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

24 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

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Fingerprint Dive into the research topics of 'Modeling and inversion of magnetic and VLF-EM data with an application to basement fractures: A case study from Raigarh, India'. Together they form a unique fingerprint.

  • Cite this