Geology

The geology of Chad is characterised by Precambrian metamorphics and sediments surrounding the central Chad Basin. Precambrian rocks occur in the Tibesti Mountains in the north and the east. There is a large area of basement rocks exposed in eastern Chad which extends across the border into the Darfur region of Sudan. The dominant lithologies are granitic gneiss and pelitic-graphitic schists both cut by numerous late orogenic granites and pegmatites. Lower Paleozoic sandstone sequences in the Kufra Basin in the northeast are overlain by Nubian Sandstones. The Lower Cretaceous is made up of continental clastic rocks whilst rocks of the Upper Cretaceous are marine.

Tertiary sediments cover part of southern Chad and the Neogene Chad Formation comprises lacustrine sediments within the Chad Basin. Currently Chad has no significant mineral industry; mineral commodities including artisanal gold, salt and soda ash production have made a negligible contribution to the economy while Nb-Ta,and Sn-W mineralisation is reported but as yet not mined. International companies were involved in exploration and production of crude oil and exploration for uranium continues

Geological:

  • 1:500 000, BRGM, 1962- 2 sheets, all published;
  • BRGM, 1/50 000 (5 maps, 1973-82);
  • BRGM, 1/100 000 (2 maps); 
  • BRGM, 1/500 000 (6 maps);
  • BRGM, 1/1 000 000 (3 maps);
  • BRGM, 1/1 500 000 (1 maps);  and
  • Carte géologique du Tchad (1978), 1/2 000 000 (1 map)

Geophysical Data:

 

Source: Geological overview, Schlüter, 2008

 


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