Oclcs webjunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. The craton the bascment of thc westafrican craton outcrops along two large uplifts. Crystalline basement of the west african craton springerlink. Cambrian formations of fersiga southwestern tanezrouft. It consists essentially of migmatitic and mylonitic gneisses with basic intrusions and xenoliths.
In geodynamique du craton ouest africain central et oriental. Gold deposits as results of the westafrican craton geologic. Bayer author search for other works by this author on. The paleomagnetism data allow to put on a single line, the zednes mauritania, sassandra ivory coast and guri venezuela fault zones, the mylonites of which were dated. This proterozoic domain belongs to the man leo shield, southern part of west african craton wac. Case study of the ngouracolomines area, eastern cameroon. Other articles where west african craton is discussed. The west african craton, as defined by kennedy 1964, represents a very large area stabilized after the eburnean orogeny, 2150150 ma ago black and fabre 1983, bessoles 1983. These old rocks outcrop today in two separate shields. Dans ce travail, nous avons reconstitue levolution dun des plus grands cratons, le craton ouest africain. Lagencement des chaines panafricaines et hercynienne sur. Pdf les granitoides paleoproterozoiques des boutonnieres du.
Cette these porte sur lhistoire geologique paleoproterozoique du craton ouest. Numerous and frequentlyupdated resource results are available from this search. Possible existence of a single wafricanguyanan craton at the early proterozoic times and its possible extension. Cambrien, glacioeustatisme, phosphates, rebond isostatique, craton ouest africain. February 2010 lip of the month large igneous provinces. Geochronological and paleomagnetism data for southern west african craton and guyana shield in south america, are concordant and suggest the existence of a large unit grouping them during archean and lower proterozoic times. Cover sequences of the west african craton springerlink. West african craton geological region, africa britannica.
The pdf file you selected should load here if your web browser has a pdf reader plugin installed for example, a recent version of adobe acrobat reader if you would like more information about how to print, save, and work with pdfs, highwire press provides a helpful frequently asked questions about pdfs. The west african craton wac is one of the five cratons of the precambrian basement rock of africa that make up the african plate, the others being the kalahari craton, congo craton, saharan metacraton and tanzania craton. Cette these porte sur lhistoire geologique paleoproterozoique du craton ouest africain au nord du ghana, pendant lorogenese eburneenne 2. Nov 20, 2011 the timing of onset of modernstyle plate tectonics on earth is debated. The eglab massif, situated in the northern part of the west african craton wac, exhibits a specific eburnean evolution compared to that known in the southern part of the wac. Xi waxi3 est african exploration initiative stage 3 wa i. Carte geologique synthetique du craton ouest africain c. Heritage et evolution postpanafricains eds bitam, l. Ivoire indicate a succession of metasedimentary rocks micaschists with cordierite, silstones, graphitic sediments, sandstones with amphibolegarnet, etc.
The pdf file you selected should load here if your web browser has a pdf reader plugin installed for example, a recent version of adobe acrobat reader if you would like more information about how to print, save, and work with pdfs, highwire press provides a helpful frequently asked questions about pdfs alternatively, you can download the pdf file directly to your computer, from where it. Pdf geologie des mineralisations auriferes du gisement. Tectonic and magmatic activity was concentrated in mobile belts surrounding the stable areas and took place throughout the late. Leve gravimetrique du sudouest du craton ouestafricain. M paris wikipedia citation please see wikipedias template documentation for further citation fields that may be required. Le craton ouest africain est ceinture par des chaines mobiles constituees lors des orogeneses panafricaines 800 a 5001lla et hercynienne 300 a 250ma. The boad is organised by the central bank of west african states and its eight member governments. A multidisciplinary study, cambridge, cambridge university press, 1992 lire en ligne archive pdf, p. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel.
Structures, deformation mechanisms and tectonic phases. The present study, essentially based on a structural analysis at outcrop scale. Pdf the geophysical signatures of the west african craton. Vertical movements along the northern border of the west. Analysis of rocks in the west african metamorphic province, which is more than 2 gyr old, reveals that some minerals formed. Two major orogenic stages are recognized in the eglab massif.
The geophysical signatures of the west african craton. Craton ouestafricain, gisements dor, orogenese eburneenne, datation reos, westafrican craton, gold deposits, eburnean orogeny, reos dating, 551. The archean protion of the swac remains largely underexplored. It is shown that the data require the presence of a highly anomalous crustal structure 40. The west african craton is a very extensive portion of precambrian crust 4500000 km 2, stable since 1700 ma ago, bounded on all sides by more recent mobile belts mainly of panafrican age, such as the mauritanide fold belt fig.