伊宁矿区北区西山窑组煤中稀土元素地球化学特征Geochemistry Characteristics of Rare Earth Elements in Xishanyao Formation Coal from North Yining Mining Area
孟瑞艳,毛礼鑫,朱士飞,秦云虎,刘威
摘要(Abstract):
煤中稀土元素具有重要的地质环境指示作用,也是潜在的稀土矿产接替资源。在伊宁矿区北区采集了西山窑组4个主采煤层的煤样进行了煤质与稀土元素地球化学测试分析。结果表明,西山窑组煤具有低灰、低硫、高挥发分、高发热量的特点,煤灰组分以Si、Al、Ca、Mg氧化物为主;煤中稀土元素含量为4.48~36.52μg/g,低于煤层顶板(36.68~191.35μg/g),其中7~#、6~(-2#)煤中稀土元素含量较低,为平坦型,具有Ce负异常;6~(-1#)、5~#煤中稀土元素含量较高,为左倾型,具有Ce轻微负异常、δEu略小于1的特点;煤中稀土元素与中酸性岩浆岩有关,以黏土矿物吸附的形式赋存。综合分析认为西山窑组沉积时期气候干热、以氧化环境为主,水深由7~#煤层到5~#煤层变浅,陆源碎屑对煤层成分影响较大。
关键词(KeyWords): 稀土元素;地球化学;沉积环境;伊北矿区
基金项目(Foundation): 2023年度江苏省碳达峰碳中和科技创新专项(BE2023855);; 江苏省地质学会课题(JSDZXH-P2024-06);; 徐州市科技局科技专项(KC23073、KC23120);; 江苏地研院科技专项(JSY-2024-J01-1)
作者(Author): 孟瑞艳,毛礼鑫,朱士飞,秦云虎,刘威
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