华北若干晚古生代煤中稀土元素的赋存特征  

Modes of Occurrence of Rare Earth Elements in Some Late Paleozoic Coals of North China

作　　者：代世峰[1] 任德贻[1] 李生盛[1] 

机构地区：[1]中国矿业大学(北京校区)

出　　处：《地球学报》2003年第3期273-278,共6页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目 (编号 :40 2 0 2 0 14和 40 0 72 0 5 4)资助。

摘　　要：通过对华北聚煤盆地几个主要矿区晚古生代煤系中稀土元素的研究 ,发现煤系中 (煤层、煤层顶板、煤层底板、夹矸 )的稀土元素分布复杂 ,不仅受到宏观地质背景的控制 ,而且成煤过程中微环境的变化也对稀土元素的分布影响很大。煤系中稀土元素的共同特征是具有明显的δEu亏损 ,含量的不同是它们的主要差别。煤中稀土元素的含量主要受控于陆源碎屑的供给 ;山西组煤中稀土元素的含量高于太原组 ;山西组煤中稀土元素分布在很大程度上继承了母岩的特征 ;太原组煤中稀土元素的分布和海水的不相似 ,海水对太原组煤中稀土元素的含量和分布模式影响较小 ;岩浆接触变质作用可导致煤中稀土元素分布模式的变化 ,使之趋于岩体稀土元素的分配特征。The study of the rare earth elements (REE) in some Late Paleozoic coals from several coal mines of North China shows that the REE distribution in the coal-bearing strata (coal seams, roofs, footwalls, and partings)is complicated because it is controlled not only by the macro-geological settings but also by the micro-environment during the coal formation. The obvious depletion of δEu seems to be the common character of REE in coal-bearing strata, and their different concentrations constitute the main difference. The REE are mainly supplied by the terrigenous materials, and the concentrations of REE in Shanxi Formation are higher than those in Taiyuan Formation. To a large extent, the REE in coals of Shanxi Formation inherit the modes of occurrence from the parent rocks. The distribution of REE in coals of Taiyuan Formation is not like that in seawater, because the quantitative and distributive influences of the seawater on the REE in coals are not very obvious. The magmatic contact metamorphism might lead to the changes of REE distribution in coals.

关 键 词：晚古生代 稀土元素 华北地区 聚煤盆地 煤 成煤过程 分配模式 

分 类 号：P618.11[天文地球—矿床学]