山西阳泉三矿煤层粘土岩夹矸地球化学特征

采用化学法和中子活化(INAA)法对采自山西阳泉三矿山西组3号煤层和太原组12号煤层的3件煤层夹矸粘土岩样品的8种常量元素(氧化物)和33种微量元素含量进行了测定。通过对具有示踪意义的元素及其比值的对比分析,3个样品总体上均不具有典型的沉积岩特征,应该是由酸性或酸性偏碱性火山物质(降落的或陆源搬运的)在地表覆水较浅的弱氧化条件下经原地淋滤、蚀变形成的。原岩蚀变程度较高,不稳定或较不稳定的元素大量流失,甚至一些较稳定的元素(如高岭岩中的铁、锰)也明显流失。强烈的化学蚀变以及岩石中矿物成分的变化是造成粘土岩间以及粘土岩与原岩间元素(尤其是REE)含量及REE配分模式差异的主要原因。

Geochemistry of clay parting in No.3 coal mine of Yangquan Coal Co. Ltd of Shanxi Province

The contents of the major and trace elements in 3 samples of the claystones from the coal measures of Taiyuan and Shanxi Formations of Permo-Carboniferous in No.3 coal mine of Yangquan Coal Co. Ltd of Shanxi province have been detected by chemical analysis and INAA respectively. By the contrast analysis to the elements with geochemical tracer and their ratio, the three samples, on geochemistry as a whole, are not of the typical characteristics of sedimentogenic mudstone, and could be formed in situ from the alteration of acidic or alkali-acidic ash (fallout or water-carried) under the conditions of the shallower water and weak oxidation on the surface. The alteration of the claystone is stronger on the whole, and it causes much loss of the unstable elements, even some of the more stable elements, such as ferromolybdenum and manganese. The strong alteration of the original matters, as well as the change of mineral composition in the rocks is the major reason to result in the differences between clay rocks, and clay rock and its original matter on the element contents and the REE patterns.