为深入探讨近地表岩-煤蚀变过程中稀土元素迁移、富集特征,本研究选取淮北卧龙湖煤矿8煤层为研究对象,通过ICP-MS测试其总稀土含量、轻重稀土比及铕异常特征.结果显示,总稀土含量自下而上依次降低,岩体上下部蚀变煤轻、重稀土比存在明显不同,岩体与蚀变煤铕异常差异显著.分析表明,蚀变煤总稀土和铕异常主要来自沉积继承,岩体侵入并未改其组成;而上、下蚀变煤轻重稀土分异很可能是岩体上部蚀变煤中磷灰石富集轻稀土的结果.本研究认为,蚀变煤总稀土含量、空间分布及铕异常特征均未明显遭受岩浆侵位活动改造或影响,仅岩体上部局部煤层遭受岩-煤蚀变改造而轻微富集轻稀土.
Some samples of coal and rock from seam Ⅷ in Wolonghu mine were retrieved to characterize the signature of REE with ICP-MS.The results show that the values of ∑REE reduce in turn from bottom to top;the proportion of LREE/HREE are obviously different between upper and lower samples;the δEu of coal is significantly different from pluton.Detailed analyses indicate that the ∑REE and δEu in metamorphic coal may be inherit from deposition,and the differentiation of LREE/HREE between upper and lower coal may be attributed to the enrichment of apatite in the upper coal seam.All evidences above indicate that the characteristics of ∑REE and δEu,the spatial distribution have never been affected seriously by magmatic activities except for slight enrichment of LREE in upper coal seam.
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