Geochemical studies on Dachang antimony ore deposit in Qinglong, Guizhou Province

Abstract

The Dachang antimony deposit in Qinglong, Guizhou Province, is strictly controlled by the “Dachang Layer” which is a complex altered rock occurring at unconformity between the Permian Emeishan basalt and the Maokou limestone. Based on the studies of the hanging- and foot-wall rocks, the trace elements and REE contents of the rocks and ores and heavy placer minerals in the basalt, this paper is focused on the relations between these data and the “Dachang Layer” and its hanging- and foot-wall rocks. The author pointed out that the “Dachang Layer” and basalt are the source-beds of antimony; ilmenite and magnetite are the major mineral carriers of antimony. In the processes of halmyrosis and burial metamorphism of the “Dachang Layer” and basalt, antimony was mobilized along with the mobilization of iron and was preliminarily concentrated in the “Dachang Layer”.