氡气测量在寻找隐伏铀矿体中的应用——以新疆杰别特地带为例
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摘要
随着铀矿的发展和地表勘探工作的不断深入,在覆盖层较厚的地区,靠传统的追索地表矿化露头信息和测量伽马总量的组合方法,寻找大规模的铀矿已变得越来越难,而以氡气测量为主的深部勘探方法正逐渐被广泛应用。以新疆杰别特地区氡气测量为例,介绍氡气测量方法的理论基础及运移机制,对实测土壤氡活度浓度数据进行正态化变换处理,在二维平面趋势面分析的基础上建立带地形的三维趋势面模型。结果表明,三维趋势面提取剩余异常信息明显优于二维趋势面分析效果,从而为划定深部铀矿有利远景区提供有利依据。
With the continuous development of uranium exploration on surface, it is more and more difficult to find large-scale uranium deposits by the combination method of traditionally surface outcrop tracing and gamma survey the thick overburden area. However, the radon measurement based on deep exploration theory is used wide and wide. Radon survey was carried out in Jiebiete area of Xinjiang as an example, this paper introduces its theoretical basis and migration mechanism, process of measured solid radon activity, concentration data by normalized transformation, and establishes 3 D terrain trend surface model on the basis of two-dimensional trend surface. The results showed that the residual anomaly information extracted from 3 D trend surface is much better than the analysis results of two-dimensional trend surface, which can provide a favorable basis for finding out concealed structure and delineating prospective area for deep uranium exploration.
With the continuous development of uranium exploration on surface, it is more and more difficult to find large-scale uranium deposits by the combination method of traditionally surface outcrop tracing and gamma survey the thick overburden area. However, the radon measurement based on deep exploration theory is used wide and wide. Radon survey was carried out in Jiebiete area of Xinjiang as an example, this paper introduces its theoretical basis and migration mechanism, process of measured solid radon activity, concentration data by normalized transformation, and establishes 3 D terrain trend surface model on the basis of two-dimensional trend surface. The results showed that the residual anomaly information extracted from 3 D trend surface is much better than the analysis results of two-dimensional trend surface, which can provide a favorable basis for finding out concealed structure and delineating prospective area for deep uranium exploration.
引文
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[2]赵春江.地气测量结合现场物化探方法勘查隐伏金属矿研究[D].成都:成都理工大学,2013.
[3]刘菁华,王祝文,王晓丽,等.氡气测量在佳木斯城市地下热水普查的应用[J].地球科学与环境学报,2009,31(1):75-78.
[4]王霆.核地球物理方法在铀矿勘查中的应用[D].北京:中国地质大学,2011.
[5]Kristiansson K,Malmqvist L.Evidence for nondiffusive transport of 86 Rn in the ground and a new physical model for the transport[J].Geophysics,1982,47(10):1 444-1 452.
[6]Vogel J C,Talma A S,Heaton T H E,et al.Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer[J].Journal of Geochemical Exploration,1999,66(1):269-276.
[7]乐仁昌,贾文懿.氡运移实验研究与氡团簇运移机理[J].辐射防护,2002,22(3):175-181.
[8]王平,李舟波,戴丽君.油田放射性异常成因研究[J].地球物理学报,1995,38(4):528-538.
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