Author:
Benzaazoua M.,Marion P.,Robaut F.,Pinto A.
Abstract
Abstract
A multidisciplinary approach has been used to study Au occurrences within
pyrite and arsenopyrite in four refractory Au ores from Colombia, France (Le
Châtelet and Villeranges) and Portugal (Neves Norte). The Au was characterized by
optical and scanning electron microscopy and analysed using electron and ion
microprobes to determine Au distribution, with particular attention to spectral
interferences in electron and ion microprobes, background measurements in electron
probes, and quantitative analysis using external standardization in ion probes.
The ionic emission rate is proven to be dependent on the Au status; combined Au
has a greater ion emission than metallic Au. Invisible Au occurrences are closely
linked to As distribution. Gold bonding in arsenopyrite, examined by transmission
electron microscopy, is shown to be dispersed within the FeAsS crystal structure.
Typical growth patterns and As-Au diffusion zoning in pyrite and arsenopyrite may
account for the very irregular distribution of Au in these minerals.
Subject
Geochemistry and Petrology
Cited by
33 articles.
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