Sb-Bi Alloys and Ag-Cu-Pb-Sb-Bi Sulphosalts in the Jialong Cu-Sn Deposit in North Guangxi, South China

Abstract

Abstract:Although native bismuth is a relatively common mineral, native antimony is less abundant, and Sb-Bi alloys are relatively rare phases in Nature. Sb-Bi alloys and Ag-Cu-Pb-Sb-Bi sulphosalts have been discovered in the Jialong vein-type Cu-Sn deposit in North Guangxi, South China. The Jialong deposit is hosted by schist within the contact zone of a Neoproterozoic granite. Four stages of ore formation are recognised, with the Sb-Bi alloy-and sulphosalt-bearing assemblage formed during the third stage. Sulphosalts include Pb-Bi-Ag sulphosalts (pavonite), Sb-Bi sulphosalts (tintinaite, terrywallaceite), and Sb sulphosalt (ullmanite, freibergite, bournonite). Grains of Sb-Bi alloy measure 2-20 µm in diameter, show rounded margins and occur together with galena along the edges or internal fissures of sulphosalts. The Sb-Bi alloys do not coexist with bismuthinite, BiS (an unnamed mineral), or with native bismuth. Two phases of Sb-Bi alloys are identified based on back-scattered electron image observations and electron microprobe analysis. The textural and thermodynamic relationships indicate that Phase I was formed before Phase II. Phase I contains high Sb (69.15-80.12 wt %) and lower Bi (18.01-27.85 wt %), while Phase II contains low Sb (0.89-25.24 wt %) and high . Cooling in the range of 270-400 • C and decreasing sulphur fugacity promote precipitation of Sb-Bi alloys and sulphosalts during the late stage of incursion of Sb-and Bi-bearing magmatic hydrothermal fluids.

Mineralogy and in situ S and Pb isotope characteristics of ore minerals from polymetallic mineralization in the Gierczyn-Przecznica area, SW Poland

“…The min eral com po si tion of sam ples found in the "Psi Grzbiet" area is very sim i lar to the Ag-Cu-Pb-Sb-Bi sulphosalt as sem blage re ported from the schist-hosted Jialong Cu-Sn deposit in China (Liu et al, 2018). This is one of sev eral tin de posits in the Jiuwandashan-Yuanbaoshan re gion, but while many of them are spa tially and tem po rally re lated to Neoproterozoic gra nitic in tru sions (Chen et al, 2018;Yue et al, 2022), U-Pb dat ing of cas sit er ite from the Jialong de posit re vealed it is linked to the 422-420 Ma old Sirong shear zone (Yue et al, 2022).…”

Sb- Bi-Bearing Metallogeny of the SerboMacedonian-Rhodope Metallogenic Belt (SRMB)

“…The rich in Sb-and Bi-sulfosalts deposit of Jialong at south China, is hosted by schist within the contact zone of a Neoproterozoic granite. Cooling temperatures of 270-400°C and decreasing sulfur fugacity promoted the precipitation of Sb-Bi-alloys and sulfosalts during the late stage of an incursion of Sb-and Bi-bearing hydrothermal fluids (Liu et al, 2018).…”