ISSN:
1432-1866
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Hydrothermal alteration of peraluminous granitic rocks, occurring at Varkenskraal, northwest of the Witwatersrand Basin, consists of two major styles. The first style, pervasive in nature, is represented by two stages: i) A propylitic alteration and ii) A disseminated sericitization. Both alteration stages were accompanied by a deposition of disseminated sulphides. The second style is represented by a vein related alteration in four stages including potassium feldspar, minor carbonate and minor sulphide mineralization. Nodules of uraniferous carbonaceous matter and small amounts of particulate gold could possibly be associated with either one or both styles. Hydrothermally altered rocks of similar nature have been observed in a number of other localities close to the Witwatersrand Basin. Their abundance, large volumes and low-grade, disseminated pyrite/gold mineralization indicate that rocks of this type could have been the provenance of the Witwatersrand gold-bearing sediments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00206614
