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Spatial and temporal distribution patterns of Precambrian mafic dyke swarms in northern Mauritania (West African craton) : analysis and results from remote-sensing interpretation, geographical information systems (GIS), Google Earth ™ images, and regional geology

Ba, Moussa Hamath ; Ibouh, Hassan ; Lo, Khalidou ; Youbi, Nassrddine ; Jaffal, Mohammed ; Ernst, Richard E. ; Niang, Abdoul Jelil ; Dia, Ibrahima ; Abdeina, El Houssein and Bensalah, Mohamed Khalil , et al. (2020) In Arabian Journal of Geosciences 13(5).
Abstract

We used remote sensing, geographical information systems, Google Earth™ images, and regional geology in order to (i) improve the mapping of linear structures and understand the chronology of different mafic dyke swarms in the Ahmeyim area that belongs to the Archean Tasiast-Tijirit Terrane of the Reguibat Shield, West African craton, NW Mauritania. The spatial and temporal distributions with the trends of the dyke swarms provide important information about geodynamics. The analysis of the mafic dyke swarms map and statistical data allow us to distinguish four mafic dyke swarm sets: a major swarm trending NE-SW to NNE-SSW (80%) and three minor swarms trending EW to ENE-WSW (9.33%), NW-SE to WNW-ESE (9.06%), and NS (1.3%). The major... (More)

We used remote sensing, geographical information systems, Google Earth™ images, and regional geology in order to (i) improve the mapping of linear structures and understand the chronology of different mafic dyke swarms in the Ahmeyim area that belongs to the Archean Tasiast-Tijirit Terrane of the Reguibat Shield, West African craton, NW Mauritania. The spatial and temporal distributions with the trends of the dyke swarms provide important information about geodynamics. The analysis of the mafic dyke swarms map and statistical data allow us to distinguish four mafic dyke swarm sets: a major swarm trending NE-SW to NNE-SSW (80%) and three minor swarms trending EW to ENE-WSW (9.33%), NW-SE to WNW-ESE (9.06%), and NS (1.3%). The major swarms extend over 35 km while the minor swarms do not exceed 13 km. The Google Earth™ images reveal relative ages through crossover relationships. The major NE-SW to NNE-SSW and the minor NS swarms are the oldest generations emplaced in the Ahemyim area. The NW-SE-oriented swarm dykes which are cutting the two former swarms are emplaced later. The minor E-W to WSW-ENE swarms are probably the youngest. A precise U-Pb baddeleyite age of 2733 ± 2 Ma has been obtained for the NNE-SSW Ahmeyim Great Dyke. This dyke is approximately 1500 m wide in some zone and extends for more than 150 km. The distinct mafic dyke swarms being identified in this study can potentially be linked with coeval magmatic events on other cratons around the globe to identify reconstructed LIPs and constrain continental reconstructions.

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type
Contribution to journal
publication status
published
subject
keywords
Ahmeyim, Landsat 8 Oli, Lineaments, Mafic dyke, Mauritania, Precambrian
in
Arabian Journal of Geosciences
volume
13
issue
5
article number
209
publisher
Springer
external identifiers
  • scopus:85079730094
ISSN
1866-7511
DOI
10.1007/s12517-020-5194-2
language
English
LU publication?
yes
id
e7967611-0625-43a4-8028-ce2d29006c0c
date added to LUP
2020-03-03 14:49:03
date last changed
2020-03-11 08:21:48
@article{e7967611-0625-43a4-8028-ce2d29006c0c,
  abstract     = {<p>We used remote sensing, geographical information systems, Google Earth™ images, and regional geology in order to (i) improve the mapping of linear structures and understand the chronology of different mafic dyke swarms in the Ahmeyim area that belongs to the Archean Tasiast-Tijirit Terrane of the Reguibat Shield, West African craton, NW Mauritania. The spatial and temporal distributions with the trends of the dyke swarms provide important information about geodynamics. The analysis of the mafic dyke swarms map and statistical data allow us to distinguish four mafic dyke swarm sets: a major swarm trending NE-SW to NNE-SSW (80%) and three minor swarms trending EW to ENE-WSW (9.33%), NW-SE to WNW-ESE (9.06%), and NS (1.3%). The major swarms extend over 35 km while the minor swarms do not exceed 13 km. The Google Earth™ images reveal relative ages through crossover relationships. The major NE-SW to NNE-SSW and the minor NS swarms are the oldest generations emplaced in the Ahemyim area. The NW-SE-oriented swarm dykes which are cutting the two former swarms are emplaced later. The minor E-W to WSW-ENE swarms are probably the youngest. A precise U-Pb baddeleyite age of 2733 ± 2 Ma has been obtained for the NNE-SSW Ahmeyim Great Dyke. This dyke is approximately 1500 m wide in some zone and extends for more than 150 km. The distinct mafic dyke swarms being identified in this study can potentially be linked with coeval magmatic events on other cratons around the globe to identify reconstructed LIPs and constrain continental reconstructions.</p>},
  author       = {Ba, Moussa Hamath and Ibouh, Hassan and Lo, Khalidou and Youbi, Nassrddine and Jaffal, Mohammed and Ernst, Richard E. and Niang, Abdoul Jelil and Dia, Ibrahima and Abdeina, El Houssein and Bensalah, Mohamed Khalil and Boumehdi, Moulay Ahmed and Söderlund, Ulf},
  issn         = {1866-7511},
  language     = {eng},
  number       = {5},
  publisher    = {Springer},
  series       = {Arabian Journal of Geosciences},
  title        = {Spatial and temporal distribution patterns of Precambrian mafic dyke swarms in northern Mauritania (West African craton) : analysis and results from remote-sensing interpretation, geographical information systems (GIS), Google Earth ™ images, and regional geology},
  url          = {http://dx.doi.org/10.1007/s12517-020-5194-2},
  doi          = {10.1007/s12517-020-5194-2},
  volume       = {13},
  year         = {2020},
}