| Autor: |
Giusti, L., Smith, D. G. W. |
| Zdroj: |
Mineralogy and Petrology; September 1984, Vol. 33 Issue: 3 p187-202, 16p |
| Abstrakt: |
Summary The detailed characteristics of 435 placer gold grains from the North Saskatchewan and Athabasca rivers have been investigated using a combination of optical microscopy, energy dispersive electron microprobe analysis and SEM techniques. Most grains show high-fineness rims surrounding lower-fineness cores (giving an extreme range of 4.3%–46.1% Ag within an individual grain). Characteristics of the rims lend support to the hypothesis that they are the products ofin situ leaching of silver followed by transport which largely destroys a spongy texture produced by the leaching. There is no change in the average Ag content of grains of any given size range with distance downstream, which also indicates that all significant leaching takes place before transportation. However, differences are apparent in the average Ag content with grain size. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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