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Abstract

Summary

This paper discusses the use of Controlled Source Audio-frequency Magnetotelluric method (CSAMT) in geological structure exploration at an area preselected for high level radioactive waste (HLRW) in northwest China. The survey objective is to evaluate the rock mass quality and find the weak geological structures which will cause damage to the safety and stability of underground repository. We conducted a dense CSAMT survey, combined with borehole information to delineate the local weak geological structures. The study was conducted in NW China in 2014. The comparison between the interpreted results and geologic information shows that both are in agreement. The preliminary results offer detailed information about the electrical structures of Nuorigong rock mass from the surface to 1400 m deep, so the interrelationship between the target rock mass and its surroundings were analyzed to show their shapes. In conclusion, CSAMT results are helpful in exploring the subsurface for geological structures and competent rock mass. It can also provide the reliable geophysical evidence and scientific reference for complete and consistent evaluation of the deep geological structures, and aid in comprehensive assessment of preselected sites for HLRW disposal, such as further study in the design and construction of an underground man-made repository.

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/content/papers/10.3997/2214-4609.201800354
2018-04-09
2024-04-20
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References

  1. An, Z. G., and Di, Q. Y.
    , 2016, Investigation of geological structures with a view to HLRW disposal, as revealed through 3D inversion of Aeromagnetic and Gravity data and the results of CSAMT exploration: Journal of Applied Geophysics, 135, 204–211.
    [Google Scholar]
  2. An, Z. G., Q. Y.Di., C. M.Fu., et al.
    , 2013, Geophysical evidence of the deep geological structure through CSAMT survey at a potential radioactive waste site at Beishan, Gansu, China: Journal of Environmental and Engineering Geophysics, 18, No.1, 43–54.
    [Google Scholar]
  3. An, Z. G.,, Q. Y.Di., R.Wang., et al.
    , 2013, Multi-geophysical investigation of geological structures in a pre-selected high-level radioactive waste disposal area in northwestern China: Journal of Environmental and Engineering Geophysics, 18, No.2, 137–146.
    [Google Scholar]
  4. Feng, J. Y., W. J.Xiao, B.Windley, et al.
    , 2013, Field geology, geochronology and geochemistry of mafic–ultramafic rocks from Alxa, China: Implications for Late Permian accretionary tectonics in the southern Altaids: Journal of Asian Earth Sciences, 78, 114–142.
    [Google Scholar]
  5. Lin, L. N., W. J.Xiao, B.Wan, et al.
    , 2014, Geochronologic and geochemical evidence for persistence of south-dipping subduction to late Permian time, Langshan area, Inner Mongolia (China): Significance for termination of accretionary orogenesis in the Southern Altaids: American Journal of Science, 314, 679–703.
    [Google Scholar]
  6. Torres-Verdín, C., and F. X.Bostick
    , 1992, Principles of spatial surface electric field filtering in magnetotellurics: Electromagnetic Array Profiling (EMAP), Geophysics, 57, No.4, 603–622.
    [Google Scholar]
  7. Wang, J., G. Q.Xu, Y. X.Jin, et al.
    , 2000, Study on regional crustal stability of Beishan, Gansu province: Geology press(in Chinese).
    [Google Scholar]
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