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大风山天青石矿床位于柴达木盆地西北缘,由Ⅰ、Ⅱ、Ⅲ、Ⅳ四个矿区组成,赋矿地层为第三系上新统狮子沟组,矿体多呈薄层状、扁豆状或透镜状产于含炭钙质泥岩中,矿石主要为天青石、菱锶矿等。天青石与含矿岩石的ΣREE值较低,LREE/HREE=5.11～7.48,平均为6.58,为轻稀土富集型,Eu具显著正异常,容矿围岩Ce略显弱亏损性特征,显示成矿物质主要来源于深部热卤水;另外,柴达木盆地周缘富含有益元素流体通过化学、渗滤交代等作用后,将有益组分运移至盆地适宜部位富集成矿。由上所述,大风山地区天青石矿成矿物源主要来自于深部热卤水,盆地周缘陆缘碎屑含矿流体也有补给,反映成矿物源具多来源性特征。
Located in the northwestern margin of the Qaidam Basin, the Dafengshan Celestite deposit is composed of four mining areas Ⅰ, Ⅱ, Ⅲ and Ⅳ. The ore-bearing stratum is the Shizuigou Formation of the Neogene in the Tertiary. The ore body is mostly thin-bedded and lenticular Or lens-like carbon-containing calcareous mudstone, the ore is mainly lapis lazuli, strontianite and so on. Celestite and ore-bearing rocks have lower ΣREE values, LREE / HREE = 5.11 ~ 7.48, with an average of 6.58, indicating that they are light rare earth-rich and Eu are significantly positive anomalies. The ore-forming materials mainly come from deep hot brine. In addition, the enrichment of beneficial elements in the periphery of the Qaidam basin by chemical and percolation accounts for the migration of beneficial components to the appropriate parts of the basin for enrichment and mineralization. As mentioned above, the source rocks of the celestite ore in the Dafengshan area mainly come from the deep hot brine, and the ore-bearing fluids in the marginal margin of the basin are also recharged, reflecting the multi-source characteristics of the ore-forming source.