Geophysical investigation of earth dam using the electrical tomography resistivity technique

Camarero, Pedro Lemos; Moreira, César Augusto

doi:10.1590/0370-44672016700099

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…This process was developed on the Oasis Montaj platform, where the 2D data obtained in the Res-2Dinv program were interpolated to generate 2D visualization models by means of the method of minimum curvature, in addition to the adjustment of surface of isovalues. This procedure is described in several studies of combined use of Geoelectric methods (Moreira and Ilha, 2011;Helene et al, 2016;Camarero and Moreira 2017;Casagrande et al, 2018, Cavallari et al, 2018.…”

Section: Resultsmentioning

confidence: 99%

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

et al. 2021

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The geophysical diagnosis of mineral deposits can be extremely useful in detailing mineralized zones and is a strategy for direct sampling by probing holes for content analysis. This study involves the combined use of Electrical geophysical methods (DC resistivity and Induced Polarization), geological recognition and structural field analysis, with a study of the mineralized occurrence of copper, previously described in a systematic geochemical survey carried out by the Geological Survey of Brazil (CPRM), located in the north of the Camaquã Basin, extreme south of Brazil. The mineral occurrence is partially outcropped and consists of quartz vein shafts with malachite and relic structures of sulfides, contained in schist. Structural data obtained in the field revealed the existence of a system of fracture pairs in the directions N40-50W and N70-80E. Such information is presented in the programming of the geophysical data acquisition scheme, which consisted of 6 lines of electrical tomography with 410m each, in azimuthal disposition and Schlumberger arrangement, where all lines cross a single center and are separated according to an angle of 30°, in an attempt to cover fractures in various orientations. The 2D results reveal the existence of high chargeability zones (>40mV/V) positioned below the 40m depth. These data were interpolated in 3D visualization models and generated resistivity and chargeability maps for several depths, which integrated with previous structural data, and indicate the existence of zones with potential sulfide concentration with strong structural control, in addition to clear target recognition for direct and objective probing evaluation, with rationalization of costs.

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Section: Resultsmentioning

confidence: 99%

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

et al. 2021

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“…Negative SP values appear in the region of the downstream slope and develop upstream, as shown in the scheme of Figure 7. It is not the focus of this research, but electrical resistivity surveys in this same dam showed high values of electrical conductivity at this point, identifying a possible water saturation zone (Camarero, 2017).…”

Section: Cordeirópolis Dammentioning

confidence: 89%

Detection of seepage paths in small earth dams using the self-potential method (SP)

2020

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The application of geoelectric methods, such as induced polarization (IP), the electrical resistivity and the self-potential (SP), presents an important indirect study methodology in several areas of geology, such as mining, geotechnics and environmental geology. The present study deals with the results of the application of the selfpotential method (SP) in small earth dams in the cities of Cordeirópolis and Ipeúna, both in the state of São Paulo. Studies of the Engineering of Dams intensified at the end of century XX, due to alarming number of dam disruptions. In Brazil, small dams are still the majority, around 90% of the total. This article presents results of surveys of the self-potential in two small dams, analyzing the flow of fluids, heat or ions inside the dams, as well as possible areas of percolation or water saturation. Three lines of 78 meters each were made with a spacing of 2 meters between the electrodes in the Cordeirópolis dam, and three lines of 122 meters each, spaced 2 meters between the electrodes in the Ipeúna dam. In both collections, the potential technique (or fixed base) was used. The collected data was worked on 2D maps of self-potential, which allowed to identify the zones with greater and smaller values of potential difference, preferential flow of the subsurface fluids in the areas, and possible problems in the structure of the dam (seepage paths), which could affect the physical integrity of the structure.

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“…The 2D inversion models were exported from Res2dinv and imported into Oasis Montaj software developed by Geosoft aiming to create a 3D visualization model with adjustment of topographic data. These 3D visualization models facilitate the understanding of complex geological structures associated to the modeling of mineral deposits and to hydrological problems, such as flow of contaminants (Zanchi et al, 2009;Aizebeokhai et al, 2011;Moreira et al, 2012, Camarero and Moreira, 2017.…”

Section: Methodsmentioning

confidence: 99%

Geophysical prospection in tin mineral occurrence associated to greisen in granite São Sepé (RS)

et al. 2018

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The discovery of new mineral resources involves various research techniques through direct and indirect studies. The geophysical methods are important tools in the detection of deep deposits because they use the contrast between the physical properties of the hosting rocks and the mineralized zone. In this sense, electrical geophysical methods are widely used in the prospecting of sulfide deposits. This work presents and discusses the results of the application of the Induced Polarization geophysical method in the investigation of a tin mineral occurrence associated with greisen, located on the western border of São Sepé Granite. The study area is located in the central portion of the Rio Grande do Sul State, in the municipality of São Sepé (RS), housed in the metavolcano-sedimentary rocks of the Vacacaí Metamorphic Complex. Six lines of electrical tomography were parallel arranged in the N30W direction. The 2D inversion models allowed to identify areas of high chargeability (above 5.0 mV/V), possibly attributed to areas with sulfide accumulation. The areas with low values (below 1.9 mV/V) area associated with soil and rocks absent of mineralization. Through the 3D visualization models, it was possible to identify that the mineralized zone apparently has continuity for more than 36 m. These models also allowed identifying the morphology and the lateral continuity of the sulfide zone. Thus, the results of this work demonstrate the possibility of using Induced Polarization in the research of cassiterite deposits with associated sulfides due to the contrast of physical properties obtained from the high polarizability of the sulfides.

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Geophysical investigation of earth dam using the electrical tomography resistivity technique

Cited by 16 publications

References 14 publications

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

Detection of seepage paths in small earth dams using the self-potential method (SP)

Geophysical prospection in tin mineral occurrence associated to greisen in granite São Sepé (RS)

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