Identification of fault zones within an orebody using a set of geophysical methods

Authors: Bazhenova E.A.

The article discusses the results of complexing of land works and downhole geophysical surveys in the area of an iron ore deposit. The research undertaken at the North Taratash site was aimed to detect and estimate the geodynamic activity of disjunctive faults within the boundaries of Kuvatal occurrence of magnetite quartzite. The borehole surveys included recording of geoacoustic emission and electromagnetic radiation. The land works package consisted of areal magnetometry, hand-held gamma-radiation survey and radon measurements. The geoacoustic emission and electromagnetic radiation data analysis reveals the anomalies conditioned by the proximity to faults. The frequency ranges of signals of geoacoustic emission and electromagnetic radiation are determined, which enables identifying geodynamically active fault zones in the geological borehole environment. The land works in the test borehole area aimed to confirm the borehole logging results. During the research, the anomalous magnetic fields were mapped, and the three-dimensional graphs of radon activity were plotted. The analysis results of the available geological information on the structure of the test area, data of land works and borehole surveys prove the known faults and reveal new geodynamically active faults within the limits of the studied geophysical fields.

Keywords: geoacoustic emission, electromagnetic radiation, logging, land magnetometry, hand-held gamma-radiation survey, faults, stress–strain behavior, complexing.
For citation:

Bazhenova E. A. Identification of fault zones within an orebody using a set of geophysical methods. MIAB. Mining Inf. Anal. Bull. 2022;(5):67-83. [In Russ]. DOI: 10.25018/ 0236_1493_2022_5_0_67.

Acknowledgements:
Issue number: 5
Year: 2022
Page number: 67-83
ISBN: 0236-1493
UDK: 550.832
DOI: 10.25018/0236_1493_2022_5_0_67
Article receipt date: 01.11.2021
Date of review receipt: 10.03.2022
Date of the editorial board′s decision on the article′s publishing: 10.04.2022
About authors:

E.A. Bazhenova, Researcher, e-mail: bazenova_jena@mail.ru, Institute of Geophysics of Ural Branch, Russian Academy of Sciences, 620016, Ekaterinburg, Russia, ORCID ID: 0000-0002-2068-7140.

 

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