On the Origin and Interpretation of Self‐potential Anomalies*

Kilty, K. T.

doi:10.1111/j.1365-2478.1984.tb00716.x

Cited by 26 publications

(14 citation statements)

References 12 publications

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“…Many researchers (Sato and Mooney 1960;Kilty 1984) postulated different theories to explain the origin of the different types of SP. This method is passive, non-intrusive, and does not require the application of an electrical current.…”

Section: Self Potential Methodsmentioning

confidence: 99%

Integrated approach for demarcating subsurface pollution and saline water intrusion zones in SIPCOT area: a case study from Cuddalore in Southern India

Sankaran

Sonkamble

Krishnakumar

et al. 2011

Environ Monit Assess

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This paper deals with a systematic hydrogeological, geophysical, and hydrochemical investigations carried out in SIPCOT area in Southern India to demarcate groundwater pollution and saline intrusion through Uppanar River, which flows parallel to sea coast with high salinity (average TDS 28, 870 mg/l) due to back waters as well as discharge of industrial and domestic effluents. Hydrogeological and geophysical investigations comprising topographic survey, self-potential, multi-electrode resistivity imaging, and water quality monitoring were found the extent of saline water intrusion in the south and pockets of subsurface pollution in the north of the study area. Since the area is beset with highly permeable unconfined quaternary alluvium forming potential aquifer at shallow depth, long-term excessive pumping and influence of the River have led to lowering of the water table and degradation of water quality through increased salinity there by generating reversal of hydraulic gradient in the south. The improper management of industrial wastes and left over chemicals by closed industries has led surface and subsurface pollution in the north of the study area.

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Section: Self Potential Methodsmentioning

confidence: 99%

Integrated approach for demarcating subsurface pollution and saline water intrusion zones in SIPCOT area: a case study from Cuddalore in Southern India

Sankaran

Sonkamble

Krishnakumar

et al. 2011

Environ Monit Assess

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“…Oxidation and hydrolysis are continuing processes at the base of the regolith and iron oxides are being mobilised by biogenic decay products at the surface but there is no geophysical evidence for the existence of such electrochemical cells as shown in massive sulfide deposits (Thornber 1982;Corry et al 1983;Kilty 1984). Furthermore, the adjacent non-BIF rocks are also oxidised and there is no evidence of additional deposition of iron either in BIF or in deep saprolite ore deposits.…”

Section: Supergene Genesis Models (Bif To Ore)mentioning

confidence: 91%

Banded iron formation to high-grade iron ore: a critical review of supergene enrichment models

Lascelles

2012

Australian Journal of Earth Sciences

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All the major worldwide direct-shipping iron ore deposits associated with banded iron formations (BIF) are characteristically deeply weathered. They extend to considerable depths below the water table and show well-preserved primary structures and textures, but characteristically most deposits contain no evidence of chert bands being present prior to weathering. Recent studies have found evidence of hydrothermal and/ or metamorphic influences in the development of certain ore deposits and new genesis models such as the supergene-modified hypogene model have been postulated for major high-grade iron ore deposits. Nevertheless, there are many high-grade deposits that show no evidence of hypogene alteration and for which a hypogene or metamorphic genesis is unreasonable that are automatically ascribed to supergene enrichment, commonly erroneously attributed to lateritic weathering in tropical environments. Laterite (sensu lato) is a soil formation in which primary textures are destroyed and is underlain by a pallid zone showing the preservation of chert and the depletion, not enrichment, of iron oxides and thus is totally incompatible with the formation of the high-grade ore deposits. Various theories and models that purported to explain the conditions under which such a uniquely BIF-related dissolution of quartz and residual accumulation of hematite could occur by supergene processes typically conflict with current understanding of groundwater hydrology, chemistry, weathering processes and soil formation.Supergene enrichment of ore is universal in the leaching of gangue minerals such as iron silicates, carbonates and apatite and supergene enrichment of BIF to low-grade ore is common in near surface environments above the water table such as ferrugenised BIF outcrops, detrital ore deposits, and some shallow ore deposits that have been subjected to prolonged exposure to fresh meteoric water. In all cases of supergene enrichment traces of the chert bands are visible and the dissolution or replacement processes for the removal of quartz are clear, in direct contrast to the most important deep saprolite ore deposits that show no trace of chert bands.The widespread acceptance of an inappropriate and untenable supergene enrichment model inhibits search for the true origin of the ore and our ability to predict and find concealed high-grade ore deposits.

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“…In Table 1, the values of the calculated parameters are compared with those obtained by Kilty, 1984 and with geological data obtained from drill holes (Zachos, 1963). Generally, the parameter values which were calculated according to the proposed method are in good agreement with those calculated by Kilty's trial and error quantitative interpretation, as well as with the geological data concerning the upper part of the ore body.…”

Section: Application Of the Methods On Real Field Datamentioning

confidence: 99%

“…These curves can be useful only if a priori knowledge about the depth and dimensions of the dipole is available, therefore they are not of practical importance. Kilty (1984) proposes a trial and error method in order to find the model that fits satisfactorily the SP anomaly. According to our experience (Skianis et al, 2000), trial and error methods may converge to parameter values which provide a good fit but can be quite far from reality.…”

Section: Introductionmentioning

confidence: 99%