广西煤的稀土元素分布模式

Rare-earth Element Distribution Patterns of Coals in Guangxi

关键词:  稀土元素  地球化学  煤

Key words:  rare-earth elements  geochemistry  coal

摘要:

广西不同产地、不同时代、不同煤种的煤灰稀土元素分析结果表明,未变质煤的球粒陨石标准化图呈右倾斜"V"型曲线,北美页岩标准化图呈近水平直线,煤中稀土元素没有发生分离和迁移。区域变质煤的球粒陨石标准化图呈右倾斜的"V"型曲线,煤中稀土元素受后期热水溶液影响发生轻微迁移,向富重稀土方向演化。热液变质煤中稀土元素发生了强烈的分离和迁移;煤变质程度越高,时代越早,煤中稀土元素的分离和迁移就越强烈。

Abstract:

Ashes of the coals with different ages and coal ranks from different localities of Guangxi were analysed for their rare-earth elements. The chondrite-normalized diagram of unmetamorphosed coal shows a v-shaped curve inclining towards the right. The north American shale normalized diagram shows nearly a level straight line. No fraction and migration occurred for the rareearth elements in the coal. The chondrite-normalized diagram of regional metamorphosed coal also shows a v-shaped curve inclining towards the right. The rare-earth elements in the coal migrated,to a certain extent, towards enriching heavy rare-earth elements because of being affected by hot water solution in late stage. The rare-earth elements of hydrothermal-metamorphosed coal fractionized and migrated strongly. and their fraction and migration were positively proportional to the metamorphic degree and ages of the coal.