Exploration Geophysics Exploration Geophysics Society
Journal of the Australian Society of Exploration Geophysicists
RESEARCH ARTICLE

Near-surface high resolution imaging of a metallogenic zone in the northern fringe of Dalma volcanics in eastern India using electrical resistivity tomography

P. K. Adhikari 1 P. K. Yadav 2 Shalivahan Srivastava 2 3 Ved P. Maurya 2 Shailendra Singh 2 Anurag Tripathi 2 Roshan K. Singh 2 Ashish K. Bage 2
+ Author Affiliations
- Author Affiliations

1 Uranium Corporation of India Limited, Jaduguda, East Singhbhum 832102, India.

2 Centre of Advanced Study, Department of Applied Geophysics, Indian School of Mines, Dhanbad, Jharkhand 826004, India.

3 Corresponding author. Email: svismagp@gmail.com

Exploration Geophysics 48(4) 394-400 https://doi.org/10.1071/EG15078
Submitted: 19 August 2015  Accepted: 22 April 2016   Published: 2 June 2016

Abstract

Electrical resistivity tomography (ERT) is a useful tool to map near-surface conducting anomalies. The detailed ERT survey was taken over an already defined conducting zone on a regional scale through a magnetotelluric (MT) survey, in order to provide better resolution of the subsurface structure within the study area. The survey lines were carried out crossing the delineated conducting zone through MT giving a dense coverage over the area. The ERT survey were carried out along 15 lines covering an area of ~1 km2 with a line spacing of ~50 m in the northern fringe of the Dalma volcanics (DVs). The study utilised the 61-channel cum 64-electrode resistivity equipment, FlashRES-Universal ERT multi-electrode data acquisition system, developed by ZZ Resistivity Imaging, Australia. Data has been acquired both through conventional arrays i.e. Wenner, Schlumberger and ZZ unconventional arrays. Inversion of the data set have been performed using 2.5D finite element conjugate gradient algorithm after performing the quality check. Resistivity models along all the lines were obtained using Wenner, Schlumberger and combination of Wenner, Schlumberger and ZZ arrays. Resistivity models resolved four major zones: (1) resistivity less than 1 Ωm; (2) resistivity 1–10 Ωm; (3) resistivity 10–100 Ωm; and (4) resistivity more than 100 Ωm . The resistivity results corroborate well with the geological succession from the drilling data. The conducting zones with resistivity values ranging from 1–10 Ωm correlates with the Lower Dalma volcanics while the Upper Dalma volcanics corresponds to the regions with resistivity values of less than 1 Ωm. The Upper Dalma volcanics corresponds to the metallogeny while the depth to the top of the ore body is ~25 m.

Key words: Dalma volcanics, ERT, metallogeny, VMS, ZZ array.


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