铜川矿区5#煤层夹矸的地球化学特征

铜川矿区５ ＃ 煤层中的高岭石泥岩夹矸是由酸性火山灰在近地表的成煤条件下经酸性水淋滤、蚀变而成的。在蚀变过程中，那些在表生条件下不稳定或较不稳定的元素大量流失，而那些稳定或较稳定元素则很少流失或相对富集。夹矸的原始组分及粒度大小是造成同一夹矸层中不同夹矸类型间元素含量差异的主要原因。

GEOCHEMICAL FEATURE OF TONSTEIN IN SEAM 5# OF TONGCHUAN COAL DISTRICT

The kaolinite tonstein in the seam 5 # is formed by acidic ash alterated in the acid medium in peat bog in tongchuan district.In the course of alteration,the unstable elements in supergene zone are leached out in quantity,but the stable ones are relatively enriched.The original matter of the tonstein and its grain size are main reason for that the different textures of the tonstein are of different element contents in the same bed.