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

Longo, Vittorio and Testone, Valeria and Oggiano, Giacomo and Testa, A. (2014) Prospecting for clay minerals within volcanic successions: application of electrical resistivity tomography to characterise bentonite deposits in northern Sardinia (Italy). Journal of applied geophysics, Vol. 111 , p. 21-32. ISSN 0926-9851. eISSN 1879-1859. Article.

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DOI: 10.1016/j.jappgeo.2014.09.014

Abstract

Electrical resistivity tomography (ERT) is applied to prospect for and characterise a bentonitic clay deposit in northern Sardinia. Sardinian bentonites derived from the hydrothermal alteration of thick successions of pyroclastic flows and epiclastites are associated with the Oligo-Miocene calc-alkaline volcanic cycle. The alteration of these rocks is generally controlled by faults that control the local circulation of hydrothermal fluids. Two-dimensional ERT investigations were performed close to a faulted area to define the location, thickness and lateral continuity of the clayey body, and determine how it relates to faulting and stratigraphy. A linebased three-dimensional ERT data acquisition was carried out in a selected area to estimate the available clay reserves. The reliability of these resistivity models was assessed by comparison with local borehole data. Finally, the interpretation of the ERT results was optimised through synthetic modelling of the electrical resistivity imaging technique. The results define the extent and geometry of the bentonitic deposit with good accuracy and outline the scenarios where the ERTmethodmay provide optimal resultswhen prospecting for clay deposits.

Item Type:Article
ID Code:10646
Status:Published
Refereed:Yes
Uncontrolled Keywords:Electrical resistivity tomography (ERT), bentonite, mineral exploration, synthetic modelling, Sardinia
Subjects:Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Elsevier
ISSN:0926-9851
eISSN:1879-1859
Deposited On:19 Jan 2015 16:49

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