Upper Precambrian and lowermost Plaeozoic correlatinos in West Africa and in the Western Part of Central Africa. Probable diachronism of the Late Precambrian tillite |
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Authors: | Max Deynoux Roland Trompette Norbert Clauer Jean Sougy |
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Institution: | (1) Laboratoire de Géologie dynamique, Université Aix-Marseille III, St-Jérôme, 13397 Marseille cedex 4, France;(2) LA 132 «Études géologiques W-africaines », Marseille;(3) Present address: Centre de Sédimentologie et Géochimie de la surface, Institut de Géologie, 1 rue Blessig, 67084 Strasbourg cedex, France |
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Abstract: | The Late Precambrian or Eocambrian and the lowermost part of Palaeozoic rocks of West Africa and of the Western half of Central Africa include two lithostratigraphic sequences of sediments which we can identify as well on the craton as in the orogenic belts. The lower sequence, argillaceous, green colour, sometimes flyschoid, begins with a tillite or a mixtite. The upper sequence made of reddish, mainly continental sandstones, represents in some areas the molasse of the Pan-African Fold Belt.These two sequences, and notably at the base of the first one the tillite horizon, seem to be older in the South (Katangan and West-Congolian Chains) than in the North (Adrar of Mauritania). This diachronism is thought to be related to polar wandering, the South pole having shifted in that interval of time from South-Africa to West of the Senegal coast.
Zusammenfassung Das obere Präkambrium oder Eokambrium und die Basis des Paläozoikums von Westafrika und im westlichen Teil von Zentralafrika sind aus zwei lithostratigraphischen Abfolgen gebildet, die gleichfalls auf den Kratonen und in den Gebirgsketten zu erkennen sind. Die untere feinklastische Abfolge, grün, manchmal flyschartig, beginnt mit einem Tillit oder einem Mixtit. Die obere rote, sandige Abfolge, kontinentalen Ursprungs, wird örtlich als eine von der pan-afrikanischen Orogenese gebildete Molasse angesehen.Diese beiden Abfolgen, besonders die Tillite, scheinen diachron und im Süden älter (Katangische und West-Kongolische Gebirgsketten) als im Norden (Adrar von Mauritanien) zu sein. Diese Verjüngung nach Norden kann mit einer Polwanderung in Verbindung gebracht werden; der Südpol zieht während dieser Zeit von Südafrika in das Gebiet westlich der senegalesischen Küste.
Résumé Le Précambrian terminal ou Eocambrien et la base du Paléozoïque de l'Afrique de l'Ouest et de la partie occidentale de l'Afrique centrale comprennent deux ensembles lithostratigraphiques identifiables aussi bien dans les couvertures cratoniques que dans les chaînes. L'ensemble inférieur, argileux, vert, parfois flyschoïde, débute par une tillite ou une mixtite. L'ensemble supérieur, gréseux, rouge, à dominante continentale, est interprété dans certaines zones comme la molasse de la chaîne pan-africaine. ces deux ensembles, et en particulier la tillite á la base du premier, semblent plus anciens au Sud (chaînes katangienne et ouest-congolience) qu'au Nord (Adrar de Mauritanie). Cet âge plus jeune vers le Nord va de Pair avec le mouvement du pôle sud, qui, â époque, se déplace de l'Afrique du Sud au large des côtes du Sénegal.
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![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![khcy](/content/u1m045108u430465/xxlarge1093.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![zhcy](/content/u1m045108u430465/xxlarge1078.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) , ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![yucy](/content/u1m045108u430465/xxlarge1102.gif) , ![kcy](/content/u1m045108u430465/xxlarge1082.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![yacy](/content/u1m045108u430465/xxlarge1103.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) , ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![bcy](/content/u1m045108u430465/xxlarge1073.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![zcy](/content/u1m045108u430465/xxlarge1079.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![shcy](/content/u1m045108u430465/xxlarge1096.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) -![acy](/content/u1m045108u430465/xxlarge1072.gif) ![fcy](/content/u1m045108u430465/xxlarge1092.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![kcy](/content/u1m045108u430465/xxlarge1082.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![zcy](/content/u1m045108u430465/xxlarge1079.gif) . ![Ocy](/content/u1m045108u430465/xxlarge1054.gif) ![bcy](/content/u1m045108u430465/xxlarge1073.gif) ![ecy](/content/u1m045108u430465/xxlarge1101.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) , ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![bcy](/content/u1m045108u430465/xxlarge1073.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) , ![kcy](/content/u1m045108u430465/xxlarge1082.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![zhcy](/content/u1m045108u430465/xxlarge1078.gif) ![ucy](/content/u1m045108u430465/xxlarge1091.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![khcy](/content/u1m045108u430465/xxlarge1093.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![ycy](/content/u1m045108u430465/xxlarge1099.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) , ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![yucy](/content/u1m045108u430465/xxlarge1102.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![shcy](/content/u1m045108u430465/xxlarge1096.gif) — ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![ycy](/content/u1m045108u430465/xxlarge1099.gif) ![khcy](/content/u1m045108u430465/xxlarge1093.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![bcy](/content/u1m045108u430465/xxlarge1073.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![Kcy](/content/u1m045108u430465/xxlarge1050.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![zcy](/content/u1m045108u430465/xxlarge1079.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![Kcy](/content/u1m045108u430465/xxlarge1050.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) —, ![chcy](/content/u1m045108u430465/xxlarge1095.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) — ![Acy](/content/u1m045108u430465/xxlarge1040.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![Mcy](/content/u1m045108u430465/xxlarge1052.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) . ![Tcy](/content/u1m045108u430465/xxlarge1058.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![kcy](/content/u1m045108u430465/xxlarge1082.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![zhcy](/content/u1m045108u430465/xxlarge1078.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![yacy](/content/u1m045108u430465/xxlarge1103.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) , ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![yacy](/content/u1m045108u430465/xxlarge1103.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) , ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![shchcy](/content/u1m045108u430465/xxlarge1097.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![yucy](/content/u1m045108u430465/xxlarge1102.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) : ![yucy](/content/u1m045108u430465/xxlarge1102.gif) ![zhcy](/content/u1m045108u430465/xxlarge1078.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![ycy](/content/u1m045108u430465/xxlarge1099.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![yucy](/content/u1m045108u430465/xxlarge1102.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![shchcy](/content/u1m045108u430465/xxlarge1097.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![ecy](/content/u1m045108u430465/xxlarge1101.gif) ![tcy](/content/u1m045108u430465/xxlarge1090.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![mcy](/content/u1m045108u430465/xxlarge1084.gif) ![vcy](/content/u1m045108u430465/xxlarge1074.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![dcy](/content/u1m045108u430465/xxlarge1076.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![lcy](/content/u1m045108u430465/xxlarge1083.gif) ![softcy](/content/u1m045108u430465/xxlarge1100.gif) ![scy](/content/u1m045108u430465/xxlarge1089.gif) ![kcy](/content/u1m045108u430465/xxlarge1082.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![ocy](/content/u1m045108u430465/xxlarge1086.gif) ![bcy](/content/u1m045108u430465/xxlarge1073.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![iecy](/content/u1m045108u430465/xxlarge1077.gif) ![zhcy](/content/u1m045108u430465/xxlarge1078.gif) ![softcy](/content/u1m045108u430465/xxlarge1100.gif) ![yucy](/content/u1m045108u430465/xxlarge1102.gif) ![gcy](/content/u1m045108u430465/xxlarge1075.gif) ![ncy](/content/u1m045108u430465/xxlarge1085.gif) ![zcy](/content/u1m045108u430465/xxlarge1079.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![pcy](/content/u1m045108u430465/xxlarge1087.gif) ![acy](/content/u1m045108u430465/xxlarge1072.gif) ![Acy](/content/u1m045108u430465/xxlarge1040.gif) ![fcy](/content/u1m045108u430465/xxlarge1092.gif) ![rcy](/content/u1m045108u430465/xxlarge1088.gif) ![icy](/content/u1m045108u430465/xxlarge1080.gif) ![kcy](/content/u1m045108u430465/xxlarge1082.gif) .
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