新疆伊犁盆地南缘洪海沟煤岩型铀矿控矿因素研究

Ore-control factors of Honghaigou coal type uranium deposit in the southern margin of Yili Basin,Xinjiang

伊犁盆地南缘的洪海沟矿床是近年来发现的大型煤岩型、砂岩型铀矿床。针对煤岩型铀矿在煤层中富集因素研究较少,该文通过对洪海沟铀矿床层间氧化带特征与第十二煤层的空间分布关系,以及煤层的厚度、顶板岩性变化,煤层的变质程度及聚煤期后的构造运动对铀富集的影响,认为洪海沟铀矿床煤岩型铀矿属于层间氧化带铀矿床,受层间氧化带控制作用明显,铀矿化主要发育在层间氧化带内侧,薄—中等厚度的煤层、砂岩顶板直接与煤层接触、低变质程度及聚煤期后的稳定抬升构造运动更有利于铀矿体的富集。

The Honghaigou deposit in the southern margin of Yili Basin is a large-scale coal and sandstone type uranium deposit discovered in recent years.In view of the less research on the enrichment factors of coal type uranium deposits in coal seams,this paper studies the relationship between the characteristics of interlayer oxidation zone of Honghaigou uranium deposit and the spatial distribution of the Twelfth Coal Seam,as well as the variation of the thickness and roof lithology of the coal seam,it is considered that the coal-rock type uranium deposit in Honghaigou uranium deposit belongs to the interlayer oxidation zone uranium deposit,which is controlled by the interlayer oxidation zone,uranium mineralization is mainly developed in the inner interlayer oxidation zone.The thin to medium thickness coal seam and sandstone roof are in direct contact with coal seam,the low metamorphism degree and the stable uplift movement after coal accumulation period are more favorable for uranium ore body enrichment.