The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin)
In the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of the most proximal succession of the north-facing Gondwana platform. This study presents preliminary results related to the c. 200 m-thick Lower Sandstones and overlying Bedo Formation, which ess...
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Académie des sciences
2023-01-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.180/ |
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| author | Ghienne, Jean-François Moussa, Abderamane Saad, Abakar Djatibeye, Barnabé Youssouf, Hissein Mahamat |
| author_facet | Ghienne, Jean-François Moussa, Abderamane Saad, Abakar Djatibeye, Barnabé Youssouf, Hissein Mahamat |
| author_sort | Ghienne, Jean-François |
| collection | DOAJ |
| description | In the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of the most proximal succession of the north-facing Gondwana platform. This study presents preliminary results related to the c. 200 m-thick Lower Sandstones and overlying Bedo Formation, which essentially record Early to Middle Ordovician flooding events and the end-Ordovician glaciation and subsequent deglaciation. In the Lower Sandstones, fluvial-dominated deposits (prevailing cross-stratification, NW to NNE paleocurrent trends) include intervening high-frequency marine incursions (tidal deposits, ichnofacies including Cruziana and Arthrophycus). Above an erosional unconformity, the end-Ordovician glacial record consists of fluvioglacial conglomeratic deposits atop the Lower Sandstones, which are in turn superimposed by the fine-grained Bedo Formation. The latter interval, onlapping an exhumed erosion surface showing north-trending km-scale glacial lineations, shows glaciomarine deposits only at its base and possibly include Lower Silurian deposits in its upper part. |
| format | Article |
| id | doaj-art-c0343a9584ec4295a609b539c10e960d |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-c0343a9584ec4295a609b539c10e960d2025-02-07T10:39:55ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252023-01-01355G1638410.5802/crgeos.18010.5802/crgeos.180The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin)Ghienne, Jean-François0https://orcid.org/0000-0002-9448-5285Moussa, Abderamane1Saad, Abakar2Djatibeye, Barnabé3Youssouf, Hissein Mahamat4Institut Terre et Environnement de Strasbourg, UMR7063, CNRS – Université de Strasbourg, 5, rue R. Descartes, 67000 Strasbourg, FranceLaboratoire Hydro-Géosciences and Réservoirs, Département de Géologie et Paléontologie, Université de N’Djamena, BP 1027, N’Djamena, ChadLaboratoire Hydro-Géosciences and Réservoirs, Département de Géologie et Paléontologie, Université de N’Djamena, BP 1027, N’Djamena, ChadLaboratoire Hydro-Géosciences and Réservoirs, Département de Géologie et Paléontologie, Université de N’Djamena, BP 1027, N’Djamena, ChadMinistère du Pétrole du Chad, N’Djamena, ChadIn the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of the most proximal succession of the north-facing Gondwana platform. This study presents preliminary results related to the c. 200 m-thick Lower Sandstones and overlying Bedo Formation, which essentially record Early to Middle Ordovician flooding events and the end-Ordovician glaciation and subsequent deglaciation. In the Lower Sandstones, fluvial-dominated deposits (prevailing cross-stratification, NW to NNE paleocurrent trends) include intervening high-frequency marine incursions (tidal deposits, ichnofacies including Cruziana and Arthrophycus). Above an erosional unconformity, the end-Ordovician glacial record consists of fluvioglacial conglomeratic deposits atop the Lower Sandstones, which are in turn superimposed by the fine-grained Bedo Formation. The latter interval, onlapping an exhumed erosion surface showing north-trending km-scale glacial lineations, shows glaciomarine deposits only at its base and possibly include Lower Silurian deposits in its upper part.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.180/Erdi BasinPalaeozoicAfricaGlaciationSandstone |
| spellingShingle | Ghienne, Jean-François Moussa, Abderamane Saad, Abakar Djatibeye, Barnabé Youssouf, Hissein Mahamat The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) Comptes Rendus. Géoscience Erdi Basin Palaeozoic Africa Glaciation Sandstone |
| title | The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) |
| title_full | The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) |
| title_fullStr | The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) |
| title_full_unstemmed | The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) |
| title_short | The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin) |
| title_sort | ordovician strata of the ennedi plateau northeastern chad erdi basin |
| topic | Erdi Basin Palaeozoic Africa Glaciation Sandstone |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.180/ |
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