Relationship between Thermal Metamorphism of Coal and the Periodic Variation Law of Geochemical Behavior of Elements: A Study on the C2 Coal Seam in the Fengfeng Mining Area of the Handan Coalfield in Hebei, China,Acta Geologica Sinica-English Edition

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Relationship between Thermal Metamorphism of Coal and the Periodic Variation Law of Geochemical Behavior of Elements: A Study on the C2 Coal Seam in the Fengfeng Mining Area of the Handan Coalfield in Hebei, China
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-03-24 , DOI: 10.1111/1755-6724.14681
Jianye YANG ₁ , Shenjun QIN ₂ , Weiguo ZHANG ₃ , Shande LIU ₄ , Fei XU ₂

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This study highlights the response of the periodic variation of the geochemical behavior of elements to the thermal metamorphism of coal by considering the differentiation mode and differentiation degree of elements of the C2 coal seam in the Fengfeng mining area of the Handan Coalfield in Hebei, China. The periodic variation of the geochemical behavior of elements was observed to change towards a certain direction as the degree of metamorphism of a geological body increased. Based on the coincidence degree (or similarity degree) between the geochemical behavior of elements and periodic variation of elements, the 57 elements in this study were divided into two levels. The periodic variation of the geochemical behavior of first-level elements was largely synchronous with that of their first ionization energy, suggesting that only one differentiation mode exists and the elements are mainly inorganically associated. The differentiation mode of the second-level elements deviated to a certain extent from their first ionization energy; the larger the deviation, the more complicated and diverse was the differentiation mode. Among the second-level elements, the grade of coal metamorphism has evident and intuitive effects on the proportion of elements with particular structural features, such as the 4q+3 type of elements and the odd-odd elements. In addition, the distribution of elements in organic and inorganic matter within coal are subject to the structural features of the elements. The differentiation mode and differentiation intensity of elements could be characterized by the hierarchical parameter and differentiation intensity. The hierarchical parameter and differentiation intensity of certain elements showed a good positive or negative correlation with R_max in coal. The 57 elements in this study were quantitatively ordered according to the degree of magmatic hydrothermal fluid influence and thermal metamorphism of coal through graphs depicting the goodness of fit, correlation coefficient with R_max, and differentiation intensity. The results of this study are consistent with the results of previous field research, illustrating the scientific significance and application value of this study on the periodic variation of the geochemical behavior of elements.

中文翻译：

煤热变质作用与元素地球化学行为周期变化规律的关系——河北邯郸煤田风峰矿区C2煤层研究

本研究通过考虑河北邯郸煤田凤峰矿区C2煤层元素分异模式和分异程度，突出了元素地球化学行为周期性变化对煤热变质作用的响应。观察到元素地球化学行为的周期性变化随着地质体变质程度的增加而向一定方向变化。根据元素地球化学行为与元素周期变化的重合度（或相似度），将本研究中的57个元素分为两个等级。一级元素地球化学行为的周期性变化与其第一电离能的变化基本同步，表明仅存在一种分化模式并且元素主要是无机结合的。二级元素的分化方式与其一级电离能有一定的偏差；偏差越大，分化模式越复杂多样。在二级元素中，煤变质等级对4q+3型元素和奇奇元素等具有特定结构特征的元素比例有明显直观的影响。此外，煤中有机质和无机质中元素的分布受元素结构特征的影响。要素的分化方式和分化强度可以用层次参数和分化强度来表征。煤中的R_最大值。本研究中的57个元素根据岩浆热液影响程度和煤的热变质程度，通过拟合优度、与R _{max 的}相关系数和分异强度的图表进行定量排序。本研究结果与前期野外研究结果一致，说明了本研究对元素地球化学行为周期性变化的科学意义和应用价值。

更新日期：2021-03-24

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