True elemental imaging of pyrites from Witwatersrand reefs
Abstract
Dynamic analysis imaging was used on-line to obtain true elemental maps of round, compact pyrite from Witwatersrand reefs. Zones of high and low As concentrations were detected, which are spatially related to zones of Au accumulation. Thus, elemental maps provide key information for the discussion of the origin of the gold-pyrite association and suggest a correlation between zones of high As and gold. This is interpreted in terms of a model based on electrochemical reduction of gold complexes driven by the galvanic cell produced by zones of varying As concentration.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- September 1995
- DOI:
- 10.1016/0168-583X(95)00458-0
- Bibcode:
- 1995NIMPB.104..450P