吐哈盆地十红滩铀矿床北矿带钙质砂岩分布特征及其对地浸开采影响  

Calcareous Sandstone Distribution Features and Its Impact on In-situ Leaching of Uranium Exploitation in North Ore Belt of Shihongtan Uranium Deposit,Turpan-Hami Basin

作　　者：杨冰彬 乔海明 刘治国 伍群 Yang Bingbin;Qiao Haiming;Liu Zhiguo;Wu Qun(No.203 Research Institute,China National Nuclear Corporation,Xi’an,Shaanxi 710086)

机构地区：[1]核工业二〇三研究所,西安710086

出　　处：《中国煤炭地质》2022年第7期16-21,共6页Coal Geology of China

基　　金：中央财政铀矿地质勘查项目(202218、202116-2),国家自然科学基金项目(41562006)。

摘　　要：砂岩型铀矿中矿石和围岩的矿物成分是影响地浸过程的主要因素,十红滩铀矿床钙质砂岩呈矿石和围岩两种形式产出。根据野外地质剖面观察、钻孔编录和薄片镜下鉴定,十红滩北矿带含矿层钙质层主要是由碳酸盐胶结碎屑颗粒形成的;含矿层赋存1~9层钙质层,产出形态多为串珠状透镜体或不规则团块状、顺层理或是裂隙发育,厚度多为0.5~1m,表现为单层厚度薄、层数变化大等;致密钙质砂岩中CO_(2)平均含量为9.18%,较疏松砂岩CO_(2)平均含量为6.02%,疏松砂岩(CO_(2)>2%)平均含量为2.45%;钙质砂岩具有两期成因,即成岩阶段和后生蚀变作用形成的钙质砂岩。北矿带钙质层的存在影响了矿层的渗透系数,导致北矿带难以采用酸法进行地浸开采。The mineralogical composition of ore and country rock in sandstone type uranium deposit is the main factor impacting in-situ leaching process.Calcareous sandstone in the Shihongtan uranium deposit presents ore and country rock two forms.Based on field geological section observation,borehole data editing and thin section microscopic identification,caliche in Shihongtan north ore belt ore-bearing bed is formed by carbonate cemented clastic particles.Ore-bearing bed has hosted 1~9 layers of caliche,produced forms are mostly moniliform lens or irregular lumps,bedding or along fissures developed,with thickness mostly 0.5~1m and presented single layer thin,layer number variated features,CO_(2) average content in compact calcareous sandstone is 9.18%,in sub-loosened sandstone 6.02%,in loosened sandstone(CO_(2)>2%)2.45%.Calcareous sandstone has two staged geneses,i.e.diagenetic stage formed and epigenetic alteration formed.Caliche existed in north ore belt has impacted ore bed filtration coefficient,thus north ore belt is difficult to adopt acidic process to carry out in-situ leaching exploitation.

关 键 词：北矿带 钙质砂岩 地浸 十红滩 

分 类 号：P619.14[天文地球—矿床学]