Abstract:

The Hetaoping Pb-Zn deposit of Baoshan County is located in western Yunnan Province. It is one of large-scale lead-zinc(copper-silver)polymetallic deposits characterized of vein skarn-type ore-bearing deposits and controlled by fractures in Three River area of Yunnan Province, southwestern China. The authors systematically studied rare earth element (REE) geochemical characteristics of the surrounding rocks, Pb-Zn ores and hydrothermal veins of Hetaoping Pb-Zn ore fields. The results show that REE in the surrounding rocks is mainly enriched in clay minerals. The skarn fluids extract the REE in the surrounding rocks and change their REE chondrite-normalized patterns. For now, exploration revealed shallow skarn diagenetic fluid is in medium-low temperature and acid-weak acid fluid, with the fluid evolutionary, the acidity of the fluid increases. Combined with the previous researching results, it is considered that the Hetaoping Pb-Zn deposit is a distal skarn-type Pb-Zn deposit and the rock-and ore-formations of the skarm and lead-zine (copper-silver) controlled by magmatic hydrothermal.

Key words: rare earth element geochemistry, surrounding rock, distal skarn, Hetaoping Pb-Zn deposit, western Yunnan Province