新疆哈密大南湖地区层间氧化带特征研究

新疆大南湖地区的层间氧化带发育层位为中侏罗统西山窑组第二、三岩性段砂砾岩,以褐黄色为主;层间氧化带具多层性,埋深31～343 m,厚度2～138 m;层间氧化带分为氧化带、氧化-还原过渡带和原生带;铀矿体主产于氧化-还原过渡带中;新构造运动形成的最终构造格架控制了层间氧化带的发育方向和基本形态,不同粒度且非致密结构的砂砾岩和冲积扇相、辫状河相沉积则决定层间氧化带发育的厚度和规模,由南向北流的承压地下水造成区内层间氧化带前锋线呈向北延伸的趋势.

THE STUDY ON INTERLAYER OXIDIZATION ZONE IN DANANHU AREA OF XINJIANG

The interlayer oxidation zone are mainly in brownish yellow color and multi-layers developed in the sandy conglomerate of the second and third lithologic members of Xishan formation of Middle Jurassic Series.The interlayer oxidation zone is composed of oxidation zone,transitional zone from the oxidation to reduction and the primary ore zone.They are 2-138m thick buried at depth of 31-343m.The uranium ore body occurs in the transitional zone.The structural frame formed during the neotectonic movement controls direction of the oxidation zones and their morphology.Variant grain and incompact texture of the sandy conglomerate and alluvial fan and the sedimentary phase of braided river channel control the thickness and size of the oxidation zone and the flowing from south to north of the confined water leads the northward extension of the front of the oxidation zone.