Prospecting for clay minerals within volcanic successions: Application of electrical resistivity tomography to characterise bentonite deposits in northern Sardinia (Italy)

Longo, Vittorio; Testone, Valeria; Oggiano, Giacomo; Testa, A.

doi:10.1016/j.jappgeo.2014.09.014

Cited by 12 publications

(4 citation statements)

References 23 publications

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“…The 2D ERT survey arrangement in the area of investigation comprised of six resistivity lines (R1, R2, R3, R4, R5, R6) at various locations having lengths of 400 m each, schematized in Figure 3. The subsurface apparent resistivity data was acquired by exploiting multichannel ABEM LS Terameter, connected to two multi cable system with 31 output each, allowing a total number of 62 stainless steel electrodes arrangement linearly (Lesparre et al, 2016;Longo et al, 2014;Persson et al, 2011). Prior to the resistivity data collection, the total number of electrodes (61 electrodes, one electrode as the center electrode) and spacing (5 m) between them was set, which remained constant throughout the survey.…”

Section: Methodology 2d Electrical Resistivity Imaging Data Acquisitionmentioning

confidence: 99%

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Recognition of boulder in granite deposit using integrated borehole and 2D electrical resistivity imaging for effective mine planning and development

Junaid¹,

Abdullah²,

Sa'Ari³

et al. 2019

BGSM

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Evaluations of a mineral resource are necessary for mineral rights, owners and investors alike. However, for resource evaluation the detail documentation of subsurface geological spatial distribution such as lateral and vertical extent of bedrock and topsoil, hydrogeological investigation and boulder characterisation is mandatory. Boulder is hard and crystalline compact rock block, which substantial presence in a deposit highly influence the drilling equipment selection. A traditional exploration technique particularly for granite resource evaluation is drilling. But even finite number of drilling sample fails in the accurate delineation of boulders because drilling is limited to small point and rock mass is heterogenous and thus immense portion of the deposit via drilling method remain discern. 2D electrical resistivity imaging (2D ERT) technique of the study area over an area of 3.5 km 2 was accomplished by six resistivity lines using a Schlumberger protocol with inner and outer electrode spacing of 5 m and 10 m respectively. Inverted resistivity images successfully identify the existence of boulders in the area of investigation in the topsoil region; characterized by high resistivity values more than 2400 Ω.m. Whereas, only one core log (BH3) out of three reported presence of boulders. Thus, the research study presented in this paper enables us to conclude that the combined application of borehole and ERT allows us to derive that 2D ERT enhances the resource evaluation efficiency and reduces the cost considerably for underlying subsurface geological characterization.

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Section: Methodology 2d Electrical Resistivity Imaging Data Acquisitionmentioning

confidence: 99%

“…Beresnev et al, 2002;Bharti et al, 2016;Chambers J. et al, 2013;Chambers J.E. et al, 2006;Dahlin & Zhou, 2004;Longo et al, 2014;Meju, 2002;Mojica et al, 2017;Rucker et al, 2012;Van Schoor, 2002).…”

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confidence: 99%

Recognition of boulder in granite deposit using integrated borehole and 2D electrical resistivity imaging for effective mine planning and development

Junaid¹,

Abdullah²,

Sa'Ari³

et al. 2019

BGSM

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“…The purpose of this research to find the electrical characteristics of volcanic deposits saturated leachate as Piyungan landfill overlying such kind of lithology.Research conducted by Longo (2014) obtained ER value of volcanic deposits are between 4-20 Ohm-m (Longo et al, 2014). On this research, samples were obtained from the volcanic deposits around Piyungan landfill.…”

Section: Introductionmentioning

confidence: 97%

The Effect of Differences Leachate Concentration and Material Properties on Electrical Conductivity of Volcanic Deposits – Case Studies Piyungan Landfill Bantul Yogyakarta

et al. 2016

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Monitoring at the contaminated subsurface soil, have been conducted by using the geophysical surface method, especially for geoelectrical resistivity method. Monitoring is commonly conducted by using geoelectrical resistivity through measuring the value of Electrical Resistivity (ER) or Electrical Conductivity (EC) of leachate contaminated soil layer. EC measurement value of soil is affected by many factors, among others, particle conduction of soil materials, surface conduction, fluid conduction in the pores as well as the effect of particle shape and soil materials. Piyungan landfill is the main disposal site of Yogyakarta municipal solid waste. This landfill located mainly on the tertiary rocks of volcanic rocks and its weathering products. In order to improve the accuracy of geoelectrical measurements on resistivity in monitoring soil layers from contaminated leachate on this area, this research conducted several measurements on physical properties of soil sample and electrical properties of leachate in the saturated soil samples. The measurement of physical properties includes: porosity, clay content, particle content, and cation exchange capacity (CEC) value. The soil samples were collected from 3 locations around Piyungan Landfill. Type of soils are taken from the alluvial deposits (Sample B), weathered tuffaceous sandstone-claystone (Sample D), and weathered andesitic breccia (Sample F). Samples were made in containers, saturated with aquades-leachate solution with 12 different concentration levels. Electrical conductivity (EC) was measured by using Soil Box Miller and Geoelectric Resistivity Oyo McOhm. According to results of physical properties analysis, the grain size of soils are dominantly sandy clayey silt in grain size distribution, with clay content ranging from 33.0--38.4 %, the CEC values ranging from 26.8--52.7 meq/100 gr, and the porosity of samples B, D and F is 58.85 %, 55.30 %, 59.24 %, respectively. Based on the experiments with 12 different leachate concentrations, there is a linear increase in EC of 0.718mS/cm for every increase in electrical conductivity pore fluid (ECf ) 1 mg/l in samples B, while in samples D and F are 0.492 mS/cm and 0.284 mS/cm respectively. Plotting the data of EC vs ECf for each samples and ER vs ECf , it can be concluded the slope ofDEC/DECf differ for each samples and the electrical conductivity value of different concentration of leachate is very sensitive for alluvial deposits compare to the weathered tuffaceous sandstone-claystone and weathered volcanic breccia deposits.

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“…Electrical resistivity surveys have long been employed in the investigations of shallow subsurface, including hydrogeological, geotechnical and environmental studies. It is most common to carry out vertical electrical sounding (VES), but resistivity profiling (electrical resistivity tomography (ERT)) is also applied in fields, including aquifer characterization and tracer test (Turesson 2006, Wilkinson et al 2010, Arora and Ahmed 2011, Doetsch et al 2011, McClymont et al 2011, studying unsaturated zone (Andrews et al 1995, Carrière et al 2013, studying resources (Chambers et al 2013, Longo et al 2014, characterizing water leakage in dam (Al-Fares 2011), investigating complex subsurface geology (Griffiths and Barker 1993), among many others. VES surveys are conducted in, e.g., the area of the abandoned landfill (Khalil 2012), hydraulic parameters estimation (Perdomo et al 2014), delineating saltwater and freshwater aquifers (Hodlur et al 2006), investigating hydrogeology (Lenkey et al 2005), characterizing water leakage in dam (Al-Fares 2011), studying saline water intrusion in coastal alluvial terrain (Choudhury et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Possibility of Inferring Water Quality using DC Electrical Resistivity Measurements : A Case Study of the Dupi Tila Aquifer in Bangladesh

Hossain

2016

J Bangladesh Acad Sci

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A method of determining some parameters of water quality, namely calcium and hardness concentrations in the Dupi Tila sand aquifer in Bangladesh using vertical electrical sounding (VES) measurements is presented. The study site comprises an elevated land of the Madhupur Tract representing the Madhupur Clay Formation of the Pleistocene age. Using the relationships between formation water resistivity (Rw) and calcium and hardness concentrations have allowed to relate the latter to formation resistivity (Ro) as functions of porosity (?). The VES derived water quality parameter values seem to differ to some extent from that obtained from laboratory analysis. Provided VES data interpretation is well constrained, it can be a tool that might give some hints of the quality of water. The assumptions to be made to infer water quality from geoelectric sections are presented.Journal of Bangladesh Academy of Sciences, Vol. 40, No. 1, 1-10, 2016

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Prospecting for clay minerals within volcanic successions: Application of electrical resistivity tomography to characterise bentonite deposits in northern Sardinia (Italy)

Cited by 12 publications

References 23 publications

Recognition of boulder in granite deposit using integrated borehole and 2D electrical resistivity imaging for effective mine planning and development

Recognition of boulder in granite deposit using integrated borehole and 2D electrical resistivity imaging for effective mine planning and development

The Effect of Differences Leachate Concentration and Material Properties on Electrical Conductivity of Volcanic Deposits – Case Studies Piyungan Landfill Bantul Yogyakarta

Possibility of Inferring Water Quality using DC Electrical Resistivity Measurements : A Case Study of the Dupi Tila Aquifer in Bangladesh

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