平庄盆地六家立井地区找铀目标层岩石学特征及其找矿意义

Lithologic Features and Significance of Uranium Target Zone in Liujia Vertical Shaft Area,Pingzhuang Basin

六家立井地区位于平庄盆地北缘,白垩系下统阜新组上段是该区砂岩型铀矿床目标层位,具有较好找铀前景。为深入了解该区砂体的岩石学特征,通过野外钻探工作、岩心编录、样品采集及岩矿测试方法,详细研究了目标层碎屑岩类型、碎屑岩成分、结构构造等岩石学方面特征。结果表明目标层碎屑岩成分成熟度和结构成熟度均较低,具有搬运距离短、沉积速度快的特点,其物源较单一,初步判断物源来自盆地东北部和西北部隆起带酸性花岗岩,同时也为铀成矿提供了良好的铀源。

The Liujia vertical shaft area is situated in the northern Pingzhuang Basin, the Upper Member of lower Cretaceous Fuxin Formation is the sandstone type uranium target zone with better prospecting prospect. To understand the area’s sandstone lithologic features in-depth, through field drilling, core logging, sample acquisition, rock and mineral testing, have studied lithologic features of target zone clastic rock type, component, texture and structure in detail. The result has shown that the component maturity and texture maturity of clastic rocks in the target zone are rather low with characteristics of short transportation distance, quick depositional velocity. The provenance material is relatively simple, initially considered that the material is acidic granite from northeastern and northwestern uplift zone provenances of the basin, simultaneously provided good uranium source for metallization.