wt % and is contemporaneous with Bi-Te-S phases. (Résumé d'auteur)
Plan de classement
Géochimie [064GEOCHI]
Descripteurs
GEOCHIMIE ; OR ; GITOLOGIE ; MINERALOGIE ; PARAGENESE
Description Géographique
BRESIL ; GOIAS
Localisation
Fonds IRD [F B41481]
Identifiant IRD
fdi:41481
Contact