鄂西鹤峰地区牛蹄塘组石煤中稀土元素分布规律及其赋存特征

Distribution law and occurrence characteristics of rare earth elements in stone coal of Niutitang Formation in Hefeng area,western Hubei

扬子地区下寒武统牛蹄塘组石煤地层是鄂西地区重要的赋矿层位,前人多对该区域牛蹄塘组页岩气成藏开展调查研究工作,而对牛蹄塘组石煤中元素富集异常关注不够,为探讨鄂西鹤峰地区牛蹄塘组石煤富矿元素富集状态,本文对鹤地3井牛蹄塘组石煤地层展开稀土微量元素分析测试。结果表明:鹤峰地区牛蹄塘组石煤层中Li、Sc、Co、Ga、Ta、Tl、Zn、Nb、Th、Cd、In、Cs元素含量处于轻度富集状态,Cu、Ni、Mn、Cd元素含量处于富集状态,Rb、U、Ba、Cr、V、Mo元素含量处于高度富集状态。稀土元素总量(∑REE=211.10μg/g)较高,轻与重稀土元素均相对富集,轻稀土分馏程度高而重稀土元素分馏程度低,稀土元素配分模式与上地壳基本一致。本研究总结了鄂西鹤峰地区牛蹄塘组石煤伴生的稀土元素分布规律及赋存特征,为湖北省石煤及其伴生矿的成矿规律研究提供新的思路。

The Lower Cambrian Niutitang Formation stone coal in the Yangtze region is an important orebearing bed in western Hubei.In order to investigate the element enrichment status of the stone coal rich deposits in the Niutitang Formation in Hefeng area,the analysis and test of rare earth trace elements in the Niutitang Formation in Well 3 of Hedi are carried out.The results show that the contents of Li,Sc,Co,Ga,Ta,Tl,Zn,Nb,Th,Cd,In and Cs are slightly enriched,the contents of Cu,Ni,Mn and Cd are enriched,and the contents of Rb,U,Ba,Cr,V and Mo are highly enriched.ΣREE is higher,light and heavy REE elements are relatively enriched,light REE elements are higher and heavy REE elements are lower.The partition pattern of REE elements is basi⁃cally consistent with the upper crust.This study systematically summarized the distribution and occurrence characteristics of rare earth elements associated with stone coal in the Niutitang Formation,Hefeng area,western Hubei,providing a new idea for the study of the metallogenic regularity of stone coal and its associated ore in Hubei Province.