Origin of Iforas alkaline ring complexes in the Pan-African context

1985 ◽  
Vol 3 (1-2) ◽  
pp. 276
Author(s):  
Monique A. Bedasse

This chapter sets the pan-African context in which the repatriation occurs. In particular, it explains the rise of Tanzania as a safe haven for African freedom fighters and radical diasporic Africans in the 1960s and 1970s, connecting the repatriation to wider diasporic engagement with Tanzania in this period. It places ujamaa within the context of other African socialisms of the day and highlights the role of pan-Africanism in the making of Tanzania’s modern history.


Author(s):  
Noudiedie Kamgang Julie Agathe ◽  
Tcheumenak Kouémo Jules ◽  
Kagou Dongmo Armand ◽  
Fozing Éric Martial ◽  
Choumélé Kana Styve Cliff ◽  
...  

The Cameroon Line (CL) appears as a SW-NE straight line characterized by an intense volcanic activity of basaltic composition with alkaline plutonic complexes, including the Nlonako ring complex (NRC) emplaced in the southern part of the CL. Many hypotheses have been proposed to explain the origin and petrogenetic evolution of these complexes but very few of these works focus or attempt to propose their structural emplacement model, though structural data recorded by them can permit such studies. Using petrographic, structural data and space images, we propose an emplacement model of the NRC and other ring complexes along the CL. The NRC is a ring complex of 10 km diameter slightly elongated in the NNE-SSW direction mainly composed of plutonites among which syenites, gabbros, diorites and biotite-amphibole granites, and a few volcanites made up of rhyolites and basalts occurring as veins or boulders in syenites. This complex was emplaced as sill intrusive body within Pan-African k-feldspars megacrysts granites and gneiss host rocks under fractures control. These fractures developed as result of stress release consecutive to the readjustment of the crust during and after the late Cretaceous general extension, therefore facilitating the upwelling of the mantle plume and the generation of magma that vertically uplift. The progressive magmatic pressure decreases after the NRC emplacement in addition to conjugated fractures networks developed at superficial crust level finally lead to the cauldron subsidence of the NRC summit. This subsidence was facilitated by the downward sliding of rocks along the WNW-ESE fault, finally leading to the formation of a caldera at the summit of the NRC. The NRC and other anorogenic complexes aligned along the CL are located in a tension gash form by the Cretaceous sinistral activation of the N70E Adamawa fault. This left lateral wrench movements developed a tension gash, overprinted on pre-existing transcurrent mega-faults with as result, the development of "en-echelon" fractures. Stress release during the late Cretaceous general extensional phase probably accelerated the uplift of magmas and emplacement of ring complexes along the "en-echelon" regional fractures in an extensional setting during the Tertiary (60 - 30 Ma). This therefore explained the alignment of anorogenic complexes along the N30E CL corridor that are highly correlated to lineament networks and Pan-African megafaults


2015 ◽  
Vol 124 (3) ◽  
pp. 527-539 ◽  
Author(s):  
Aretouyap Zakari ◽  
Nouayou Robert ◽  
Njandjocknouck Philippe ◽  
Asfahani Jamal
Keyword(s):  

Author(s):  
Belinda Bedell ◽  
Nicholas Challis ◽  
Charl Cilliers ◽  
Joy Cole ◽  
Wendy Corry ◽  
...  

2018 ◽  
Vol 27 (1) ◽  
Author(s):  
Cynthia Miller-Naudé ◽  
Jacobus A Naudé

The concern of the paper is to highlight how computational analysis of Biblical Hebrew grammar can now be done in very sophisticated ways and with insightful results for exegesis. Three databases, namely, the Eep Talstra Centre for Bible and Computer (ETCBC) Database, the Accordance Hebrew Syntactic Database, and the Andersen-Forbes Syntactic Database,are compared in terms of their relation to linguistic theory (or, theories), the nature and spectrum of retrieved data, and the representation of synchronic and diachronic linguistic variation. Interaction between different contexts, including the African context, are promoted namely between linguists working on Biblical Hebrew and exegetes working on the Hebrew Bible by illustrating how exegesis and language are intimately connected, as well as among geographical contexts by comparing a European database (ETCBC), a North American database (Accordance) and a Southern hemisphere database (Andersen-Forbes).


Author(s):  
Kwaku Osei-Hwedie ◽  
Doris Akyere Boateng

As the discussions and debates rage on about the content and direction of social work in Africa, the challenges associated with weaning the profession off its Western and North American roots become apparent. The desire to indigenise or make the profession culturally relevant is well articulated in the literature. Some efforts have been undertaken toward achieving this desire. However, it is evident that despite the numerous discussions and publications, it appears that efforts at indigenising, localising, or making social work culturally relevant have not made much progress. While what must be achieved is somewhat clear; how to achieve it and by what process remain a conundrum. The article, therefore, revisits the issue of making social work culturally relevant in Africa and its associated challenges. Despite the indictment of current social work education and practice in Africa, it appears that many academics and professionals have accepted that what is Western is global, fashionable, and functional, if not perfect. Given this, perhaps, “we should not worry our heads” about changing it. Instead, social work educators and practitioners in Africa should go back to the drawing board to determine how current social work education and practice can be blended with a traditional African knowledge base, approaches and models to reflect and align with the critical principles and ideals within the African context. This is with the hope of making the profession more relevant to the needs of the people of Africa.


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