Modeling and inversion of magnetic and VLF-EM data with an application to basement fractures: A case study from Raigarh, India

V. Ramesh Babu, Subhash Ram, N. Sundararajan

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We present modeling of magnetic and very low frequency electromagnetic (VLF-EM) data to map the spatial distribution of basement fractures where uranium is reported in Sambalpur granitoids in the Raigarh district, Chhattisgarh, India. Radioactivity in the basement fractures is attributed to brannerite, U-Ti-Fe complex, and uranium adsorbed on ferruginous matter. The amplitude of the 3D analytical signal of the observed magnetic data indicates the trend of fracture zones. Further, the application of Euler 3D deconvolution to magnetic data provides the spatial locations and depth of the source. Fraser-filtered VLF-EM data and current density pseudosections indicate the presence of shallow and deep conductive zones along the fractures. Modeling of VLF-EM data yields the subsurface resistivity distribution of the order of less than 100 ohm-m of the fractures. The interpreted results of both magnetic and VLF-EM data agree well with the geologic section obtained from drilling.

Original languageEnglish
JournalGeophysics
Volume72
Issue number5
DOIs
Publication statusPublished - Sep 2007

Fingerprint

very low frequencies
India
basements
inversions
electromagnetism
Uranium
modeling
uranium
brannerite
Radioactivity
Deconvolution
radioactivity
drilling
Spatial distribution
deconvolution
Drilling
fracture zone
spatial distribution
Current density
inversion

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Modeling and inversion of magnetic and VLF-EM data with an application to basement fractures : A case study from Raigarh, India. / Ramesh Babu, V.; Ram, Subhash; Sundararajan, N.

In: Geophysics, Vol. 72, No. 5, 09.2007.

Research output: Contribution to journalArticle

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