Preliminary Study of the Characteristics and Genesis of Arsenate Minerals in the Oxidized Zone of the Debao Skarn-Type Cu-Sn Ore Deposit in Guangxi

Through the study of the oxidized zone of the Debao skarn-type Cu-Sn deposit in Guangxi, the authorshave found 14 arsenate minerals, most of which are for the first time reported in China. They are mainly Cuarsenate minerals with subordinate Cu-Pb arsenate minerals and minor Fe-Pb-Ba varieties. Based on their paragenesis these minerals may be divided into the following series: (1) the clinoclasite-olivenite-cornwallite- cornubite- debaoite- copper silicarsenate association, (2) the scorodite- carminite- beudan-tite-bayldonite- duftite association, and (3) the scorodite-Ba-bearing pharmacosiderite- dussertite association. Arsenate minerals are formed generally in the oxidized zone of the sulfide-type deposits which lie in thewarm, humid and rainy torrid-subtropical zone with pH=6-8 and contain large amounts of arsenopyrite andcarbonate rocks.

Preliminary Study of the Characteristics and Genesis of Arsenate Minerals in the Oxidized Zone of the Debao Skarn-Type Cu-Sn Ore Deposit in Guangxi

Abstract Through the study of the oxidized zone of the Debao skarn-type Cu-Sn deposit in Guangxi, the authors have found 14 arsenate minerais, most of which are for the first time reported in China. They are mainly Cu arsenate minerais with subordinate Cu-Pb arsenate minerais and minor Fe-Pb-Ba varieties. Based on their paragenesis these minerais may be divided into the following series: (1) the clinoclasite-olivenite-cornwallite-cornubite-debaoite-copper silicarsenate association, (2) the scorodite-carminite-beudan-tite-bayldonite- duftite association, and (3) the scorodite-Ba-bearing pharmacosiderite- dussertite association. Arsenate minerais are formed generally in the oxidized zone of the sulfide-type deposits which lie in the warm, humid and rainy torrid-subtropical zone with pH = 6-8 and contain large amounts of arsenopyrite and carbonate rocks.