The Cambrian volcano-sedimentary formations of the westernmost High Atlas (Morocco): their place in the geodynamic evolution of the West African Palaeo-Gondwana northern margin

2008 ◽  
Vol 297 (1) ◽  
pp. 303-327 ◽  
Author(s):  
A. Pouclet ◽  
H. Ouazzani ◽  
A. Fekkak
Keyword(s):  
West African ◽  
Geodynamic Evolution ◽  
The West ◽  
High Atlas ◽  
Northern Margin

scholarly journals The Late Neoproterozoïc Continental Tholeiitic Basalts of the Toubkal Inlier (Western High-Atlas, Morocco): A Post-Pan-African Rifting Witness in the Northern Margin of the West African Craton

2016 ◽  
Vol 06 (08) ◽  
pp. 509-516 ◽  
Author(s):  
Ghalem Zahour ◽  
Hassan El Hadi ◽  
Abdelfatah Tahiri ◽  
Youssef Zerhouni ◽  
Saida Alikouss ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
High Atlas ◽  
Northern Margin ◽  
Pan African

Interprétation géodynamique du domaine pan-africain (Précambrien terminal) de l'Anti-Atlas (Maroc) à partir de données géologiques et géochronologiques

1980 ◽  
Vol 17 (1) ◽  
pp. 142-155 ◽  
Author(s):  
M. Leblanc ◽  
J. R. Lancelot
Keyword(s):  
Continental Margin ◽  
Active Continental Margin ◽  
West African ◽  
The Other ◽  
Geochronological Data ◽  
Geodynamic Evolution ◽  
The West ◽  
West African Craton ◽  
Northern Margin ◽  
Pan African

U–Pb and Rb–Sr ages performed in the Anti-Atlas (Morocco), especially in Bou Azzer area, demonstrate a Pan-African orogeny (680–570 Ma), along the northern margin of the West African craton (2000 Ma). Geological and geochronological data allow the reconstitution of a coherent succession of events of Pan-African ages. The geodynamic evolution of this domain comprises a stage of oceanic opening (ophiolites) followed with a stage of closure: obduction of the ophiolites on the craton, then subduction under an active continental margin. This segment of the Pan-African belt can be correlated with the other parts of the belt, located on the eastern margin of the West African craton.

scholarly journals Early Neoproterozoic oxygenation dynamics along the northern margin of the West African Craton, Anti-Atlas Mountains, Morocco

2021 ◽  
pp. 120404
Author(s):  
Ernest Chi Fru ◽  
Olabode Bankole ◽  
Ibtissam Chraiki ◽  
Nassrddine Youbi ◽  
Marc-Alban Millet ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Northern Margin ◽  
Atlas Mountains ◽  
Early Neoproterozoic

scholarly journals Unraveling a distal segment of the West African Craton Paleozoic margin: Stratigraphy of the Mougueur inlier of the eastern High Atlas, Morocco

2018 ◽  
Vol 350 (6) ◽  
pp. 289-298 ◽  
Author(s):  
Hassan Ouanaimi ◽  
Abderrahmane Soulaimani ◽  
Lahssen Baidder ◽  
Abderrazzak Eddebbi ◽  
Christian Hoepffner
Keyword(s):  
Distal Segment ◽  
West African ◽  
The West ◽  
West African Craton ◽  
High Atlas

Discussion on “From Pan-African transpression to Cadomian transtension at the West African margin: New U-Pb zircon ages from the Eastern Saghro Inlier (Anti-Atlas, Morocco)” by Errami et al. 2020 (GSL-SP 503, 209-233)

2021 ◽  
pp. jgs2020-206
Author(s):  
M. Ikenne ◽  
A. Bekker ◽  
R.E. Ernst ◽  
N. Youbi ◽  
A. Ait Lahna ◽  
...  
Keyword(s):  
West African ◽  
Age Difference ◽  
Geodynamic Evolution ◽  
The West ◽  
Mafic Magmatism ◽  
Tectonic Events ◽  
Pan African ◽  
Age Constraints ◽  
Published Paper ◽  
Mixed Carbonate

Recent U-Pb igneous ages obtained in the SW Domain of the Anti-Atlas are not consistent with the model proposed in the recently published paper by Errami et al. (2020). The formations of the Taghdoute and Lkest groups in the SW Domain, also known as the “limestones and quartzites” series, were previously considered to have a Cryogenian age due to similarities with the series of limestone and quartzite of the Tachddamt Bleida Formation in the Bou-Azzer Inlier located in the NE Domain of the Anti-Atlas. However, recent U-Pb ages on zircon and baddeleyite of 1.71-1.65 Ga obtained on intrusive sills and dykes in the Taghdoute and Lkest groups, constrain this sedimentary series of the SW Domain to be approximately 1 Ga older than previously thought. Absence of Paleoproterozoic series in the NE Domain combined with the available age constraints suggests that it has a Pan-African age. However, recent 1.71-1.65 Ga ages of mafic magmatism in the SW Domain conflict with the previously inferred Tonian to Cryogenian age for the mixed carbonate-siliciclastic series of the Taghdoute and Lkest groups and raises uncertainty about the age of tectonic events previously attributed to the Pan-African Orogeny in this part of the Anti-Atlas. Furthermore, the age difference between the NE and SW domains of the Anti-Atlas suggests their independent geodynamic evolution before the Ediacaran Period.

Reply to discussion on “From Pan-African transpression to Cadomian transtension at the West African margin: New U-Pb zircon ages from the Eastern Saghro Inlier (Anti-Atlas, Morocco)” by Ikenne et al. 2020 (GSL-SP, 503, 209-233)

2021 ◽  
pp. jgs2021-034
Author(s):  
Ezzoura Errami ◽  
Ulf Linnemann ◽  
Jamal El Kabouri ◽  
Mandy Hofmann ◽  
Andreas Gärtner ◽  
...  
Keyword(s):  
West African ◽  
Ultramafic Rocks ◽  
Geodynamic Evolution ◽  
The West ◽  
West African Craton ◽  
Zircon Age ◽  
Pan African ◽  
Stratigraphic Position ◽  
Age Constraints ◽  
Early Neoproterozoic

The comment of Ikenne et al. concerns recently described U-Pb baddeleyite ages, around 1.71 and 1.65 Ga, obtained on intrusive sills and dykes in the Taghdout-Lkest Group in the SW domain of the Anti-Atlas (AA). These authors suggest an independent geodynamic evolution of the eastern and western domains of the Anti-Atlas prior to the Ediacaran period. Furthermore, they state that we do not take this magmatic event into account when interpreting our data. We like to emphasize that this is beyond the scope of our paper and does not affect our interpretation of the AA evolution during the deposition of the Ediacaran sedimentary successions (Saghro, Mgouna, and Ouarzazate goups). We agree with the comment that we did not distinguish the Taghdout-Lkest from the Bleida-Tachdamt groups and now we separate them in the revised figure 2. The different geodynamic evolution of the SW and NE Anti-Atlas domains in pre-Ediacaran times sensu Ikenne et al., is not consistent with abundant inherited Paleoproterozoic zircon detritus and Nd model ages (0.80-1.82 Ga) from the northeastern Anti-Atlas and the Meseta. There is no doubt about Late Paleoproterozoic baddeleyite ages, but they do not have an analogue in the zircon age record of the West African Craton, which is expected from ultramafic rocks with few zircon grains. However, they locally allow assuming a Late Paleoproterozoic deposition of the lower Taghdout-Lkest Group. Any age constraints for the upper parts of this group are lacking, thus allowing a hypothetic deposition between ca. 1.65 Ga and 0.83 Ga (the assumed age of initial Bleida-Tachdamt Group deposition). Therefore, it is very important to close the gap in detailed stratigraphic studies that would allow differentiating between the different Late Paleoproterozoic and Early Neoproterozoic events including the stratigraphic position of the upper Taghdout-Lkest Group and Bleida-Tachdamt group.

Données nouvelles sur le protérozoïque inférieur du domaine nord-armoricain (France): age et signification

1980 ◽  
Vol 17 (4) ◽  
pp. 532-538 ◽  
Author(s):  
Bernard Auvray ◽  
René Charlot ◽  
Philippe Vidal
Keyword(s):  
West African ◽  
The Other ◽  
The West ◽  
West African Craton ◽  
Northern Margin ◽  
The North ◽  
Upper Proterozoic ◽  
Lower Proterozoic ◽  
Proterozoic Basement ◽  
Armorican Massif

Orthogneisses from the Tregor area of the North Armorican Massif have been dated using the U/Pb method on zircons. Ages of between 1.8 and 2.0 Ga have been obtained, thus significantly extending the known size of the Lower Proterozoic basement in this area. It is argued that the presence of such a substantial area of basement is a further argument for an Upper Proterozoic (Brioverian) south-dipping subduction zone which was located to the north of the Armorican Massif. On the other hand, the similarities between the North Armorican block and the northern margin of the West African craton during the Proterozoic are emphasized.

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