Geophysical research: article

K.A. Ermolaev 1 V.V. Olenchenko 1,2
1 Novosibirsk State University 2 Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences
Journal: Geophysical research
Tome: 24
Number: 1
Year: 2023
Pages: 61-73
UDK: 550.837.31+550.837.81+539.26
DOI: 10.21455/gr2023.1-4
Full text
Keywords: electrical resistivity tomography, induced polarization, hearths, archaeological geophysics.
Аnnotation: The paper discusses anomalies that occur in electrical fields above the deposits of hearths. Hearths are an im-portant object of search during archaeological work and are traditionally distinguished by the positive anomaly of magnetic field induction. However, magnetic measurements are not available on every site, in addition, pos-itive magnetic anomalies are caused not only from hearth’s deposits. In the 60s of the last century, it was es-tablished that the hearths can be detected using the induced polarization method (IP), but the technique was not developed due to the imperfection of the equipment of those years. Currently, the use of multi-electrode multichannel electrical exploration stations makes it possible to quickly obtain information about the distribution of electrical properties and restore the three-dimensional geoelectric structures. In the presented study, geoelectric anomalies from the hearths were studied, their nature was clarified, and the possibility of using the electrical resistivity tomography (ERT) method to search for such objects was evaluated. As a result, by the example of fieldwork and experimental measurements, it is shown that the hearths create an intense anomaly of induced polarization and is distinguished by a very low electrical resistiv-ity. In addition, the boundaries of the hearth are well distinguished on the maps of the normalized chargeability distribution. To study the nature of geoelectrical anomalies, X-ray phase analysis and measurements of in-duced polarization, electrical resistivity, and magnetic susceptibility were carried out on rock samples from the hearths. An analysis of the results showed that the cause of the anomaly of low electrical resistivity, as well as the anomaly of polarizability, is the content of X-ray amorphous carbon in the deposits of the fire in the form of soot, but not magnetite. It is recommended to use the method of electrical resistivity tomography with the measurement of induced polarization to search for hearths during archaeological research.
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