A late Neoproterozoic paleomagnetic pole for the Congo craton: Tectonic setting, paleomagnetism and geochronology of the Nola dike swarm (Central African Republic)

Moloto-A-Kenguemba, G.; Trindade, R. I.; Monié, Patrick; Nédélec, Anne; Siqueira, Roberto

doi:10.1016/j.precamres.2008.05.005

Cited by 47 publications

(13 citation statements)

References 19 publications

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“…Despite the extremely poor outcrop conditions, it could be estimated that these dykes measure a few tens of meters in thickness and extend for about a kilometer along strike. Similar doleritic dykes have been studied by Vicat et al (1997) and Moloto-A-Kenguemba et al (2008) in the neighboring region of Nola (Fig. 1), and by Poidevin (1979) in the region of Lobaye.…”

Section: Local Geologysupporting

confidence: 72%

“…The pelite-quartzite transition is gradual and follows the original sedimentary bedding. These metasedimentary formations are in continuity with the Nola series, which are considered by Lescuyer and Milési (2004) and Moloto-A-Kenguemba et al (2008) as being of Paleoproterozoic age.…”

Section: Local Geologymentioning

confidence: 57%

“…Based on their chemical composition, the Nola dolerites are related to an olivine tholeiite series of continental tholeiite chemical affinity. They were assigned an age of 571 ± 6 Ma ( 40 Ar / 39 Ar on amphibole, Moloto-A- Kenguemba et al, 2008).…”

Section: Local Geologymentioning

confidence: 99%

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Gold mineralization related to Proterozoic cover in the Congo craton (Central African Republic): A consequence of Panafrican events

Kpeou

Béziat

Salvi

et al. 2020

Journal of African Earth Sciences

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Despite its high endowments, the gold mining potential of Central African greenstone belts is seemingly underrated when compared to equivalent belts in neighbor West Africa. This is probably because, over the past half century, only minor exploration efforts were ever made in this region. In the southwest of the Central African Republic, near the locality of Moboma, gold-bearing quartz veins are hosted in greenschist facies Paleoproterozoic formations that are intruded by numerous dolerite dykes. These rocks occur in a strongly deformed terrane that marks the front of the Panafrican Oubanguides nappe, developed during an E-W regional shortening. Presence of multiple banding indicates repeated reactivation of the quartz veins and circulation of H 2 O-CO 2-NaCl fluids, similar to those characterizing typical orogenic gold-bearing settings. Fluid inclusion petrography and microthermometry permitted to distinguish two different fluids: one, aqueous-carbonic, circulated at relatively high temperature (Th = 250-270 °C) and was responsible for the main stage of Au deposition; a second fluid of low-salinity trapped in microcracks and in a late quartz generation, interpreted as meteoric, precipitated silver-poor native gold. At a later stage, supergene alteration caused the formation of discrete gold nuggets in the upper levels of the mineralization. The competent nature of the dolerite dykes and quartzite intersected by these quartz veins contributed to focus rock fracturing, localizing fluid circulation and the mineralization. The alteration assemblage developed in the veins is equivalent to that found in the dolerite dykes, which was dated at 571 Ma, thus pointing to a Panafrican age for the mineralization at Moboma.

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Section: Local Geologysupporting

confidence: 72%

Section: Local Geologymentioning

confidence: 57%

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Gold mineralization related to Proterozoic cover in the Congo craton (Central African Republic): A consequence of Panafrican events

Kpeou

Béziat

Salvi

et al. 2020

Journal of African Earth Sciences

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“…The onset of subduction at approximately 595-590 Ma along the northern margin of the Khomas Ocean and/or the southernmost margin of Adamastor Ocean [Prave, 1996;Gray et al, 2008;Rapela et al, 2011] due to the convergence of the Kalahari Craton may provide a satisfactory explanation for this process (Figure 8c), as documented by Lehmann et al [2015]. This plate reorganization could be further supported by the sudden change in the apparent polar wander path of the Congo Craton observed after approximately 590 Ma [Moloto-A-Kenguemba et al, 2008]. An alternative hypothesis consists in considering a change during the postcollisional evolution of the Río de la Plata-Nico Pérez-Congo system.…”

Section: 1002/2015tc004052mentioning

confidence: 86%

“…[]. This plate reorganization could be further supported by the sudden change in the apparent polar wander path of the Congo Craton observed after approximately 590 Ma [ Moloto‐A‐Kenguemba et al ., ]. An alternative hypothesis consists in considering a change during the postcollisional evolution of the Río de la Plata‐Nico Pérez‐Congo system.…”

Section: Discussionmentioning

confidence: 99%

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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U‐Pb and Hf zircon (sensitive high‐resolution ion microprobe ‐SHRIMP‐ and laser ablation‐inductively coupled plasma‐mass spectrometry ‐LA‐ICP‐MS‐), Ar/Ar hornblende and muscovite, and Rb‐Sr whole rock‐muscovite isochron data from the mylonites of the Sarandí del Yí Shear Zone, Uruguay, were obtained in order to assess the tectonothermal evolution of this crustal‐scale structure. Integration of these results with available kinematic, structural, and microstructural data of the shear zone as well as with geochronological data from the adjacent blocks allowed to constrain the onset of deformation along the shear zone at 630–625 Ma during the collision of the Nico Pérez Terrane and the Río de la Plata Craton. The shear zone underwent dextral shearing up to 596 Ma under upper to middle amphibolite facies conditions, which was succeeded by sinistral shearing under lower amphibolite to upper greenschist facies conditions until at least 584 Ma. After emplacement of the Cerro Caperuza granite at 570 Ma, the shear zone underwent only cataclastic deformation between the late Ediacaran and the Cambrian. The Sarandí del Yí Shear Zone is thus related to the syncollisional to postcollisional evolution of the amalgamation of the Río de la Plata Craton and the Nico Pérez Terrane. Furthermore, the obtained data reveal that strain partitioning and localization with time, magmatism emplacement, and fluid circulation are key processes affecting the isotopic systems in mylonitic belts, revealing the complexity in assessing the age of deformation of long‐lived shear zones.

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The Assembly of Western Gondwana: Reconstruction Based on Paleomagnetic Data

Rapalini¹

2018

Regional Geology Reviews

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A late Neoproterozoic paleomagnetic pole for the Congo craton: Tectonic setting, paleomagnetism and geochronology of the Nola dike swarm (Central African Republic)

Cited by 47 publications

References 19 publications

Gold mineralization related to Proterozoic cover in the Congo craton (Central African Republic): A consequence of Panafrican events

Gold mineralization related to Proterozoic cover in the Congo craton (Central African Republic): A consequence of Panafrican events

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

The Assembly of Western Gondwana: Reconstruction Based on Paleomagnetic Data

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