关键词: 地球化学, 成矿物质, 经山寺铁矿床

Abstract: The geochemical characteristics of the main elements，trace elements and rare earth elements of Jingshansi iron deposit are analyzed.Through comparing with the same kind of iron deposits at domestic，the ore-forming material source of this deposit is discussed.Jingshansi iron deposit mainly consists of Fe₂O₃，FeO and SiO₂ with rather low contents of Al₂O₃，TiO₂，and trace elements Sc，V，Cr，which indicates that terrigenous clast materials contributed little to the ore-forming process.The w(Sr)/w(Ba) value among the mineral is from 3.37 to 52.20，all over 1，which is in accordance with that of marine-hydrothermal sediments.The value of w(SiO₂)/w(Al₂O₃) is from 48.35 to 75.49，indicating that Jingshansi iron deposit is related to the volcanic sedimentation.After PAAS standardization，the distribution patterns of rare earth elements show up as enrichment of heavy rare earth elements，deficit of light rare elements and positive anomaly of La，Eu，Y，high value of δY/δHo from 55.96 to 75.29 and the value of δLa/δYb less than 1，which reflect that rare earth elements maybe come from the mixed solution of seawater and high temperature submarine hydrothermal solution.Therefore，it is considered that the ore-forming material source of Jingshansi iron deposit derives from the intermixture of submarine volcanic hydrothermal solution and seawater.

Key words: Geochemistry, Ore-forming material, Jingshansi iron deposit