华北石炭二叠纪煤层含铵云母粘土岩夹矸研究

STUDY ON TOBELITE-BEARING TONSTEINS OF CARBONIFEROUS-PERMIAN COAL MEASURES IN NORTH CHINA

含铵云母粘土岩夹矸较广泛分布于华北石炭二叠纪聚煤区太原组及山西组煤层中，其可划分为６种类型。文章详细描述了岩石的特征和铵云母在粘土岩夹矸中的赋存特点。测试结果表明铵云母均为１Ｍ型铵云母。它们是由成煤植物和有机质降解形成的ＮＨ４＋离子，促使煤层粘土岩夹矸中的高岭石、伊利石在约１２０℃的酸性条件下转化成的。这种铵云母可以作为煤成气生成和储集的指示矿物。

he tobelite-bearing tonsteins are more widely distributed in the coal beds of Taiyuan and Shaxi Formation of .the Carboniferous-Permian coal mersures in Northern China,can be divided into the six rock types. Their lithological features and occurrences characteristices of the tobelites in the tonsteins are described in detail. The analytical results show that the tobelites are I M type. The tobelites are formed by alternating Kaolinite and Illite in the tonsteins under the effect of NH4+ formed by the degradation of coal forming plants and other organic substances, under the condition of acid medium, below 120℃. The tobelite can be regarded as a index mineral which forms and reserves the coal bed gas.