New U–PB baddeleyite ages of mafic dyke swarms of the west African and amazonian cratons: Implication for their configuration in supercontinents through time

Research output: Chapter in Book/Report/Conference proceedingBook chapter

Abstract

Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West Africa and one in South America were dated using the high precision U–Pb TIMS method on baddeleyite. Some of the individual dykes reach over 300 km in length and they are considered parts of much larger systems of mafic dyke swarms representing the plumbing systems for large igneous provinces (LIPs). The new U–Pb ages obtained for the investigated swarms in the southern West African Craton (WAC) are the following (oldest to youngest): 1791 ± 3 Ma for the N010° Libiri swarm, 1764 ± 4 Ma for the N035° Kédougou swarm, 1575 ± 5 for the N100° Korsimoro swarm, ~1525–1529 Ma for the N130° Essakane swarm, 1521 ± 3 Ma for the N90° Sambarabougou swarm, 915 ± 7 Ma for the N070° Oda swarm, 867 ± 16 Ma for the N355° Manso swarm, 202 ± 5 Ma and 198 ± 16 Ma for the N040° Hounde swarm, and 200 ± 3 Ma for the sills in the Taoudeni basin. The last ones are related to the Central Atlantic Magmatic Province (CAMP) event. The Hounde swarm is oblique to the dominant radiating CAMP swarm and may be linked with the similar-trending elongate Kakoulima intrusion in Guinea. In addition, the N150° Käyser swarm (Amazonian craton, South America) is dated at 1528 ± 2 Ma, providing a robust match with the Essakane swarm in a standard Amazonia-West African craton reconstruction, and resulting in a combined linear swarm >1500 km by >1500 km in extent. The Precambrian LIP barcode ages of c. 1790, 1765–1750, 1575, 1520, 915. 870 Ma for the WAC are compared with the global LIP record to identify possible matches on other crustal blocks, with reconstruction implications. These results contribute to the refinement of the magmatic ‘barcode’ for the West African and Amazonian cratons, representing the first steps towards plausible global paleogeographic reconstructions involving the West African and Amazonian cratons.

Details

Authors
  • L. Baratoux
  • U. Söderlund
  • R. E. Ernst
  • E. de Roever
  • M. W. Jessell
  • S. Kamo
  • S. Naba
  • S. Perrouty
  • V. Metelka
  • D. Yatte
  • M. Grenholm
  • D. P. Diallo
  • P. M. Ndiaye
  • E. Dioh
  • C. Cournède
  • M. Benoit
  • D. Baratoux
  • N. Youbi
  • S. Rousse
  • A. Bendaoud
Organisations
External organisations
  • Université Paul Sabatier
  • Swedish Museum of Natural History
  • Carleton University
  • Tomsk State University
  • University of Western Australia, Crawley
  • University of Toronto
  • Laurentian University
  • University of California, Santa Cruz
  • Cadi Ayyad University
  • African Institute of Basic research
  • University of Ouagadougou
  • Cheikh Anta Diop University
  • CSIRO Mineral
  • University of Lisbon
  • University of Science and Technology Houari Boumediene
  • Vrije Universiteit Amsterdam
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geology
Original languageEnglish
Title of host publicationSpringer Geology
PublisherSpringer
Pages263-314
Number of pages52
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes

Publication series

NameSpringer Geology
ISSN (Print)2197-9545
ISSN (Electronic)2197-9553