Geomorphological evolution and supergene gold ore at Posse, Goias State, Brazil

Lateritization processes and supergene ore formation

Auteurs :
HALE, M.
PORTO, C.G.
SCHWARTZ, T.

Description :
At Posse, primary gold mineralization occurs near the base of a sequence of metamorphosed volcanic and volcaniclastic rocks. During the Velhas geomorphological cycle (Oligocene to Lower Pleistocene) the region experienced extensive lateritization. The observed gold distribution in the weathering profile has arisen through saprolitization during the Velhas cycle, then leaching, compaction and downward (and limited lateral) transport of gold during pedogenesis. The climatic and geomorphological history of central Brazil has led to the formation of a low grade supergene gold orebody in the weathering profile at Posse.


Type de document :
Congrès

Source :
Meeting. 5th International Eurolat meeting, Berlin, Allemagne, 1991-08-01, Catena (Giessen), issn : 0341-8162, 1994, vol. 21, n°. 2-3, p. 145-157, Collation : Illustration, Références bibliographiques : 10 ref.

Date :
1994

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena