关键词: 地质地球化学, 矿床成因, 青山金矿

Abstract: The field geological investigation of Qingshang gold deposit and the geochemical analysis of its ore and country rock indicate that the ore-forming association is Au-Ag-As-Sb-Ba; the Au content in the ore occurrence stratum is far greater than the background value; both the country rock and ore have a high U/Th value, a basically identical rare earth element distribution, and Ce negative anomaly and Eu positive anomaly; the hydrogen and oxygen isotope values of the ore-forming fluid have an evident “oxygen drift”; the metallogenic temperature ranges between 160 ℃ and 220 ℃; and the fluid inclusions have high contents of Ca2＋, CO₂ and HCO_-³, indicating that the ore-forming fluid is underground thermal brine of bicarbonate-sodium chloride type. It is suggested that Qingshan gold deposit of hot spring type is formed by the chronically repeated recycling, transformation, enrichment and settlement of the Au from the source bed in the Devonian system by the underground hot brine originating from rainfall. 

Key words: Geological-geochemical characteristics, Metallogenesis, Qingshan gold deposit