内蒙古二连盆地哈达图地区层间氧化带产出特征与控矿作用研究  

Characteristics and Ore-controlling Effect of Interlayer Oxidation Zone in Hadatu Area,Erlian Basin,Inner Mongolia

作　　者：苗鹏翼 李满根[1] 张锋 吴金钟 MIAO Peng-yi;LI Man-gen;ZHANG Feng;WU Jin-zhong(East China University of Technology, Nanchang 330013,China;Liaoning Nuclear Power Co. Ltd.,CNNP,Xingcheng 125100,China;Geologic Party No. 208,CNNC, Baotou 014010,China)

机构地区：[1]东华理工大学,江西南昌330013 [2]中核辽宁核电有限公司,辽宁兴城125100 [3]核工业二〇八大队,内蒙古包头014010

出　　处：《东华理工大学学报（自然科学版）》2021年第3期212-223,共12页Journal of East China University of Technology(Natural Science)

基　　金：中国核工业集团有限公司项目(地LCEQ01)。

摘　　要：哈达图地区位于二连盆地乌兰察布坳陷中东部,为巴赛齐古河谷的一部分,在其砂体中发现大型铀矿床。本区氧化带的形成及空间展布有其明显的特征,其控矿作用亦具有独特性。以钻孔资料为依据,结合岩矿芯样品分析测试,对哈达图地区含矿砂体沉积空间展布、沉积相、氧化带发育特征等方面分析研究,指出该地区赋矿层位下白垩统赛汉组上段中层间氧化带受砂体垂向非均质性控制,垂向分带性明显,前锋线位于各亚层界面附近,氧化带在亚层内因砂体均质好,沿河谷延伸距离长,矿体受氧化带垂向前锋线控制呈似层状。铀成矿具长期多次性,且在氧化带持续发育;由于深部还原气体沿构造渗入引起氧化还原过渡亚带酸碱度变化,是形成富铀矿体的关键因素。该研究成果对周边的赛罕塔拉、伊和乌素凹陷找矿具有较好指导意义。Hadatu area is located in the mid-eastern Ulanqab depression in Erlian basin,and is a part of the Ba-Sai-Qi ancient river valley,where a large uranium deposit is discovered in the sand body.The formation and spatial arrangement of oxidation zone in this area shows unique characteristics about the ore control here.Combined the drill data with the analyses of rock and ore core samples,the spatial arrangement,sedimentary facies,development characteristics of oxidation zone and other aspects of the ore-bearing sand deposit in Hadatu area are studied.It is pointed out that the interlayer oxidation zone of the upper member of Lower Cretaceous Saihan formation in the ore-bearing strata of the area is subject to vertical heterogeneous control of the sand body,showing significant vertical zonality;the forwards are near the sublayer interface;the oxidation zone,due to sand body homogeneity in sublayers,stretches long along the valley;the ore body is layered subject to vertical forward control of the oxidation zone.Uranium metallogenesis is long-term and repetitious,with continued development in the oxidation zone.Changes in alkalinity acidity of the oxidation-reduction transition subzone for permeation of reducing gas in the deep are key factors of the formation of uranium-rich ore body.The research results will be good guidances for ore prospecting in Saihantala and Yihewusu depression nearby.

关 键 词：氧化带 铀矿化 控矿因素 哈达图 二连盆地 

分 类 号：P619.14[天文地球—矿床学]