Évidences paléomagnétiques et paléontologiques en faveur d'une position antipodale du craton Ouest-Africain et de la Chine du Nord : conséquences paléogéographiques |
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| Authors: | Jean-Pierre Lefort Tahar A??fa Robert Bourrouilh |
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| Institution: | 1. Géosciences-Rennes, université Rennes-1, bât. 15, campus de Beaulieu, 35042 Rennes cedex, France;2. Laboratoire Cibamar, université Bordeaux-1, av. des Facultés, 33405 Talence cedex, France |
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| Abstract: | Reappraisal of the palaeomagnetic data previously published about the West African Craton and their comparison with the most recent information obtained on doleritic dykes and stromatolite-bearing formations allow us to propose, after a critical examination of the old geochronological data, a new path for the West African Craton between 2200 and 700 Ma. This path has been compared with that of eastern China (which can be simply divided into a northern and a southern China block) between 1400 and 700 Ma. We can observe that these two blocks show a common path before their accretion to the Rodinia super-continent. These two blocks, which were located close the equator and at the outboard of Rodinia at about 1000 Ma, were also characterized by identical stromatolitic assemblages. This result shows that West Africa and Eastern China represented the antipodal continental margins of Rodinia. One can also deduce from our data that the accretion of Rodinia mainly resulted from north–south-oriented displacements. To cite this article: J.-P. Lefort et al., C. R. Geoscience 336 (2004). |
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| Keywords: | craton Ouest-Africain Chine de l'Est Rodinia paléomagnétisme stromatolites West-African Craton eastern China Rodinia palaeomagnetism stromatolites |
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