黔东凯里梁山组煤层及其底板中镓的富集与地质成因

采用测试鉴定与地质分析相结合的方法，对贵州凯里下二叠统梁山组煤层柱状剖面上镓的分布状况、赋存状态和地质成因进行了研究．发现样品中镓的加权平均含量超过边界品位，并在煤层下部和底板岩石中显著富集，其主要地质载体为硬水铝石．认为镓主要来源于研究区东侧雪峰古陆石炭统岩石的表生风化作用产物，随风化壳中氢氧化铝呈胶体形式被搬运至泥炭沼泽或沉积水体；较高盐度、较高碱度和较强还原性的沉积水介质条件，是镓相对富集的重要地质原因．

Gallium Accumulation and Geological Controls in Coal Seam and Its Floor from Liangshan Formation,Kaili, Eastern Guizhou, China

Using the method of instrument testing and identification in combination with geological analysis, the distribution, occurrence and geological controls of the gallium in the coal seam column profile from Lower Permian Liangshan formation, Kali, eastern Guizhou, were studied. It was discovered that the gallium is more than marginal grade in content and enriched in lower coal seam and floor, and occurs mainly in diaspore. It was suggested that the gallium was derived from the supergene weathering products from the Carboniferous rocks in the ancient Xuefeng land where located at the eastern side of the Kaili district, which was transported into the ancient peat bog or sedimentary water body with the aluminum hydroxide in the weathering crust as a colloid. The sedimentary water medium with higher salinity, alkalinity and deoxidizing degree could be propitious to the relative accumulation of the gallium.