淄博煤田煤的稀土元素地球化学特征
Geochemical Characteristics of Rare Earth Elements of Coal in Zibo Coalfield
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摘要: 应用电感耦合等离子体质谱法（ICP—MS）对淄博煤田煤（35个样品，其中12个顶底板样品及1个夹矸样品）的稀土元素进行测试，并测定了灰分及相关的伴生元素含量。全面分析了稀土元素、地球化学参数、空间分布规律及分布模式，探讨了淄博煤田石炭—二叠纪煤中稀土元素的特征及来源。研究表明：与国内外其他地区相比，淄博地区煤中稀土元素相对富集；太原组煤中的稀土元素高于山西组，在同一煤层中自顶部到底部呈现增高趋势，并在顶底板和夹矸中明显富集；Eu存在明显的负异常，而Ce值基本正常，表明成煤环境可能为浅海或封闭海域，不同煤层稀土元素分布模式基本一致，稀土元素与灰分正相关，与反映陆源的元素相关性较好，而与反映海相的元素相关性较差。Abstract: The aboudances of the rare earth elements (REEs) of 35 coal samples (including 12 samples of floor and roof seam and 1 gangue sample) in Zibo coalfield were determined by inductively coupleplasma mass spectrometry (ICPMS), and the content of ash and some correlative associated elements are also tested. The contents of the REE, geochemical parameters, spatial distribution and distribution patterns were studied in this paper. Furthermore, the author discussed the characteristics and origin of REE in the samples. The results are as follows: Compared with others areas at home and abroad, the REE are obviously enriched in Zibo coalfield. The REE contents in the Taiyuan Formation are higher than that in the Shanxi Formation. They rise from top to bottom in the coal seam and enrich in the floor and roof and gangue samples. The negative anomalies exists in the value of δEu and normal value in δCe indicate that the sedimentary environment of coal may shallow or close sea. The REE in coal is correlative to the ash contents in those coals, and they have good relativity with the terrigenous elements while weak with the marine elements.
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Key words:
- rare earth elements /
- geochemistry /
- coal /
- PermoCarboniferous /
- Zibo coalfield
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