scholarly journals Interpretation of Aeromagnetic Data to Investigate Crustal Structures of the Contact Congo Craton - Pan-African Belt at the Eastern Cameroon

2020 ◽  
Vol 9 (2) ◽  
pp. 48
Author(s):  
Olivier Ulrich Igor Owono Amougou ◽  
Théophile Ndougsa Mbarga ◽  
Arsène Meying ◽  
Jean Marcel Abate Essi ◽  
Jean Aimé Mono ◽  
...  
Keyword(s):  
Central Africa ◽  
Analytical Signal ◽  
Vertical Gradient ◽  
Aeromagnetic Data ◽  
Fold Belt ◽  
Pan African ◽  
Crustal Structures ◽  
History Of ◽  
Points Of View ◽  
Eastern Cameroon

The collision between the Congo Craton and the Pan African fold belt of Central Africa had great impacts on the geological and tectonic points of view, notably the installation of several tectonic accidents such as faults, fractures, dikes, folds, domes. This aeromagnetic study is based on Paterson's aeromagnetic data interpretations through the use of multiple operators. These data were processed by Oasis Montaj software. The total magnetic intensity map reduced to the equator (RTE-TMI) shows important anomalies features the major important regional anomalies. Maps of the vertical gradient, analytical signal and tilt angle maps have meanwhile highlighted several short wavelength anomalies assimilated to folding, dykes, fractures or faults. The map of maxima upward to 2 km allowed to establish the structural map of the study area. It turns out that the different types of geological accidents follow ENE-WSW, ESE-WNW, NE-SW, NW-SE and even E-W and N-S directions. All these directions are very similar to the geological history of the area. Anything that seems to confirm that the study area was the scene of intense tectonic movements resulting from the collision between the Congo Craton and the Central Africa Fold Belt.

Outline of the geochronology and tectonic units of the basement complex of northeast Africa

1976 ◽  
Vol 350 (1660) ◽  
pp. 127-141 ◽  
Keyword(s):  
Regional Metamorphism ◽  
Central Africa ◽  
Geological Mapping ◽  
Fold Belt ◽  
Basement Complex ◽  
Southern Sudan ◽  
Pan African ◽  
Mozambique Belt ◽  
Unknown Area ◽  
Eastern Uganda

Results of new geological mapping with the help of air and satellite photo­graphy in Sudan together with information from adjacent territories has enabled a map to be drawn showing the dominant basement tectonic trends in a previously geologically unknown area. Over 100 age deter­minations, including 25 unpublished analyses, allow the recognition of Eburnian age events in Central Africa Republic and southeast Libya similar to the 1950 million year (Ma) old Ruwenzori Belt in Uganda and similar events in Zaire. A northeast trending fold belt is recognized in Central Africa, western Sudan and southeast Egypt in which 1000 Ma ages are found. The Pan African age Mozambique belt truncates older structures in eastern Uganda and southern Sudan but is covered by a greenschist volcanic assemblage along the Red Sea coast in which 550 ± 150 Ma old granites and regional metamorphism occur.

A history of botanical collections in the Luangwa Valley, Zambia

1998 ◽  
Vol 25 (2) ◽  
pp. 283-291
Author(s):  
P.S.M. PHIRI ◽  
D.M. MOORE
Keyword(s):  
Eighteenth Century ◽  
Environmental Impact ◽  
Impact Assessment ◽  
Vascular Plants ◽  
Central Africa ◽  
Peak Activity ◽  
Historical Account ◽  
History Of ◽  
The 1960S ◽  
Made In

Central Africa remained botanically unknown to the outside world up to the end of the eighteenth century. This paper provides a historical account of plant explorations in the Luangwa Valley. The first plant specimens were collected in 1897 and the last serious botanical explorations were made in 1993. During this period there have been 58 plant collectors in the Luangwa Valley with peak activity recorded in the 1960s. In 1989 1,348 species of vascular plants were described in the Luangwa Valley. More botanical collecting is needed with a view to finding new plant taxa, and also to provide a satisfactory basis for applied disciplines such as ecology, phytogeography, conservation and environmental impact assessment.

From Stonehenge to Samarkand

2006 ◽  
Author(s):  
Brian Fagan
Keyword(s):  
Gustave Flaubert ◽  
Central Africa ◽  
British Museum ◽  
Holy Land ◽  
Cruise Ship ◽  
Modern Times ◽  
Ancient Civilization ◽  
Machu Picchu ◽  
History Of ◽  
The Silk Road

Ever since Roman tourists scratched graffiti on the pyramids and temples of Egypt over two thousand years ago, people have traveled far and wide seeking the great wonders of antiquity. In From Stonehenge to Samarkand, noted archaeologist and popular writer Brian Fagan offers an engaging historical account of our enduring love of ancient architecture--the irresistible impulse to visit strange lands in search of lost cities and forgotten monuments. Here is a marvelous history of archaeological tourism, with generous excerpts from the writings of the tourists themselves. Readers will find Herodotus describing the construction of Babylon; Edward Gibbon receiving inspiration for his seminal work while wandering through the ruins of the Forum in Rome; Gustave Flaubert watching the sunrise from atop the Pyramid of Cheops. We visit Easter Island with Pierre Loti, Machu Picchu with Hiram Bingham, Central Africa with David Livingstone. Fagan describes the early antiquarians, consumed with a passionate and omnivorous curiosity, pondering the mysteries of Stonehenge, but he also considers some of the less reputable figures, such as the Earl of Elgin, who sold large parts of the Parthenon to the British Museum. Finally, he discusses the changing nature of archaeological tourism, from the early romantic wanderings of the solitary figure, communing with the departed spirits of Druids or Mayans, to the cruise-ship excursions of modern times, where masses of tourists are hustled through ruins, barely aware of their surroundings. From the Holy Land to the Silk Road, the Yucatán to Angkor Wat, Fagan follows in the footsteps of the great archaeological travelers to retrieve their first written impressions in a book that will delight anyone fascinated with the landmarks of ancient civilization.

‘A great deal of historical claptrap’

2018 ◽  
Author(s):  
Martha Vandrei
Keyword(s):  
History Of ◽  
Points Of View

This chapter’s focus is the later nineteenth and early twentieth centuries, during which Boudica was immortalized in Thomas Thornycroft’s statue on Westminster Bridge. This chapter seeks to provide a thick and thorough contextualization of this event and its precursors, focusing in particular on Boudica’s role in the history of London, but also on Thornycroft’s own motivations and preoccupations, which have been overlooked by historians. This chapter also explores the first novelization of Boudica’s deeds, a firmly imperialistic account by Marie Trevelyan. This period has been read as the climax of Boudica’s association with imperial greatness—a connection I do not seek to wholly refute. However, Thornycroft’s own understanding of his statue challenges this, while Trevelyan’s conviction was met with credulity by contemporaries. Focusing on these hitherto overlooked points of view sheds light on the complicated relations between pasts and presents.

A History of South and Central Africa

1977 ◽  
Vol 3 ◽  
pp. 6
Author(s):  
Bridglal Pachai ◽  
Derek Wilson
Keyword(s):  
Central Africa ◽  
History Of
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