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重庆城口高燕锰矿属于大型碳酸盐锰矿床。文章在系统野外地质调查及样品采集基础上,结合前人研究工作,采用等离子质谱仪(ICP-MS)分析了高燕矿区师家沟、板相沟及750平硐样品的稀土元素含量。分析结果显示,其稀土元素总量范围49.79×10~(-6)~281.24×10~(-6),平均含量125.92×10~(-6);轻重稀土比值范围1.79~3.58,显示轻稀土元素富集,且轻稀土元素之间的分馏程度高于重稀土元素;w(La)/w(Ce)=0.36~0.93,δEu=1.13~2.96,呈现弱正铕异常;δCe=2.09~5.84,有强的正铈异常。认为含锰碳酸盐岩形成于强还原的碱性环境沉积过程中,且有热水参与,成岩成矿的温度小于250℃,锰富集阶段处于滨岸的高能环境中。CeS<10在本区具有示矿作用。
Chongqing Chengkou Gao Yan manganese ore is a large carbonate manganese deposit. Based on the field geological survey and sample collection, combined with the previous research work, the content of rare earth elements in the samples of Shijiagou, Banchaogou and 750 adits in Gaoyan mining area was analyzed by ICP-MS. The results show that the total rare earth elements range from 49.79 × 10 -6 to 281.24 × 10 -6 with an average content of 125.92 × 10 -6 and the ratio of light to heavy rare earths ranges from 1.79 to 3.58. Elemental enrichment and the degree of fractionation between light rare earth elements is higher than that of heavy rare earth elements; w (La) / w (Ce) = 0.36-0.93 and δEu = 1.13-2.96, showing weakly positive europium anomaly; δCe = 2.09-5.80 , There is a strong positive cerium abnormalities. It is considered that manganese-bearing carbonate rocks are formed during the process of strong reduction alkaline environment deposition with hot water. The temperature of diagenesis and mineralization is less than 250 ℃, and the manganese enrichment stage is in the high-energy environment of the coast. CeS <10 shows mineralization in this area.