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![Panorama across the central Ouaddaï Massif, showing the variable degrees of outcrop. (a) Granitoids and (b) migmatites comprising older gneissic components invaded by younger feldspar-bearing granitic patches. (c) Flat-lying early Paleozoic sediments (distant hills; view looking due east near Adré) unconformably covering the Precambrian basement (foreground with bushes).]()
![Geological map of Ouaddaï massif (modified from Gsell and Sonnet, 1960): the study area is located in the southern part of Ouaddaï.]()
![Representative rock types from the study area. (a) and (b) Undeformed megacrystic granite with large plagioclase phenocrysts from the base of the prominent inselberg Pic du Guéra (1613 m), Guéra Massif. (c) and (d) Undeformed granites with variably sized plagioclase phenocrysts from the Ouaddaï Massif. (e) Banded granite gneiss cut by open-folded aplite with internal cleavage subparallel to the foliation of the gneiss host. (f) Foliated granite (left) cut by undeformed aplite dyke (right). (g) Typical layered granite gneiss of the eastern Ouaddaï massif between Adré and Abeche (h) Granite gneiss with amphibolitic xenoliths; the internal fabric of the left-hand xenolith is cut at a high angle by the granite.]()
![(a) Position of cratons within Africa. (b) Schematic geological map of the Central Africa fold belt adapted from Milesi et al. (2004); Toteu et al. (2001, 2004) and Saha Fouotsa et al. (2019). Age of representative plutonic rocks are indicated as follow: pre- to syn-orogenic subalkaline rocks (> 600 Ma), anatectic peraluminous granites and post collisional high-K calc alkaline rocks (< 600 Ma). Inset in the Ouaddaï massif shows the location of map drawn in Figure 2. References are cited in the text.]()
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![Simplified geologic map of central Chad showing outcrop area of the Ouaddaï (Darfur) and Guéra massifs, with locations of samples described in this paper.]()
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Journal Article
Neoproterozoic magmatic evolution of the southern Ouaddaï Massif (Chad) Open Access
Publisher: Société Géologique de France
Published: 24 November 2020
Bulletin de la Société Géologique de France (2020) 191 (1): 34.
...Félix Djerossem; Julien Berger; Olivier Vanderhaeghe; Moussa Isseini; Jérôme Ganne; Armin Zeh This paper presents new petrological, geochemical, isotopic (Nd) and geochronological data on magmatic rocks from the poorly known southern Ouaddaï massif, located at the southern edge of the so-called...
FIGURES
Journal Article
Geochemical reconnaissance of the Guéra and Ouaddaï Massifs in Chad: evolution of Proterozoic crust in the Central Sahara Shield Available to Purchase
Journal: South African Journal of Geology
Publisher: Geological Society of South Africa
Published: 01 June 2021
South African Journal of Geology (2021) 124 (2): 353–382.
... to calling the central Sahara a “ghost” or “meta” craton, it should be called the Central Sahara Shield. † Deceased © 2021 Geological Society of South Africa. All rights reserved. 2021 Geological Society of South Africa The Darfur Massif in Chad (e.g., Ouaddaï) comprises a basement...
FIGURES
Image
Panorama across the central Ouaddaï Massif, showing the variable degrees of... Available to Purchase
in Geochemical reconnaissance of the Guéra and Ouaddaï Massifs in Chad: evolution of Proterozoic crust in the Central Sahara Shield
> South African Journal of Geology
Published: 01 June 2021
Figure 4. Panorama across the central Ouaddaï Massif, showing the variable degrees of outcrop. ( a ) Granitoids and ( b ) migmatites comprising older gneissic components invaded by younger feldspar-bearing granitic patches. ( c ) Flat-lying early Paleozoic sediments (distant hills; view looking
Image
Geological map of Ouaddaï massif (modified from Gsell and Sonnet, 1960 ): ... Open Access
in Neoproterozoic magmatic evolution of the southern Ouaddaï Massif (Chad)
> Bulletin de la Société Géologique de France
Published: 24 November 2020
Fig. 2 Geological map of Ouaddaï massif (modified from Gsell and Sonnet, 1960 ): the study area is located in the southern part of Ouaddaï.
Image
Representative rock types from the study area. ( a ) and ( b ) Undeformed m... Available to Purchase
in Geochemical reconnaissance of the Guéra and Ouaddaï Massifs in Chad: evolution of Proterozoic crust in the Central Sahara Shield
> South African Journal of Geology
Published: 01 June 2021
from the Ouaddaï Massif. ( e ) Banded granite gneiss cut by open-folded aplite with internal cleavage subparallel to the foliation of the gneiss host. ( f ) Foliated granite (left) cut by undeformed aplite dyke (right). ( g ) Typical layered granite gneiss of the eastern Ouaddaï massif between Adré
Image
(a) Position of cratons within Africa. (b) Schematic geological map of the ... Open Access
in Neoproterozoic magmatic evolution of the southern Ouaddaï Massif (Chad)
> Bulletin de la Société Géologique de France
Published: 24 November 2020
subalkaline rocks (> 600 Ma), anatectic peraluminous granites and post collisional high-K calc alkaline rocks (< 600 Ma). Inset in the Ouaddaï massif shows the location of map drawn in Figure 2 . References are cited in the text.
Journal Article
The enigmatic continental crust of North-Central Africa: Saharan Metacraton or Central Sahara Shield? Available to Purchase
Journal: South African Journal of Geology
Publisher: Geological Society of South Africa
Published: 01 June 2021
South African Journal of Geology (2021) 124 (2): 383–390.
... of geochronology and isotope geochemistry, is that the central Sahara region is a large, coherent craton that was ‘highly remobilized’ during the Late Neoproterozoic amalgamation of Gondwana and referred to as the Saharan Metacraton. However, new data from the Guéra, Ouaddaï, and Mayo Kebbi massifs and the Lake...
FIGURES
Image
Simplified geologic map of central Chad showing outcrop area of the Ouaddaï... Available to Purchase
in Geochemical reconnaissance of the Guéra and Ouaddaï Massifs in Chad: evolution of Proterozoic crust in the Central Sahara Shield
> South African Journal of Geology
Published: 01 June 2021
Figure 3. Simplified geologic map of central Chad showing outcrop area of the Ouaddaï (Darfur) and Guéra massifs, with locations of samples described in this paper.
Journal Article
Evidence for a 6000 km length NW–SE-striking lineament in northern Africa: the Tibesti Lineament Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 September 2000
Journal of the Geological Society (2000) 157 (5): 897–900.
..., the Hoggar Massif–Murzuk Basin confines, the southwestern Tibesti–Borkou area, the northern Ouaddai–northern Darfur, the Nuba–Melut region and the Anza Trough northern margin. Yet analysis of numerous geological maps and satellite images, which we cannot reproduce here, shows that the newly defined fault...
FIGURES
