Southernmost outcrops of marine lower Tertiary carbonate rocks in NE-Africa (Gebel Abyad,Sudan) |
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Authors: | Dr Nabil Barazi Dr Jochen Kuss |
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Institution: | (1) Present address: Sonderforschungsbereich 69, TU-Berlin, Ackerstra\e 71-76, 1000 Berlin 65;(2) Present address: Institut für Geologie und Paläontologie, Technische Universität Berlin, Ernst-Reuter-Platz 1, 1000 Berlin 10, West Germany |
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Abstract: | Early Tertiary carbonates (Gebel Abyad Formation) are described from an isolated limestone plateau from the northwestern Sudan. They represent the southernmost outskirts of marine, Tertiary sediments in northeast Africa, which can be connected with transgressive/regressive cycles of the Tethys onto the African craton. Microfacies studies of the carbonates yielded exclusively shallow marine sediments which dried up temporarily, and with changing rates of terrigenous input. They contain a low diverse fauna and flora, poor in individuals. The paleogeographic reconstruction of this isolated occurrence was possible by comparing sediments from southern Egypt.
Zusammenfassung Aus dem nordwestlichen Sudan werden alttertiäre Karbonate (Gebel Abyad Formation) beschrieben, die ein isoliertes Vorkommen darstellen. Diese repräsentieren die südlichsten marinen tertiären Ablagerungen in Nordost-Afrika, die mit transgressiv/regressiven Zyklen der Tethys auf den afrikanischen Kraton in Verbindung gebracht werden können. Die mikrofaziell bearbeiteten Kalke stellen ausschlie\lich flachmarine Ablagerungen dar, mit Anzeichen für zeitweiliges Trockenfallen, und wechselnden Anteilen terrigener Zufuhr. Sie enthalten eine gering-diverse, individuenarme Fauna und Flora. Faziell vergleichbare Ablagerungen in Südägypten lassen eine Rekonstruktion dieses isolierten Kalkvorkommens zu einem paläogeographischen Modell zu.
Résumé Cette note décrit des roches carbonatées d'âge tertiaire inférieur (formation du Jebel Abyad) qui font partie d'un plateau isolé dans le nord-ouest du Soudan. Elles représentent l'extension méridionale maximale de la sédimentation marine tertiaire dans le nord-est de l'Afrique, sédimentation qui peut Être reliée aux cycles de transgressionsrégressions de la Téthys sur le bloc continental africain. L'étude des microfacies amène à les identifier comme des dépÔts marins de faible profondeur, temporairement asséchés et mÊlés d'apports terrigènes en quantité variable. Ils renferment une flore et une faune pauvres en espèces et en individus. La comparaison avec des sédiments du Sud égyptien permet de les intégrer dans un modèle paléogéographique.
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![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Mcy](/content/l42575565g7w6246/xxlarge1052.gif) ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![CHcy](/content/l42575565g7w6246/xxlarge1063.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![gcy](/content/l42575565g7w6246/xxlarge1075.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![ycy](/content/l42575565g7w6246/xxlarge1099.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![ycy](/content/l42575565g7w6246/xxlarge1099.gif) ![khcy](/content/l42575565g7w6246/xxlarge1093.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![Mcy](/content/l42575565g7w6246/xxlarge1052.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![ycy](/content/l42575565g7w6246/xxlarge1099.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) . ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![khcy](/content/l42575565g7w6246/xxlarge1093.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![softcy](/content/l42575565g7w6246/xxlarge1100.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![softcy](/content/l42575565g7w6246/xxlarge1100.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![ycy](/content/l42575565g7w6246/xxlarge1099.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![Fcy](/content/l42575565g7w6246/xxlarge1060.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Ucy](/content/l42575565g7w6246/xxlarge1059.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Fcy](/content/l42575565g7w6246/xxlarge1060.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) . ![IOcy](/content/l42575565g7w6246/xxlarge1025.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Fcy](/content/l42575565g7w6246/xxlarge1060.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![tscy](/content/l42575565g7w6246/xxlarge1094.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Mcy](/content/l42575565g7w6246/xxlarge1052.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![tscy](/content/l42575565g7w6246/xxlarge1094.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Ucy](/content/l42575565g7w6246/xxlarge1059.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![gcy](/content/l42575565g7w6246/xxlarge1075.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![gcy](/content/l42575565g7w6246/xxlarge1075.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) , ![CHcy](/content/l42575565g7w6246/xxlarge1063.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![shcy](/content/l42575565g7w6246/xxlarge1096.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![pcy](/content/l42575565g7w6246/xxlarge1087.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![gcy](/content/l42575565g7w6246/xxlarge1075.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Fcy](/content/l42575565g7w6246/xxlarge1060.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![CHcy](/content/l42575565g7w6246/xxlarge1063.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Ucy](/content/l42575565g7w6246/xxlarge1059.gif) ![Mcy](/content/l42575565g7w6246/xxlarge1052.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Dcy](/content/l42575565g7w6246/xxlarge1044.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Rcy](/content/l42575565g7w6246/xxlarge1056.gif) ![Ucy](/content/l42575565g7w6246/xxlarge1059.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![tscy](/content/l42575565g7w6246/xxlarge1094.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Acy](/content/l42575565g7w6246/xxlarge1040.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![scy](/content/l42575565g7w6246/xxlarge1089.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![softcy](/content/l42575565g7w6246/xxlarge1100.gif) ![kcy](/content/l42575565g7w6246/xxlarge1082.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![Vcy](/content/l42575565g7w6246/xxlarge1042.gif) ![ycy](/content/l42575565g7w6246/xxlarge1099.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![tcy](/content/l42575565g7w6246/xxlarge1090.gif) ![lcy](/content/l42575565g7w6246/xxlarge1083.gif) ![Ocy](/content/l42575565g7w6246/xxlarge1054.gif) ![zhcy](/content/l42575565g7w6246/xxlarge1078.gif) ![IEcy](/content/l42575565g7w6246/xxlarge1045.gif) ![Ncy](/content/l42575565g7w6246/xxlarge1053.gif) ![Icy](/content/l42575565g7w6246/xxlarge1048.gif) .
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本文献已被 SpringerLink 等数据库收录! |
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