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Mapping geological structures in bedrock via large-scale direct current resistivity and time-domain induced polarization tomography

Rossi, Matteo LU ; Olsson, Per Ivar LU ; Johanson, Sara LU ; Fiandaca, Gianluca; Bergdahl, Daniel Preis and Dahlin, Torleif LU (2017) In Near Surface Geophysics 15(6). p.657-667
Abstract

An investigation of geological conditions is always a key point for planning infrastructure constructions. Bedrock surface and rock quality must be estimated carefully in the designing process of infrastructures. A large direct-current resistivity and time-domain induced-polarization survey has been performed in Dalby, Lund Municipality, southern Sweden, with the aim of mapping lithological variations in bedrock. The geology at the site is characterised by Precambrian granitic gneisses and amphibolites, which are intensely deformed, fractured, and partly weathered. In addition, there are northwest-trending Permian dolerite dykes that are less deformed. Four 2D direct-current resistivity and time-domain induced-polarization profiles of... (More)

An investigation of geological conditions is always a key point for planning infrastructure constructions. Bedrock surface and rock quality must be estimated carefully in the designing process of infrastructures. A large direct-current resistivity and time-domain induced-polarization survey has been performed in Dalby, Lund Municipality, southern Sweden, with the aim of mapping lithological variations in bedrock. The geology at the site is characterised by Precambrian granitic gneisses and amphibolites, which are intensely deformed, fractured, and partly weathered. In addition, there are northwest-trending Permian dolerite dykes that are less deformed. Four 2D direct-current resistivity and time-domain induced-polarization profiles of about 1-km length have been carefully pre-processed to retrieve time-domain induced polarization responses and inverted to obtain the direct-current resistivity distribution of the subsoil and the phase of the complex conductivity using a constant-phase angle model. The joint interpretation of electrical resistivity and induced-polarization models leads to a better understanding of complex three-dimensional subsoil geometries. The results have been validated by lithological descriptions from several drillings. In addition, direct-current resistivity and time-domain induced-polarization logging has been carried out in two different boreholes, showing a good match with the results of the surface direct-current resistivity and time-domain induced-polarization profiles. The direct-current resistivity and time-domain induced-polarization methodology proved to be a suitable technique for extensively mapping weathered zones with poor geotechnical characteristics and tectonic structures, which can lead to severe problems for infrastructure construction and/or constitute risk zones for aquifer contamination.

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author
organization
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type
Contribution to journal
publication status
published
subject
in
Near Surface Geophysics
volume
15
issue
6
pages
11 pages
publisher
EAGE
external identifiers
  • scopus:85039068001
ISSN
1569-4445
DOI
10.3997/1873-0604.2017058
language
English
LU publication?
yes
id
030cd99d-5252-41df-bdf3-45f6d6547563
date added to LUP
2018-01-05 10:54:26
date last changed
2018-01-08 14:56:35
@article{030cd99d-5252-41df-bdf3-45f6d6547563,
  abstract     = {<p>An investigation of geological conditions is always a key point for planning infrastructure constructions. Bedrock surface and rock quality must be estimated carefully in the designing process of infrastructures. A large direct-current resistivity and time-domain induced-polarization survey has been performed in Dalby, Lund Municipality, southern Sweden, with the aim of mapping lithological variations in bedrock. The geology at the site is characterised by Precambrian granitic gneisses and amphibolites, which are intensely deformed, fractured, and partly weathered. In addition, there are northwest-trending Permian dolerite dykes that are less deformed. Four 2D direct-current resistivity and time-domain induced-polarization profiles of about 1-km length have been carefully pre-processed to retrieve time-domain induced polarization responses and inverted to obtain the direct-current resistivity distribution of the subsoil and the phase of the complex conductivity using a constant-phase angle model. The joint interpretation of electrical resistivity and induced-polarization models leads to a better understanding of complex three-dimensional subsoil geometries. The results have been validated by lithological descriptions from several drillings. In addition, direct-current resistivity and time-domain induced-polarization logging has been carried out in two different boreholes, showing a good match with the results of the surface direct-current resistivity and time-domain induced-polarization profiles. The direct-current resistivity and time-domain induced-polarization methodology proved to be a suitable technique for extensively mapping weathered zones with poor geotechnical characteristics and tectonic structures, which can lead to severe problems for infrastructure construction and/or constitute risk zones for aquifer contamination.</p>},
  author       = {Rossi, Matteo and Olsson, Per Ivar and Johanson, Sara and Fiandaca, Gianluca and Bergdahl, Daniel Preis and Dahlin, Torleif},
  issn         = {1569-4445},
  language     = {eng},
  month        = {12},
  number       = {6},
  pages        = {657--667},
  publisher    = {EAGE},
  series       = {Near Surface Geophysics},
  title        = {Mapping geological structures in bedrock via large-scale direct current resistivity and time-domain induced polarization tomography},
  url          = {http://dx.doi.org/10.3997/1873-0604.2017058},
  volume       = {15},
  year         = {2017},
}