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Guera Massif

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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.
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.
Image
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.
Published: 01 June 2021
Figure 5. 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
Journal Article
Published: 01 June 2021
South African Journal of Geology (2021) 124 (2): 353–382.
...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. ...
FIGURES
First thumbnail for: Geochemical reconnaissance of the <span class="sea...
Second thumbnail for: Geochemical reconnaissance of the <span class="sea...
Third thumbnail for: Geochemical reconnaissance of the <span class="sea...
Journal Article
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
First thumbnail for: The enigmatic continental crust of North-Central A...
Second thumbnail for: The enigmatic continental crust of North-Central A...
Third thumbnail for: The enigmatic continental crust of North-Central A...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 30 June 2020
Lithosphere (2020) 2020 (1): 8825465.
... , 62 ]. The tectonomagmatic dichotomy is difficult to reconcile. However, compositionally similar rocks to the metagabbro are known to occur in postcollisional settings. The Late Ediacaran (~580 Ma) Kekem (Cameroon) and Guéra Massif (Chad) gabbros have low SiO 2 (45.7 to 51.0 wt%) and high TiO 2...
FIGURES
First thumbnail for: Formation of Anorthositic Rocks within the Blair R...
Second thumbnail for: Formation of Anorthositic Rocks within the Blair R...
Third thumbnail for: Formation of Anorthositic Rocks within the Blair R...
Journal Article
Published: 24 November 2020
Bulletin de la Société Géologique de France (2020) 191 (1): 34.
... the regional Pan-African deformation event, the oldest ages most probably represent inherited cores while the lowermost Cambrian age reflects igneous crystallization. A late Ediacaran igneous activity is known in the CAfOB and especially in the neighboring Guera Massif ( Shellnutt et al. , 2019 ) where...
FIGURES
First thumbnail for: Neoproterozoic magmatic evolution of the southern ...
Second thumbnail for: Neoproterozoic magmatic evolution of the southern ...
Third thumbnail for: Neoproterozoic magmatic evolution of the southern ...
Journal Article
Journal: Geophysics
Published: 29 September 2021
Geophysics (2021) 86 (6): B369–B388.
... lithospheric fracture zones ( Wilson et al., 1998 ). The Chad Basin is touched at its border by four major Precambrian massifs: the Mayo-Kebbi in the southwest, the Guéra in the south-center, the Quaddaï in the east, and the Tibesti in the north (Figure  1a and 1b ). Geochronology has been obtained...
FIGURES
First thumbnail for: Gravimetry and petrophysics for defining the intra...
Second thumbnail for: Gravimetry and petrophysics for defining the intra...
Third thumbnail for: Gravimetry and petrophysics for defining the intra...
Journal Article
Published: 06 May 2015
Geological Magazine (2015) 152 (6): 1073–1084.
... in the Tibesti Mountains north of N’Djamena, the Ouddai Massif at the eastern border and central areas of Chad, the Guera Massif in the centre and the Yade and Mayo Kebbi massifs in the south ( Fig. 2 a). The Tibesti, Ouddai and Guerra massifs and other pre-Neoproterozoic blocks of North...
FIGURES
First thumbnail for: Late Permian mafic rocks identified within the Dob...
Second thumbnail for: Late Permian mafic rocks identified within the Dob...
Third thumbnail for: Late Permian mafic rocks identified within the Dob...
Journal Article
Published: 19 August 2021
Mineralogical Magazine (2021) 85 (5): 784–807.
... collisional and post-collisional granites from the Guéra Massif, South-Central Chad . Frontiers in Earth Science , 8 , 1 – 17 . Piilonen P.C. , McDonald A.M. , Poirier G. , Rowe R. and Larsen A.O. ( 2013 ) Mafic minerals of the alkaline pegmatites in the Larvik plutonic...
FIGURES
First thumbnail for: Amphiboles and phyllosilicates in the A-type Mandi...
Second thumbnail for: Amphiboles and phyllosilicates in the A-type Mandi...
Third thumbnail for: Amphiboles and phyllosilicates in the A-type Mandi...
Image
Published: 19 August 2021
. and Iizuka Y. ( 2020 ) An assessment of the magmatic conditions of late Neoproterozoic collisional and post-collisional granites from the Guéra Massif, South-Central Chad . Frontiers in Earth Science , 8 , 1 – 17 . Piilonen P.C. , McDonald A.M. , Poirier G. , Rowe R
Image
Published: 19 August 2021
. and Iizuka Y. ( 2020 ) An assessment of the magmatic conditions of late Neoproterozoic collisional and post-collisional granites from the Guéra Massif, South-Central Chad . Frontiers in Earth Science , 8 , 1 – 17 . Piilonen P.C. , McDonald A.M. , Poirier G. , Rowe R
Journal Article
Journal: SEG Discovery
Published: 01 July 2009
SEG Discovery (2009) (78): 1–64.
... artisanal dia- Centamin has been exploring for gold Oil accounts for ~90% of exports. Gov- monds, especially from Baibokoum at the Sukari Hill gold project near ernment is seeking to develop mining and Guera. Marsa Alam on the Red Sea coast. and suggested it might buy diamonds Production is expected...