Possible primary sources of diamond in the North African diamondiferous province

M. Kahoui*, Y. Mahdjoub, F. V. Kaminsky

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

12 Citations (Scopus)

Abstract

The Eglab shield is the easternmost part of the Reguibat rise, which belongs to the West African craton (WAC). It corresponds to the amalgamation of the Yetti and Eglab Palaeoproterozoic domains. These domains are separated by a mega-shear zone called the 'Yetti-Eglab Junction' where fieldwork has led to the discovery of kimberlite indicator minerals but no diamond. In the southwestern part of this zone, an outcrop of Archaean basement and a komaditic-picritic dyke had been recognized. Within the Eglab shield, deep-seated lithospheric faults control emplacement of alkaline complexes, and of small circular structures made up of mafic, ultramafic and silica-undersaturated rocks. These structural zones are characterized by widespread development of dyke swarms and repeated reactivations of earlier Eburnean trends from the Neoproterozoic to Mesozoic. Accordingly, they are sites of high magmatic permeability and crustal weakness. In this study, we summarize all known earlier and newly obtained structural, geophysical, geological and geochemical data on this area. They indicate that the 'Yetti-Eglab Junction' has good possibilities for the finding of kimberlite or/and other diamondiferous rocks. The features of the Eglab shield provide a possible explanation for the enigmatic sources of the diamond-bearing Reggane placer deposit located at the boundary of the WAC.

Original languageEnglish
Title of host publicationThe Boundaries of the West African Craton
EditorsNasser Ennih, Jean-Paul Liégeois
Place of PublicationLondon
PublisherGeological Society of London
Pages77-109
Number of pages33
Volume297
ISBN (Print)9781862392519
DOIs
Publication statusPublished - 2008
Externally publishedYes

Publication series

NameGeological Society Special Publication
Volume297
ISSN (Print)03058719

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