Details of the abstract
| Title of paper | Drone based experimental TEM surveys over Lake Baikal and a uranium occurrence |
| List of authors | Author Hallbauer-Zadorozhnaya, Co-author Davydenko Yu.A., Co-author , Parshin A.V., Co-author Stettler E.H. |
| Affiliation(s) |
AeroPhysX (pty) Ltd, South Africa Irkutsk National Research Technical University, Russia Gelos Ltd, Russia University of Witwatersrand, South Africa, |
| Summary |
The results of experimental TEM surveys using drones, carried out at the Bolshoe Goloustnoye site on Lake Baikal and at a uranium deposit are presented. L Baikal is a unique geoelectrical situation, where low-resistivity lacustrine sediments are located under a relatively isotropic water body. The upper part of the sedimentary sequence is represented by diatomaceous silt with high conductivity, the lower part has denser clayey sediments. The task was to investigate the possibility of using a drone based TEM survey for delineating the electrical stratigraphy of the subsurface at depths between 50-200 m separated into layers and blocks. The geology of the uranium bearing area consists of a high-resistivity crystalline basement, overlain by low-resistivity sedimentary deposits (sands, clays) and effusive rocks and the TEM survey was undertaken to determine if the U mineralized strata have a distinctive resistivity signature. The combined instrumentation unit consisted of an EGI-500 generator providing bipolar current pulses, a Mars 4.0 which is a multi-channel electrical prospecting potential difference recorder, a PDI-50 receiver loop and a SibGIS UAS - unmanned 6-rotor aircraft with a payload of up to 10 kg. In both cases, a grounded electrical line AB was used as a source of the electromagnet field. Sixteen traverses of survey data were measured over the Baykal ice sheet and five traverses over the uranium deposit. For the interpretation of the TEM data the St technique was used, which allows tracing the change in the apparent longitudinal conductivity with depth. On the sections, a high-resistivity layer is clearly distinguished, corresponding to the water of Lake Baikal as well as sedimentary deposits, composed by several blocks of low resistivity. The U-bearing layers are confidently identified in all profiles at depths of 120-170 m. |
| Session Keyword | 3.0 Exploration, Monitoring and Hazards |
| File upload |
3.0_drone_based_experimental_hallbauer-zadorohnaya.pdf
|