纳米比亚欢乐谷钙结岩型铀矿区放射性测量方法对比
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- 英文论文题名：Comparison of radiometric methods in exploration for calcrete-type uranium deposits in Gaudeanmus area,Namibia
- 论文作者：柯丹 ; 王勇 ; 吴国东 ; 宋亮 ; 刘洪军
- 英文论文作者：KE Dan ; WANG Yong ; WU Guo-dong ; SONG Liang ; LIU Hong-jun ; Beijing Research Institute of Uranium Geology ; CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology
- 年：2015
- 作者机构：核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室;
- 论文关键词：纳米比亚 ; 钙结岩型铀矿 ; 放射性方法 ; 氡气测量
- 英文论文关键词：Namibia ; calcrete-type uranium deposit ; radiometric survey ; radon measurement
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第1册（铀矿地质分卷、铀矿冶分卷）
- 语种：中文
- 分类号：P619.14
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：5
- 文件大小：820k
- 原文格式：O
- 会议级别：全国
摘要
在纳米比亚欢乐谷地区南部钙结岩型铀矿区已经发现的铀矿体面积约为3 km~2,仅占整个钙结岩覆盖区面积的6%左右。在矿区内已知剖面上开展了土壤氡气测量、地面伽马能谱测量、天然热释光测量和土壤~(210)Po测量等常用放射性物化探测量方法对比试验。结果表明,钙结岩型铀矿体上方的氡气浓度表现为多峰异常;地面伽马能谱铀含量整体上较为平缓,在矿体上方没有明显的异常;土壤天然热释光强度在铀矿体的上方同样表现为多峰异常,最高的异常峰与铀矿体有数十米的偏移;土壤~(210)Po含量在矿体上方也没有明显的异常。因此认为,土壤氡气测量对钙结岩型铀矿化的指示作用是最明显的,其次是土壤天然热释光测量方法,土壤~(210)Po测量和地面伽马能谱测量方法则没有明显效果。利用活性炭吸附测氡方法在未知区发现了面积近5 km~2的氡气异常,经地质槽探揭露,发现了较好的钙结岩型铀矿化。
Calcrete-type deposit found in Gaudeanmus area in Namibia is hosted in the calcrete with of area of about 3 square kilometers,which is only 6%of the whole calcrete-coverd area.Several radiometric techniques,including soil radon measurement,ground gamma-ray spectrum measurement,natural thermo luminescence of soil and measurement of polonium-210 in soil are carried out,aiming at evaluating the effectiveness of them in detection of uranium mineralization.The typical response of radon concentration to uranium mineralization appears to be multi-peak anomalies,while the ground gamma-ray spectrum measurement show no clear anomalies.Results of the natural thermo luminescence of soil over the uranium mineralization area is also demonstrated as multi-peak anomalies,but there is a displacement of dozen of meters from the exact location of the ore body.The concentration of polonium-210 also appears no significant anomalies over the uranium mineralization.In conclusions,among the radiometric methods mentioned above,the radon measurement is the most effective in the indication of calcrete-type uranium mineralization,and followed by the natural thermo luminescence of soil.Measurement of polonium-210 and ground gamma-ray spectrum have no obvious effectiveness.Based on radon measurement results,anomaly with a area of about 5 square kilometers is delineated and uranium mineralization are discovered by geological trenching.
Calcrete-type deposit found in Gaudeanmus area in Namibia is hosted in the calcrete with of area of about 3 square kilometers,which is only 6%of the whole calcrete-coverd area.Several radiometric techniques,including soil radon measurement,ground gamma-ray spectrum measurement,natural thermo luminescence of soil and measurement of polonium-210 in soil are carried out,aiming at evaluating the effectiveness of them in detection of uranium mineralization.The typical response of radon concentration to uranium mineralization appears to be multi-peak anomalies,while the ground gamma-ray spectrum measurement show no clear anomalies.Results of the natural thermo luminescence of soil over the uranium mineralization area is also demonstrated as multi-peak anomalies,but there is a displacement of dozen of meters from the exact location of the ore body.The concentration of polonium-210 also appears no significant anomalies over the uranium mineralization.In conclusions,among the radiometric methods mentioned above,the radon measurement is the most effective in the indication of calcrete-type uranium mineralization,and followed by the natural thermo luminescence of soil.Measurement of polonium-210 and ground gamma-ray spectrum have no obvious effectiveness.Based on radon measurement results,anomaly with a area of about 5 square kilometers is delineated and uranium mineralization are discovered by geological trenching.
引文
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[7]许军才,黄临平,刘庆成,等.土壤天然热释光法在相山火山岩型铀矿床中的应用[J].物探与化探,2005,29(3):224-226.
[8]陈金勇,范洪海,陈东欢,等.纳米比亚欢乐谷地区白岗岩型铀矿矿物特征研究[J].地质论评,2013,59(5):962-970.
[9]王生云,范洪海,陈金勇,等.纳米比亚欢乐谷地区斑状花岗岩成因及构造背景[J].世界地质,2013,32(4):773-782.
[2]谈成龙.当今测氡方法及设备面面观[J].世界核地质科学,2003,20(4):213-223.
[3]赵桂芝,肖德涛.土壤氡浓度的测量方法现状[J].核电子学与探测技术,2007,27(3):583-587.
[4]杨亚新,吴雅梅,吴信民,等.应用氡气测量和土壤天然热释光测量推断花岗岩型铀矿含矿部位——以下庄花岗岩型铀矿田为例[J].铀矿地质,2007.23(3):177-181,192.
[5]邱元德,童运福.活性炭法在川北砂岩型铀矿勘探中的应用[J].成都理工学院学报,1996,23(2):113-116.
[6]曹晓满.~(210)Po法在铀矿勘探中的应用效果[J].铀矿地质,2006,22(3):177-181.
[7]许军才,黄临平,刘庆成,等.土壤天然热释光法在相山火山岩型铀矿床中的应用[J].物探与化探,2005,29(3):224-226.
[8]陈金勇,范洪海,陈东欢,等.纳米比亚欢乐谷地区白岗岩型铀矿矿物特征研究[J].地质论评,2013,59(5):962-970.
[9]王生云,范洪海,陈金勇,等.纳米比亚欢乐谷地区斑状花岗岩成因及构造背景[J].世界地质,2013,32(4):773-782.