Evolution of the Mayo Kebbi region as revealed by zircon dating: An early (ca. 740Ma) Pan-African magmatic arc in southwestern Chad

Pénaye, Joseph; Kröner, Alfred; Toteu, S.F.; Schmus, W. R. Van; Doumnang, Jean-Claude

doi:10.1016/j.jafrearsci.2005.11.018

Cited by 161 publications

(119 citation statements)

References 22 publications

(32 reference statements)

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“…Petrological and structural similarities between Mongo [8], Mayo Kebbi [4,7] and Léré basements in Southern Chad [5] suggest that these regions are parts of the same terrane, which was welded during the Pan-African orogeny to the Adamawa-Yadé Domain [21], i.e. outside of the "Saharan metacraton".…”

Section: Field Evidencementioning

confidence: 99%

“…outside of the "Saharan metacraton". The NNE-SSW, NE-SW and ENE-WSW trending brittle structures could have formed between 740 and 737 Ma [4].…”

Section: Field Evidencementioning

confidence: 99%

“…Precambrian massifs are exposed in Chad as five terranes (review in [1]): Tibesti to the north [2], Waddai to the east, Mbaibokoum, or Yade, to the south [3], Mayo Kebbi to the south-west [4][5][6][7] ( Figure 1A) and Guéra to the south [8]. Mayo-Kebbi and Mbaibokoum/Yade constitute terranes of the Neoproterozoic Central African Orogenic Belt (CAOB) [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Mayo-Kebbi and Mbaibokoum/Yade constitute terranes of the Neoproterozoic Central African Orogenic Belt (CAOB) [4,5]. Tibesti, Waddaï and Guera are parts of a large area coined by [9] as the "Saharan Metacraton", defined as "a craton that has been remobilized during an orogenic event but that is still recognizable dominantly through its rheological, geochronological and isotopic characteristics" [9].…”

Section: Introductionmentioning

confidence: 99%

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The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

et al. 2017

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Dolerite dykes are widespread in the Mongo area within the granitic Guéra Massif (Chad, Central Africa). Dykes are several hundred metres to several kilometres long, a metre to decametre thick, and vertical, crosscutting the Pan-African granitic basement rocks. They are controlled by major Pan-African NNE-SSW, NE-SW and ENE-WSW faults. Rocks constituting the dykes exhibit typical doleritic textures (i.e. intergranular, ophitic or subophitic). They are mainly composed of phenocrysts, microcrysts and microlites of clinopyroxene, amphibole, plagioclase, alkali feldspar and Fe-Ti oxides. Mongo dolerites are classified into two groups: Group 1 of basalt and trachybasalt and Group 2 of basaltic trachyandesite, which follow a trend with continental tholeiite affinities, and are differentiated through fractional crystallization. Trace element enrichment and REE contents show the high melting degree at shallow depths of enriched sub-continental lithospheric mantle, whose composition is intermediate between OIB and MORB, contaminated by small amounts of sediment during older subduction. Mongo dolerites are interpreted as imprints of either the final stage of stabilization of ancient continental crust, or the initiation of tectonic activity related to Pan-African mobile belts.

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Section: Field Evidencementioning

confidence: 99%

“…outside of the "Saharan metacraton". The NNE-SSW, NE-SW and ENE-WSW trending brittle structures could have formed between 740 and 737 Ma [4].…”

Section: Field Evidencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

et al. 2017

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“…Structural analysis of metamorphic and magmatic terranes is commonly used to characterise the tectonic evolution, define magmatism and deformation history in the orogens [1,2,3,4]. The Central African Orogenic Belt (CAOB; Figure 1a) also called the North Equatorial Fold Belt [1,5,6] result from the convergence and collision between the Congo-São Francisco cratons, West African craton and Saharan metacraton [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Nicaise¹,

Tchameni²,

Emmanuel³

et al. 2018

JGG

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Late Cretaceous intraplate silicic volcanic rocks from the Lake Chad region: An extension of the Cameroon volcanic line?

Shellnutt

Lee

Torng³

et al. 2016

Geochem Geophys Geosyst

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Silicic volcanic rocks at Hadjer el Khamis, near Lake Chad, are considered to be an extension of the Cameroon volcanic line (CVL) but their petrogenetic association is uncertain. The silicic rocks are divided into peraluminous and peralkaline groups with both rock types chemically similar to within‐plate granitoids. In situ U/Pb zircon dating yielded a mean 206Pb/238U age of 74.4 ± 1.3 Ma indicating the magmas erupted ∼10 million years before the next oldest CVL rocks (i.e., ∼66 Ma). The Sr isotopes (i.e., ISr = 0.7021–0.7037) show a relatively wide range but the Nd isotopes (i.e., 143Nd/144Ndi = 0.51268–0.51271) are uniform and indicate that the rocks were derived from a moderately depleted mantle source. Thermodynamic modeling shows that the silicic rocks likely formed by fractional crystallization of a mafic parental magma but that the peraluminous rocks were affected by low temperature alteration processes. The silicic rocks are more isotopically similar to Late Cretaceous basalts identified within the Late Cretaceous basins (i.e., 143Nd/144Ndi = 0.51245–0.51285) of Chad than the uncontaminated CVL rocks (i.e., 143Nd/144Ndi = 0.51270–0.51300). The age and isotopic compositions suggest the silicic volcanic rocks of the Lake Chad region are related to Late Cretaceous extensional volcanism in the Termit basin. It is unlikely that the silicic volcanic rocks are petrogenetically related to the CVL but it is possible that magmatism was structurally controlled by suture zones that formed during the opening of the Central Atlantic Ocean and/or the Pan‐African Orogeny.

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Evolution of the Mayo Kebbi region as revealed by zircon dating: An early (ca. 740Ma) Pan-African magmatic arc in southwestern Chad

Cited by 161 publications

References 22 publications

The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Late Cretaceous intraplate silicic volcanic rocks from the Lake Chad region: An extension of the Cameroon volcanic line?

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