HUNG-lin¹, LIU-ling^2*, WEN Xing-qiao², SHI Qing-peng², ZUO-Dan¹

(1. No. 104 Party of Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Duyun 558000, China;
2. No. 101 Party of Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Kaili 556000, China)

Abstract: Based on the relationship between characteristics of mineralogy, trace and rare earth elemental, sulfur isotopic geochemistries and the lead-zinc mineralization of the deposit, in this paper, we have discussed the source of lead-zinc ore- forming minerals and metallogenic regularity of the Sinian lead-zinc deposit. The ore-hosting rock of Yundong lead-zinc deposit is mainly carbonate rock. The sulfide minerals are mainly sphalerite (beige) and pyrite. The ores have mainly fine grained texture and brecciated, veining, and fine-grained disseminated structures. Pb, Zn, Ag, and Cd are enriched in lead-zinc mineralized rocks. The ores and wallrocks contain ∑REE contents of 9.8×10-6－93.1×10-6 and 10.2×10-6－127×10-6, respectively, with similar REE distribution patterns which are mainly characterized by the enrichment of light rare earth elements and the depletion of heavy rare earth elements. The sulfur isotopic compositions (δ34S) vary from13.5‰ to 25.3‰, with an average value of 32.6‰±1.8‰. They are significantly lower than the sulfur isotopic composition of Early Cambrian seawater (δ34SVCDT=29.00‰－37.2‰), even much lower than sulfur isotopic compositions of barites in the Dahebian barite deposit (δ34SBrt=37.5‰－45‰), but are relatively close to those of sulfides in the Dongjiahe lead-zinc deposit in Hunan Province. Therefore, it is believed that the sulfur of the deposit could be originated from the reduction of sulfates in paleo-seawater in Sinian Doushantuo period.

Keywords: Pb-Zn deposit; deposit characteristics; trace elements; rare earth elements; sulfur isotope; the Yundong Area, Tianzhu County

ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 458-465