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Delineation of Heavy Mineral Bearing Placers by Electrical Resistivity and Radiometric Techniques Along Coastal Odisha, India
Pure and Applied Geophysics ( IF 2 ) Pub Date : 2020-05-26 , DOI: 10.1007/s00024-020-02502-3
Shayantani Ghosal , Akarsh Singh , Sudha Agrahari , Debashish Sengupta

The distribution of heavy minerals in the beach placer deposits of the eastern coastal areas of India is investigated using electrical resistivity and radiometric methods. A combination of electrical resistivity and radioactivity measurement techniques was utilized for the first time to delineate heavy mineral bearing zones along the beach. The objective of this study was to delineate the spatial and vertical extension and also to locate the existence of concealed pockets of heavy minerals. A total of seven resistivity and radioactivity profiles, both parallel and perpendicular to the coastline, were measured. The radiometric measurements were performed both in the field and in the laboratory using a portable Geiger-Müller (GM) counter and a high-purity germanium detector (HPGe), respectively. A zone with inverted resistivity values from 0.1 to 1.1 Ωm and depths extending to approximately 20 m from the surface was interpreted as the heavy mineral bearing zone. The surficial exposures of heavy mineral bearing placers were located by integrating the results of the resistivity and radiometric techniques. The zones with high conductivity and high radioactivity values were identified as the heavy mineral bearing placers containing monazite. Good agreement was observed between the resistivity and the radioactivity data for the very shallow deposits of heavy mineral placers. In general, the area shows a patchy distribution of heavy minerals along the coast.

中文翻译:

用电阻率和辐射技术沿印度奥里萨邦海岸划定重矿物轴承砂轮

使用电阻率和辐射测量方法研究了印度东部沿海地区海滩砂矿沉积物中重矿物的分布。首次利用电阻率和放射性测量技术的组合来划定沿海滩的重矿物承载区。这项研究的目的是描绘空间和垂直延伸,并确定是否存在隐藏的重矿物口袋。总共测量了 7 个与海岸线平行和垂直的电阻率和放射性剖面。辐射测量分别在现场和实验室中使用便携式 Geiger-Müller (GM) 计数器和高纯锗探测器 (HPGe) 进行。具有从 0.1 到 1 的反转电阻率值的区域。1 Ωm 和从地表延伸到大约 20 m 的深度被解释为重矿物承载区。通过综合电阻率和辐射测量技术的结果,确定了含重矿物砂矿的表面暴露位置。具有高电导率和高放射性值的区域被确定为含有独居石的重矿物砂矿。在非常浅的重矿物砂矿沉积物的电阻率和放射性数据之间观察到良好的一致性。总体而言,该地区的重矿物沿海岸呈片状分布。通过综合电阻率和辐射测量技术的结果,确定了含重矿物砂矿的表面暴露位置。具有高电导率和高放射性值的区域被确定为含有独居石的重矿物砂矿。在非常浅的重矿物砂矿沉积物的电阻率和放射性数据之间观察到良好的一致性。总体而言,该地区的重矿物沿海岸呈片状分布。通过综合电阻率和辐射测量技术的结果,确定了含重矿物砂矿的表面暴露位置。具有高电导率和高放射性值的区域被确定为含有独居石的重矿物砂矿。在非常浅的重矿物砂矿沉积物的电阻率和放射性数据之间观察到良好的一致性。总体而言,该地区的重矿物沿海岸呈片状分布。
更新日期:2020-05-26
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