鄂尔多斯盆地环县地区直罗组铀成矿条件分析
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摘要
文章通过对鄂尔多斯盆地环县地区钻探验证施工,运用岩心观察、岩石薄片鉴定、综合资料对比分析等方法,对该地区砂体铀矿化特征、铀成矿条件,氧化带分布特征研究,结果表明该地区铀矿化砂体在直罗组底部发育,砂体厚度整体稳定连续,呈东北-西南向厚,西北-南东薄,在该区东北角,砂体消失,厚度0-30m不等,平均厚度在20m左右,砂体埋深在444m-825m,砂体整体展布为北高南低,在原峁背斜部位凸起特征。自然伽玛异常的钻孔基本出现在氧化还原的过渡位置,该区直罗组底部砂体的氧化特征与铀聚集有一定的相关性。
Through drilling verification and construction in Huanxian area of Ordos Basin, this paper studies the characteristics of uranium mineralization, uranium metallogenic conditions and distribution characteristics of oxidation zone in this area by means of core observation, rock slice identification, comprehensive data comparative analysis and so on. The results show that the uranium mineralized sand body in this area is developed at the bottom of Zhiluo formation, and the thickness of the sand body is stable and continuous as a whole, which is northeast to southwest and thin from northwest to southeast. In the northeast corner of the area, the sand body disappears, the thickness ranges from 0 m to 30 m, and the average thickness is about 20 m. The buried depth of the sand body is 444 m to 825 m, and the whole sand body is high in the north and low in the south. The drilling holes of natural gamma anomalies basically appear in the transitional position of redox, and the oxidation characteristics of sand bodies at the bottom of Zhiluo formation in this area are related to the accumulation of uranium to a certain extent.
Through drilling verification and construction in Huanxian area of Ordos Basin, this paper studies the characteristics of uranium mineralization, uranium metallogenic conditions and distribution characteristics of oxidation zone in this area by means of core observation, rock slice identification, comprehensive data comparative analysis and so on. The results show that the uranium mineralized sand body in this area is developed at the bottom of Zhiluo formation, and the thickness of the sand body is stable and continuous as a whole, which is northeast to southwest and thin from northwest to southeast. In the northeast corner of the area, the sand body disappears, the thickness ranges from 0 m to 30 m, and the average thickness is about 20 m. The buried depth of the sand body is 444 m to 825 m, and the whole sand body is high in the north and low in the south. The drilling holes of natural gamma anomalies basically appear in the transitional position of redox, and the oxidation characteristics of sand bodies at the bottom of Zhiluo formation in this area are related to the accumulation of uranium to a certain extent.
引文
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[2]马永辉.甘肃环县西部地质构造及控煤作用[J].煤田地质与勘探,2010,38(4):12-15.
[3]曹惠锋,刘厚宁,王军礼,等.鄂尔多斯盆地南缘双龙铀矿成矿特征初步探讨[J].东华理工大学学报(自然科学版),2019,42(1):1-7.
[4]刘化清,廖建波,房乃珍,等.鄂尔多斯盆地环县地区长6沉积体系展布特征[J].沉积学报,2005,23(4):584-588.
[5]杨君,王善博,刘飞.鄂尔多斯盆地西缘环县地区直罗组沉积相及其与铀矿化的关系[J].科学技术与工程,2019,19(17):64-70.
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