松辽盆地青山口组二、三段沉积特征及铀成矿分析

Analysis on Sedimentary Characteristics and Uranium Mineralization Conditions of the Second and Third Members of Qingshankou Fm in Songliao Basin

钻孔揭露了松辽盆地双山地区青山口组二、三段地层,以盆地沉积学方法为基础,从沉积层物源、地层、碎屑物沉积方式(沉积相)、古流向等方面对青山口组二、三段进行了分析。结果表明,青山口组二、三段在双山地区沉积相序上经历了冲积扇相-河流相的演化过程,且砂体较为发育,具有稳定的泥-砂-泥结构,为铀成矿流体提供了有利的运移及存储空间。结合青山口组二、三段砾石成分、砂岩组分和古水流等分析,确定主要物源供给区,并结合本地区的沉积特点,对青山口组研究区铀成矿条件进行了分析。

The drilling revealed the second and third members of Qingshankou Fm in Shuangshan area of Songliao basin.Based on basin sedimentology method,the second and third members of Qingshankou Fm were analyzed in terms of the strata,sedimentary facies,provenance and palaeocurrent.The results show that the second and third members of Qingshankou Fm in the areas of sedimentary facies in this sequence has paid the evolution process of alluvial fan facies,fluvial facies,and sand body development,has the stable mud-sand-mud structure,for uranium ore-forming fluid provides favorable migration and storage space.Based on the analysis of gravel composition,sandstone composition and palaeocurrent in the second and third members of Qingshankou Fm,the main provenance supply area was determined,and the uranium mineralization conditions in the study area were analyzed in combination with the sedimentary characteristics of this area.