Tectono-magmatic reactivation of Téfidet Cretaceous trough during Cenozoic (Aïr, Niger)

2016 ◽  
Vol 187 (2) ◽  
pp. 73-82 ◽  
Author(s):  
Yacouba Ahmed ◽  
Moussa Konaté ◽  
Moussa Harouna
Keyword(s):  
Volcanic Activity ◽  
Upper Jurassic ◽  
South Atlantic ◽  
The South ◽  
Lake Chad ◽  
Pan African ◽  
The Relationship ◽  
Extension Period

AbstractThe Téfidet trough (eastern Niger) belongs to the Ténéré megasystem set of Cretaceous rifts N130°E to N170°E oriented, corresponding to the direction of the Lake Chad-Hoggar tectonic axis.The study of the relationship between the structure of the trough and alkaline fissural volcanism that developed there from the Oligocene to Plio-Quaternary shows the uniqueness of the Téfidet trough compared to the neighboring contemporary volcanic areas of Hoggar, Cameroon, and southern Aïr.The tectono-magmatic reactivation of the Cretaceous Téfidet trough developed in two steps: – a period contemporaneous with the Tuareg shield bulging (Aïr, Hoggar, Iforas);– a subsequent extension period generally N060°E, which has persisted since the opening of the South Atlantic (upper Jurassic to Plio-Quaternary).The fissural volcanism, due to the reactivation of Pan African and Cretaceous faults evolved concomitantly with the N060°E extension (syn-magmatic micro-fractures with basaltic filling), in several steps, from Oligocene to Plio-Quaternary.This study highlights the existence of periods of quietness and recovery of volcanic activity, for which two assumptions can be made: – no enough absolute datings,– apolyphased extension of the rift.The latter hypothesis seems to be supported by three periods of volcanic quietness, 28–24 m.y., 20–14 m.y. and 8–5 m.y., observed in the northern and the southern Aïr, Gréboun and Todgha, respectively.

Marvelous Autocrats

2017 ◽  
Author(s):  
Magalí Armillas-Tiseyra
Keyword(s):  
Magical Realism ◽  
Global South ◽  
South Atlantic ◽  
Narrative Form ◽  
The South ◽  
Textual Features ◽  
Relationship Of ◽  
The Relationship

This essay shows how the idea of the South Atlantic as a space of dictatorships and banana republics was contested on the ground by literary experimentation and transoceanic influence. Armillas- Tiseyra uses Sony Labou Tansi’s La vie et demie (Life and a Half 1979) as an example of a dictator novel, a genre that spans the Global South. Armillas-Tiseyra argues for the term “constellation” to be used in place of “magical realism” to classify the genre. “Constellation” here serves as a figure both for the relationship of individual texts or textual features to each other (a loose configuration or grouping) and for a mode of comparison that proceeds by juxtaposition and collage rather than more rigid hierarchical systematization. The allows Armillas-Tiseyra to approach and grapple with the difficult relationship between critique and narrative form.

‘A young slip of botany’: botanical networks, the South Atlantic, and Britain’s maritime worlds,c.1790–1810

2016 ◽  
Vol 11 (1) ◽  
pp. 24-43 ◽  
Author(s):  
John McAleer
Keyword(s):  
British Empire ◽  
South Atlantic ◽  
The South ◽  
Cape Of Good Hope ◽  
Network Building ◽  
Late Eighteenth ◽  
St Helena ◽  
The Relationship ◽  
Patterns Of Interaction ◽  
Maritime Empire

AbstractThis article explores the relationship between science and empire, through the prism of British botanical engagement with the South Atlantic in the late eighteenth and early nineteenth centuries. It investigates the logistics of plant exchanges, as information, expertise, and specimens followed the maritime contours of the British empire. The discussion traces the nascent network-building undertaken by officials, residents, and visitors on St Helena and at the Cape of Good Hope, and the exchange of plant specimens with London and, crucially, with other places around the empire. The article suggests that such activities offer perspectives on wider patterns of interaction with an area located at the crossroads of Britain’s maritime empire. In time, the region forged its own botanical networks and created alternative axes of exchange, association, and movement.

POLITICAL AND STRATEGIC COORDINATION AND COOPERATION FOR DEVELOPMENT: THE CASES OF ZPCSA AND GGC

2016 ◽  
Vol 31 (2) ◽  
pp. 19-36
Author(s):  
Paulo Fagundes Visentini ◽  
Analúcia Danilevicz Pereira
Keyword(s):  
South Atlantic ◽  
Strategic Orientation ◽  
International Affairs ◽  
The South ◽  
Strategic Issues ◽  
Strategic Coordination ◽  
Regional Order ◽  
Energy Products ◽  
A Site ◽  
Political Economic

The creation of the Zone of Peace and Cooperation of the South Atlantic (ZPCSA) in 1986 and the Gulf of Guinea Commission (GGC) in 2001 was about changes in the distribution of world power. This article argues that though they emerged at different times, their strategic orientation converges in a number of areas related to the significant interests in the South Atlantic as an area of stability in the region to be marked by strong political, economic and military ties. They also converge on the ideal for development, security and greater projection of power and influence in international affairs. The South Atlantic being a route of passage and trade, as a means of access and flow of energy products, the region became a site for new calculations of regional strategic powers about world affairs. The article also argues that ZPCSA and GGC are therefore crucial for the regional order and the development of higher capacities for cooperation on strategic issues. The actual point of convergence extends to ensuring the sovereignty through dialogue between the states in the region that are involved.

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