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Mapping mafic dyke swarms, structural features, and hydrothermal alteration zones in Atar, Ahmeyim and Chami areas (Reguibat Shield, Northern Mauritania) using high-resolution aeromagnetic and gamma-ray spectrometry data

Ba, Moussa Hamath ; Jaffal, Mohammed ; Lo, Khalidou ; Youbi, Nasrrddine ; El Mokhtar Dahmada, Mohamed ; Ibouh, Hassan ; Boumehdi, Moulay Ahmed ; Aïfa, Tahar ; Amara, Massinissa and Jessell, Mark , et al. (2020) In Journal of African Earth Sciences 163.
Abstract

Analysis of an airborne geophysical data covering the Tasiast-Tijirit Terrane in the western part of the Reguibat Shield (including the 1:200,000 geological sheets of Chami, Ahmeyim and Atar), provided an improved mapping of mafic dyke swarms, structural features, and hydrothermal alteration zones. It also extended the mapping into extensive areas covered by sand. A low-altitude (100 m) airborne survey collected high-resolution magnetic and gamma-ray spectrometry data. The magnetic data were enhanced using techniques such as reduction to the pole, analytic signal and first vertical derivative, and revealed dyke swarms with trends of NNE-SSW to NE-SW, NW-SE to WNW-ESE and E-W. The use of the Euler deconvolution method provided... (More)

Analysis of an airborne geophysical data covering the Tasiast-Tijirit Terrane in the western part of the Reguibat Shield (including the 1:200,000 geological sheets of Chami, Ahmeyim and Atar), provided an improved mapping of mafic dyke swarms, structural features, and hydrothermal alteration zones. It also extended the mapping into extensive areas covered by sand. A low-altitude (100 m) airborne survey collected high-resolution magnetic and gamma-ray spectrometry data. The magnetic data were enhanced using techniques such as reduction to the pole, analytic signal and first vertical derivative, and revealed dyke swarms with trends of NNE-SSW to NE-SW, NW-SE to WNW-ESE and E-W. The use of the Euler deconvolution method provided constraints on the continuity and the depth of magnetic sources. Gamma-ray spectrometry which maps the three main radioactive elements, i.e. potassium, uranium and thorium helped discriminate lithological units of the Archean basement, notably felsic intrusions. The radiometric data also helped delineate potassic alteration zones, which could testify to hydrothermal activities of relevance to sulfide mineralisation.

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publication status
published
subject
keywords
Gamma-ray spectrometry, Mafic dyke, Magnetism, Mauritania, Reguibat shield, Terrane Tasiast-Tijirit
in
Journal of African Earth Sciences
volume
163
article number
103749
publisher
Elsevier
external identifiers
  • scopus:85078551101
ISSN
1464-343X
DOI
10.1016/j.jafrearsci.2019.103749
language
English
LU publication?
yes
id
9e00c56a-7413-4090-b8d7-920493a0077b
date added to LUP
2021-01-05 11:13:34
date last changed
2021-01-05 11:13:34
@article{9e00c56a-7413-4090-b8d7-920493a0077b,
  abstract     = {<p>Analysis of an airborne geophysical data covering the Tasiast-Tijirit Terrane in the western part of the Reguibat Shield (including the 1:200,000 geological sheets of Chami, Ahmeyim and Atar), provided an improved mapping of mafic dyke swarms, structural features, and hydrothermal alteration zones. It also extended the mapping into extensive areas covered by sand. A low-altitude (100 m) airborne survey collected high-resolution magnetic and gamma-ray spectrometry data. The magnetic data were enhanced using techniques such as reduction to the pole, analytic signal and first vertical derivative, and revealed dyke swarms with trends of NNE-SSW to NE-SW, NW-SE to WNW-ESE and E-W. The use of the Euler deconvolution method provided constraints on the continuity and the depth of magnetic sources. Gamma-ray spectrometry which maps the three main radioactive elements, i.e. potassium, uranium and thorium helped discriminate lithological units of the Archean basement, notably felsic intrusions. The radiometric data also helped delineate potassic alteration zones, which could testify to hydrothermal activities of relevance to sulfide mineralisation.</p>},
  author       = {Ba, Moussa Hamath and Jaffal, Mohammed and Lo, Khalidou and Youbi, Nasrrddine and El Mokhtar Dahmada, Mohamed and Ibouh, Hassan and Boumehdi, Moulay Ahmed and Aïfa, Tahar and Amara, Massinissa and Jessell, Mark and Ernst, Richard E. and Bensalah, Mohamed Khalil and Söderlund, Ulf},
  issn         = {1464-343X},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Journal of African Earth Sciences},
  title        = {Mapping mafic dyke swarms, structural features, and hydrothermal alteration zones in Atar, Ahmeyim and Chami areas (Reguibat Shield, Northern Mauritania) using high-resolution aeromagnetic and gamma-ray spectrometry data},
  url          = {http://dx.doi.org/10.1016/j.jafrearsci.2019.103749},
  doi          = {10.1016/j.jafrearsci.2019.103749},
  volume       = {163},
  year         = {2020},
}